Document:

<PAGE>

                                                                 Exhibit 10.5(a)

                                November 17, 2000

Optune Technologies
3949 Ashby
Saint Laurent, Quebec H4R 2K3

Gentlemen:

      StockerYale, Inc. ("StockerYale") hereby subscribes for 490 common shares
without nominal or par value (the "Shares") in the share capital of Optune
Technologies, Inc., a corporation (the "Company") incorporated pursuant to the
Companies Act (Quebec) on October 12, 2000, in consideration of StockerYale's
agreement to contribute to the Company an aggregate of $4,000,000, such
contribution to be made at the times and in the amounts set forth on Exhibit A
hereto, as contemplated in the Optune Technologies, Inc. Business Plan (Rev. 2)
dated August 22, 2000. StockerYale is entering into this letter agreement in
reliance on the fact that, concurrently with the execution of this letter
agreement, Nicolae Miron has executed a separate letter agreement with the
Company, pursuant to which he has subscribed for 510 shares in the share capital
of the Company.

                                    Very truly yours,

                                    STOCKERYALE, INC.

                                    By: /s/ Gary B. Godin
                                       ----------------------------------------
                                       Name: Gary B. Godin
                                       Title: Chief Financial Officer

ACKNOWLEDGED AND AGREED:

OPTUNE TECHNOLOGIES, INC.

By: /s/ Alain Beauregard
    --------------------------
     Name: Alain Beauregard
     Title:  Chairman
<PAGE>

                                    Exhibit A

<TABLE>
<CAPTION>
---------------------------------------------------------------------------------------------------
             [Upon
             Signing] 1/1/01   4/1/01   7/1/01    10/1/01  1/1/02   4/1/02   7/1/02     10/1/02
---------------------------------------------------------------------------------------------------
<S>          <C>      <C>      <C>      <C>       <C>      <C>      <C>      <C>        <C>
StockerYale  $684,147 $108,900 $117,250 $368,288  $193,000 $263,700 $847,300 $1,003,650 $413,765
Contribution
---------------------------------------------------------------------------------------------------
                                                                             TOTAL      $4,000,000
---------------------------------------------------------------------------------------------------
</TABLE>

All dollar amounts above are in US$.<PAGE>

                                                                 Exhibit 10.5(b)

                             STOCKHOLDERS AGREEMENT

                                  By and Among

                            Optune Technologies, Inc.

                                StockerYale, Inc.

                                       and

                                  Nicolae Miron

                          Dated as of November17, 2000
<PAGE>

                                TABLE OF CONTENTS

                                                                            Page

ARTICLE I.     DEFINITIONS...................................................1
  Section 1.01 Defined Terms.................................................1

ARTICLE II.    REPRESENTATIONS AND WARRANTIES................................2
  Section 2.01 Representations and Warranties of the Stockholders............2
  Section 2.02 Representations and Warranties of the Company.................3

ARTICLE III.   RESTRICTIONS ON TRANSFER; RIGHT OF REFUSAL; CO-SALE
               PROVISIONS....................................................3
  Section 3.01 Restrictions on Transfer......................................3
  Section 3.02 Permitted Transfers...........................................3
  Section 3.03 Right of Refusal..............................................4
  Section 3.04 Co-Sale Option................................................6
  Section 3.05 Contemporaneous Transfers.....................................8
  Section 3.06 Assignment....................................................8
  Section 3.07 Effect of Prohibited Transfers................................8

ARTICLE IV.    ELECTION OF DIRECTORS.........................................8
  Section 4.01 Board Composition.............................................8
  Section 4.02 Removal; Vacancies............................................8
  Section 4.03 Assignment....................................................9

ARTICLE V.     COVENANTS OF THE COMPANY......................................9
  Section 5.01 Prohibited Actions............................................9

ARTICLE VI.    MISCELLANEOUS PROVISIONS.....................................10
  Section 6.01 Survival of Covenants........................................10
  Section 6.02 Legend on Securities.........................................10
  Section 6.03 Amendment and Waiver; Actions of the Board...................10
  Section 6.04 Notices......................................................10
  Section 6.05 Headings.....................................................11
  Section 6.06 Counterparts.................................................11
  Section 6.07 Remedies; Severability.......................................11
  Section 6.08 Entire Agreement.............................................11
  Section 6.09 Adjustments..................................................12
  Section 6.10 Law Governing................................................12
  Section 6.11 Successors and Assigns.......................................12

Schedule A..-     Stockholders

Exhibit A ..-     Form of Joinder Agreement
<PAGE>

                             STOCKHOLDERS AGREEMENT

      THIS STOCKHOLDERS AGREEMENT (the "Agreement") is made as of this 17th day
of November, 2000, by and among Optune Technologies, Inc, a Quebec corporation
(the "Company"), StockerYale, Inc., a Massachusetts corporation ("StockerYale"),
Nicolae Miron, ("Miron") and any other stockholder or option holder who from
time to time becomes party to this Agreement by execution of a Joinder Agreement
in substantially the form attached hereto as Exhibit A (together with
StockerYale and Miron, the "Stockholders," and each individually, a
"Stockholder").

      WHEREAS, the Stockholders hold shares of the Company's common stock, no
par value per share (the "Common Stock") in the amounts set forth in Schedule A
of this Agreement;

      WHEREAS, the parties hereto desire to agree upon the terms on which the
securities of the Company, now or hereafter outstanding and held by them, will
be held, transferred and voted and to agree upon certain other matters regarding
the operation of the Company's business.

      NOW, THEREFORE, in consideration of the foregoing and the mutual covenants
and agreements hereinafter set forth, the parties hereto agree as follows:

ARTICLE I. DEFINITIONS

      Section 1.01 Defined Terms. The following capitalized terms, as used in
this Agreement, shall have the meanings set forth below.

      An "Affiliate" of any Person means a Person that, directly or indirectly,
through one or more intermediaries, controls, is controlled by or is under
common control with the first mentioned Person. A Person shall be deemed to
control another Person if such first Person possesses, directly or indirectly,
the power to direct, or cause the direction of, the management and policies of
the second Person, whether through the ownership of voting securities, by
contract or otherwise.

      "Board of Directors" means the Board of Directors of the Company.

      "Charter" means Company's Certificate of Incorporation

      "Common Stock" means the Common Stock and any other common equity
securities issued by the Company, and any other shares of stock issued or
issuable with respect thereto (whether by way of a stock dividend or stock split
or in exchange for or upon conversion of such shares or otherwise in connection
with a combination of shares, recapitalization, merger, consolidation or other
corporate reorganization).

      "Company" shall mean Optune Technologies, Inc., a Quebec corporation and
any successors thereto.
<PAGE>

      "Person" means an individual, a corporation, an association, a joint
venture, a partnership, a limited liability company, an estate, a trust, an
unincorporated organization and any other entity or organization, governmental
or otherwise.

      "Qualified Public Offering" means the Company's first underwritten public
offering pursuant to an effective registration statement under the Securities
Act of 1933, as amended, or the equivalent securities legislation in Canada
provided that (i) such registration statement covers the offer and sale of
Common Stock of which the aggregate gross proceeds attributable to sales for the
account of the Company exceed US$20 million, at a price per share equal to at
least US$5,000 (appropriately adjusted for any stock split, combination,
reorganization, recapitalization, stock dividend, or similar event) and (ii)
such Common Stock is listed for trading on any of the New York Stock Exchange,
the Toronto Stock Exchange or the NASDAQ National Market.

      "Shares" means, at any time, shares of (i) Common Stock and (ii) any other
equity securities now or hereafter issued by the Company, together with any
options thereon and any other shares of stock issued or issuable with respect
thereto (whether by way of a stock dividend, stock split or in exchange for or
upon conversion of such shares or otherwise in connection with a combination of
shares, recapitalization, merger, consolidation or other corporate
reorganization).

      "Technology" means the tunable optical filter and all related intellectual
property described in the Optune Technologies, Inc. Business Plan (Rev. 2) dated
August 22, 2000.

      "Transfer" means any direct or indirect transfer, donation, sale,
assignment, pledge, hypothecation, grant of a security interest in or other
disposal or attempted disposal of all or any portion of a security, any interest
or rights in a security, or any rights under this Agreement. "Transferred" means
the accomplishment of a Transfer, and "Transferee" means the recipient of a
Transfer.

ARTICLE II. REPRESENTATIONS AND WARRANTIES

      Section 2.01 Representations and Warranties of the Stockholders. Each of
the Stockholders, individually and not jointly, hereby represents, warrants and
covenants to the Company and the other Stockholders as follows: (a) such
Stockholder has full authority, power and capacity to enter into this Agreement;
(b) this Agreement constitutes the valid and binding obligation of such
Stockholder enforceable against him in accordance with its terms, except: (i) as
limited by applicable bankruptcy, insolvency, reorganization, moratorium and
other laws of general application affecting enforcement of creditors' rights
generally, (ii) as limited by laws relating to the availability of specific
performance, injunctive relief, or other equitable remedies, and (iii) to the
extent the indemnification provisions may be limited by applicable Canadian or
U.S. federal, provincial or state securities laws; and (c) the execution,
delivery and performance by such Stockholder of this Agreement: (i) does not and
will not violate any existing laws, rules or regulations of the United States,
Canada or any state or province or other jurisdiction applicable to such
Stockholder, or require such Stockholder to obtain any approval, consent or
waiver of, or to make any filing with, any Person that has not been obtained or
made; and (ii) does not and will not result in a breach of, constitute a default
under, accelerate any obligation

                                        2
<PAGE>

under or give rise to a right of termination of any existing indenture or loan
or credit agreement or any other material agreement, contract, instrument,
mortgage, lien, lease, permit, authorization, order, writ, judgment, injunction,
decree, determination or arbitration award to which such Stockholder is a party
or by which the property of such Stockholder is bound or affected, or result in
the creation or imposition of any mortgage, pledge, lien, security interest or
other charge or encumbrance on any of the assets or properties of such
Stockholder.

      Section 2.02 Representations and Warranties of the Company. The Company
hereby represents, warrants and covenants to the Stockholders as follows: (a)
the Company has full corporate authority and power to enter into this Agreement;
(b) this Agreement constitutes the valid and binding obligation of the Company
enforceable against it in accordance with its terms, except: (i) as limited by
applicable bankruptcy, insolvency, reorganization, moratorium and other laws of
general application affecting enforcement of creditors' rights generally, (ii)
as limited by laws relating to the availability of specific performance,
injunctive relief, or other equitable remedies, and (iii) to the extent the
indemnification provisions may be limited by applicable federal or state
securities laws; and (c) the execution, delivery and performance by the Company
of this Agreement: (i) does not and will not violate any laws, rules or
regulations of the United States or any state or other jurisdiction applicable
to the Company, or require the Company to obtain any approval, consent or waiver
of, or to make any filing with, any Person that has not been obtained or made;
and (ii) does not and will not result in a breach of, constitute a default
under, accelerate any obligation under or give rise to a right of termination of
any indenture or loan or credit agreement or any other material agreement,
contract, instrument, mortgage, lien, lease, permit, authorization, order, writ,
judgment, injunction, decree, determination or arbitration award to which the
Company is a party or by which the property of the Company is bound or affected,
or result in the creation or imposition of any mortgage, pledge, lien, security
interest or other charge or encumbrance on any of the assets or properties of
the Company.

ARTICLE III. RESTRICTIONS ON TRANSFER; RIGHT OF REFUSAL; CO-SALE PROVISIONS

      The following provisions of this Article III shall terminate immediately
upon, and shall not apply with respect to, a Qualified Public Offering.

      Section 3.01 Restrictions on Transfer. Each Stockholder agrees that he,
she or it will not, without the prior written consent of a majority-in-interest
of the other Stockholders; i.e., determined without inclusion of the Stockholder
desiring to transfer his, hers or its Shares, Transfer all or any portion of the
Shares now owned or hereafter acquired by him, her or it, except in connection
with, and strictly in compliance with the conditions of this Article III.

      Section 3.02 Permitted Transfers. Notwithstanding anything herein to the
contrary, the provisions of Sections 3.03 and 3.04 shall not apply to any of the
Transfers listed below, provided that in each case the Transferee shall have
entered into a Joinder Agreement in substantially the form attached hereto as
Exhibit A providing that all Shares so Transferred shall continue to be subject
to all provisions of this Agreement as if such Shares were still held by such
Stockholder, except that no further Transfer shall thereafter be permitted
hereunder except in compliance with Sections 3.03 and 3.04:

                                        3
<PAGE>

            (a) Transfers by any Stockholder to the spouse, children or siblings
      of such Stockholder or to a trust or family limited partnership for the
      benefit of any of them;

            (b) Transfers upon the death of any Stockholder to such
      Stockholder's heirs, executors or administrators or to a trust under such
      Stockholder's will, or Transfers between such Stockholder and such
      Stockholder's guardian or conservator; and

            (c) If the Stockholder is a corporation, to a wholly-owned
      subsidiary.

Notwithstanding anything to the contrary in this Agreement or any failure by a
Transferee under this Section 3.02 to execute a Joinder Agreement, such
Transferee shall take any Shares so Transferred subject to all provisions of
this Agreement as if such Shares were still held by the Stockholder making such
Transfer, whether or not they so agree in writing.

      Section 3.03 Right of Refusal. In the event that any Stockholder
entertains a bona fide offer to purchase all or any portion of the Shares held
by such Stockholder (a "Transaction Offer") from any other Person (a "Buyer"),
such Stockholder (a "Transferring Stockholder") may, subject to the provisions
of Section 3.04 hereof, Transfer such Shares pursuant to and in accordance with
the following provisions of this Section 3.03:

            (a) Offer Notice. The Transferring Stockholder shall cause the
      Transaction Offer and all of the terms thereof to be reduced to writing
      and shall promptly notify the Company and each of the other Stockholders
      (the "Offeree Stockholders") of such Transferring Stockholder's desire to
      effect the Transaction Offer and otherwise comply with the provisions of
      this Section 3.03 and, if applicable, Section 3.04 (such notice, the
      "Offer Notice"). The Transferring Stockholder's Offer Notice shall
      constitute an irrevocable offer to sell all or any portion of the Shares
      which are the subject of the Transaction Offer (the "Offered Shares") to
      the Company and the Offeree Stockholders, on the basis described below, at
      a purchase price equal to the price contained in, and on the same terms
      and conditions as, the Transaction Offer. The Offer Notice shall be
      accompanied by a true copy of the Transaction Offer (which shall identify
      the Buyer and all relevant information in connection therewith).

            (b) Company Option. The Company shall have the first option to
      purchase all of the Offered Shares. At any time within ten (10) days after
      receipt by the Company of the Offer Notice (the "Company Option Period"),
      the Company may elect to accept the offer to purchase with respect to all
      of the Offered Shares and shall give written notice of such election (the
      "Company Acceptance Notice") to the Transferring Stockholder within the
      Company Option Period. The Company Acceptance Notice shall constitute a
      valid, legally binding and enforceable agreement for the sale and purchase
      of the Shares. If the Company accepts the offer to purchase all of the
      Offered Shares, the closing for such purchase of the Offered Shares by the
      Company under this Section 3.03(b) shall take place within thirty (30)
      days following the expiration of the Company Option Period, at the offices
      of the Company or on such other date or at such other place as may be
      agreed to by the Transferring Stockholder and the Company. If the Company
      fails to purchase the Offered Shares by exercising its option under this
      Section 3.03(b) within the period provided, the Transferring Stockholder
      shall so notify the Offeree Stockholders promptly

                                        4
<PAGE>

      (the "Additional Offer Notice"), which Additional Offer Notice shall
      identify the Offered Shares that the Company has failed to purchase (the
      "Rejected Shares"). The Rejected Shares shall be subject to the options
      granted to the Offeree Stockholders pursuant to Section 3.03(c) below.

            (c) Stockholders Option. If the Company fails to purchase the
      Offered Shares under Section 3.03(b) above, at any time within ten (10)
      days after receipt by the Offeree Stockholders of the Additional Offer
      Notice (the "Stockholder Option Period"), each Offeree Stockholder may
      elect to accept the offer to purchase with respect to any or all of the
      Rejected Shares and shall give written notice of such election (the
      "Stockholder Acceptance Notice") to the Transferring Stockholder and each
      other Offeree Stockholder within the Stockholder Option Period, which
      notice shall indicate the maximum number of Shares that the Stockholder is
      willing to purchase, including the number of Shares it would purchase if
      one or more other Stockholders do not elect to purchase their Pro Rata
      Fractions (as defined in paragraph (d) below). The Stockholder Acceptance
      Notice shall constitute a valid, legally binding and enforceable agreement
      for the sale and purchase of the Shares covered by the Stockholder
      Acceptance Notice. The closing for any purchase of Shares by the Offeree
      Stockholders under this Section 3.03(c) (along with the purchase by the
      Company of any Shares under paragraph (b) above if the Company is
      purchasing less than all of the Offered Shares) shall take place within
      thirty (30) days following the expiration of Stockholder Option Period, at
      the offices of the Company or on such other date or at such other place as
      may be agreed to by the Transferring Stockholder and the purchasing
      Offeree Stockholders. The Transferring Offeree Stockholder shall notify
      the Offeree Stockholders promptly if any Offeree Stockholder fails to
      offer to purchase all of its Pro Rata Fraction.

            (d) Allocation of Shares among Offeree Stockholders. Upon the
      expiration of the Offeree Stockholder Option Period, the number of Shares
      to be purchased by each Offeree Stockholder shall be determined as
      follows: (i) first, there shall be allocated to each Offeree Stockholder
      electing to purchase, a number of Shares equal to the lesser of (A) the
      number of Shares as to which such Stockholder accepted as set forth in its
      respective Offeree Stockholder Acceptance Notice or (B) such Offeree
      Stockholder's Pro Rata Fraction (as defined below), and (ii) second, the
      balance, if any, not allocated under clause (i) above, shall be allocated
      to those Offeree Stockholders who within the Stockholder Option Period
      delivered a Stockholder Acceptance Notice that set forth a number of
      Shares that exceeded their respective Pro Rata Fractions, in each case on
      a pro rata basis in proportion to the number of Shares held by each such
      Offeree Stockholder up to the amount of such excess. An Offeree
      Stockholder's Pro Rata Fraction shall be equal to the product obtained by
      multiplying the total number of Rejected Shares by a fraction, the
      numerator of which is the total number of Shares owned by such Offeree
      Stockholder, and the denominator of which is the total number of Shares
      held by all Offeree Stockholders, in each case as of the date of the Offer
      Notice.

            (e) Valuation of Property. In the event that the price set forth in
      the Offer Notice is stated in consideration other than cash or cash
      equivalents, the Board of Directors of the Company shall determine the
      fair market value of such consideration, reasonably and in good faith, and
      the Company and/or the Offeree Stockholders, as the

                                        5
<PAGE>

      case may be, may effect their purchase under this Section 3.03 by payment
      of such fair market value in cash or cash equivalents.

            (f) Sale to Third Party. In the event that the Company and the
      Offeree Stockholders do not elect to exercise the rights to purchase under
      this Section 3.03 with respect to all of the Shares proposed to be sold,
      the Transferring Stockholder may sell all such Shares to the Buyer on the
      terms and conditions set forth in the Offer Notice, subject to the
      provisions of Section 3.04. If the Transferring Stockholder's sale to a
      Buyer is not consummated in accordance with the terms of the Transaction
      Offer on or before sixty (60) calendar days after the latest of: (i) the
      expiration of the Company Option Period, (ii) the expiration of the
      Stockholder Option Period, (iii) the expiration of the Co-Sale Election
      Period set forth in Section 3.04 below, if applicable, and (iv) the
      satisfaction of all governmental approval or filing requirements, the
      Transaction Offer shall be deemed to lapse, and any Transfers of Shares
      pursuant to such Transaction Offer shall be in violation of the provisions
      of this Agreement unless the Transferring Stockholder sends a new Offer
      Notice and once again complies with the provisions of this Section 3.03
      with respect to such Transaction Offer.

      Section 3.04 Co-Sale Option . In the event that the Company and the
Offeree Stockholders do not exercise their rights under Section 3.03 with
respect to all of the Shares proposed to be so Transferred in connection with
any Transaction Offer, the Transferring Stockholder may Transfer such Shares
only pursuant to and in accordance with the following provisions of this Section
3.04:

            (a) Co-Sale Notice. As soon as practicable following the expiration
      of the Stockholder Option Period, and in no event later than five (5) days
      thereafter, the Transferring Stockholder shall provide notice to each
      Offeree Stockholder (the "Co-Sale Notice") of its right to participate in
      the Transaction Offer on a pro rata basis with the Transferring
      Stockholder (the "Co-Sale Option"). To the extent one or more Offeree
      Stockholders exercise their Co-Sale Option in accordance with this Section
      3.04, the number of Shares that the Transferring Stockholder may Transfer
      in the Transaction Offer shall be correspondingly reduced.

            (b) Acceptance. Each of the Offeree Stockholders shall have the
      right to exercise its Co-Sale Option by giving written notice of such
      intent to participate (the "Co-Sale Acceptance Notice") to the
      Transferring Stockholder within ten (10) days after receipt by such
      Offeree Stockholder of the Co-Sale Notice (the "Co-Sale Election Period").
      Each Co-Sale Acceptance Notice shall indicate the maximum number of Shares
      subject thereto which the Offeree Stockholder wishes to sell, including
      the number of Shares it would sell if one or more other Offeree
      Stockholders do not elect to participate in the sale on the terms and
      conditions stated in the Offer Notice.

            (c) Allocation of Shares. Each Offeree Stockholder shall have the
      right to sell a portion of its Shares pursuant to the Transaction Offer
      which is equal to or less than the product obtained by multiplying the
      total number of Shares available for sale to the Buyer subject to the
      Transaction Offer by a fraction, the numerator of which is the total
      number of Shares owned by such Offeree Stockholder and the denominator of
      which is the total

                                        6
<PAGE>

      number of Shares held by all Stockholders (including the Transferring
      Stockholder), in each case as of the date of the Offer Notice, subject to
      increase as hereinafter provided. In the event any Offeree Stockholder
      does not elect to sell the full amount of such Shares which such Offeree
      Stockholder is entitled to sell pursuant to this Section 3.04, then any
      Offeree Stockholders who have elected to sell Shares shall have the right
      to sell, on a pro-rata basis (based on the number of Shares held by each
      such Offeree Stockholder) with any other Offeree Stockholders and up to
      the maximum number of Shares stated in each such Stockholder's Co-Sale
      Acceptance Notice, any Shares not elected to be sold by such Offeree
      Stockholder.

            (d) Co-Sale Closing. Within ten (10) calendar days after the end of
      the Co-Sale Election Period, the Transferring Stockholder shall promptly
      notify each participating Offeree Stockholder of the number of Shares held
      by such Offeree Stockholder that will be included in the sale and the date
      on which the Transaction Offer will be consummated, which shall be no
      later than the later of (i) thirty (30) calendar days after the end of the
      Co-Sale Election Period and (ii) the satisfaction of any governmental
      approval or filing requirements, if any. Each participating Stockholder
      may effect its participation in any Transaction Offer hereunder by
      delivery to the Buyer, or to the Transferring Stockholder for delivery to
      the Buyer, of one or more instruments or certificates, properly endorsed
      for transfer, representing the Shares it elects to sell pursuant thereto.
      At the time of consummation of the Transaction Offer, the Buyer shall
      remit directly to each participating Stockholder that portion of the sale
      proceeds to which the participating Stockholder is entitled by reason of
      its participation with respect thereto. No Shares may be purchased by the
      Buyer from the Transferring Stockholder unless the Buyer simultaneously
      purchases from the participating Stockholders all of the Shares that they
      have elected to sell pursuant to this Section 3.04.

            (e) Liability of Stockholders. Each participating Offeree
      Stockholder shall be liable to the Buyer only to same extent as the
      Transferring Stockholder with respect to representations and warranties
      regarding the Company or its business, on a several basis for each such
      Offeree Stockholder's pro rata portion, provided that each such
      Stockholder's liability with respect to such representations and
      warranties shall not exceed the value of the proceeds received by such
      Offeree Stockholder upon the consummation of the Transaction Offer and,
      provided further, that no Offeree Stockholder shall be required to make
      any other representations or warranties or to provide any indemnities in
      connection therewith other than with respect to title to the shares being
      conveyed.

            (f) Sale to Third Party. Any Shares held by a Transferring
      Stockholder that are the subject of the Transaction Offer and that the
      Transferring Stockholder desires to Transfer following compliance with
      this Section 3.04, may be sold to the Buyer only during the period
      specified in Section 3.04(d) and only on terms no more favorable to the
      Transferring Stockholder than those contained in the Offer Notice.
      Promptly after such Transfer, the Transferring Stockholder shall notify
      the Company, which in turn shall promptly notify all the other
      Stockholders, of the consummation thereof and shall furnish such evidence
      of the completion and time of completion of the Transfer and of the terms
      thereof as may reasonably be requested. Prior to the effectiveness of any
      Transfer to a

                                        7
<PAGE>

      Buyer hereunder, such Buyer shall have entered into a Joinder Agreement in
      substantially the form attached hereto as Exhibit A, and such Buyer shall
      have all the rights and obligations hereunder as if such Buyer were a
      Stockholder. In the event that the Transaction Offer is not consummated
      within the period required by this Section 3.04 or the Buyer fails timely
      to remit to each participating Stockholder its respective portion of the
      sale proceeds, the Transaction Offer shall be deemed to lapse, and any
      Transfer of Shares pursuant to such Transaction Offer shall be in
      violation of the provisions of this Agreement unless the Transferring
      Stockholder sends a new Offer Notice and once again complies with the
      provisions of Sections 3.03 and 3.04 with respect to such Transaction
      Offer.

      Section 3.05 Contemporaneous Transfers. If two or more Stockholders
propose concurrent Transfers which are subject to this Article III, then the
relevant provisions of Sections 3.03 and 3.04, as applicable, shall apply
separately to each such proposed Transfer.

      Section 3.06 Assignment. Subject to Section 7.11 hereof, each Stockholder
shall have the right to assign its rights hereunder to any Transferee of such
Stockholder's Shares, and shall further have the right to assign and transfer
such Stockholder's right to accept any particular Transaction Offer, and any
such Transferee shall be deemed within the definition of a "Stockholder" for
purposes of this Article III.

      Section 3.07 Effect of Prohibited Transfers. If any Transfer is made or
attempted contrary to the provisions of this Agreement, such purported Transfer
shall be void ab initio; the Company and the other parties hereto shall have, in
addition to any other legal or equitable remedies which they may have, the right
to enforce the provisions of this Agreement by actions for specific performance
(to the extent permitted by law); and the Company shall have the right to refuse
to recognize any Transferee as one of its Stockholders for any purpose.

ARTICLE IV. ELECTION OF DIRECTORS

      The provisions of this Article IV shall terminate immediately upon the
closing of a Qualified Public Offering.

      Section 4.01 Board Composition. Each Stockholder agrees to vote all of
his, her or its Shares having voting power (and any other Shares over which he,
she or it exercises voting control), in connection with the election of
Directors and to take such other actions as are necessary so as to fix the
number of Directors at four (4) and to elect and continue in office as Directors
the following:

            (a) Three (3) Persons (each, a "StockerYale Nominee") nominated by
      StockerYale, which StockerYale Nominees shall initially be Mark W.
      Blodgett, Alain Beauregard and Lawrence W. Blodgett;

            (b) One (1) Person (the "Miron Nominee") nominated by Miron (for so
      long as he continues to own his shares, which Miron Nominee shall
      initially be Nicolae Miron.

      Section 4.02 Removal; Vacancies. Each Stockholder agrees to vote all of
its Shares having voting power (and any other Shares over which he, she or it
exercises voting control), for

                                        8
<PAGE>

the removal of any Director upon the request of the Persons then entitled to
nominate such Director as set forth in Section 4.01 above, and for the election
to the Board of Directors of a substitute designated by such party in accordance
with the provisions hereof. Each Stockholder further agrees to vote all of its
Shares having voting power (and any other Shares over which he, she or it
exercises voting control) in such manner as shall be necessary or appropriate to
ensure that any vacancy on the Board of Directors occurring for any reason shall
be filled only in accordance with the provisions of this Article IV.

      Section 4.03 Assignment. Each Stockholder agrees, as a condition to any
Transfer of its Shares, to cause the Transferee to agree to the provisions of
this Article IV, whereupon such Transferee shall be subject to the provisions
hereof to the same extent as the Stockholders in connection with its ownership
of the Shares Transferred.

ARTICLE V. COVENANTS OF THE COMPANY

      The Company covenants and agrees with each of the Stockholders that:

      Section 5.01 Prohibited Actions. Without the prior written consent of both
StockerYale and Miron, the Company shall not:

      (a) establish or alter the compensation payable or other material terms of
employment with respect to the Company's management or any of the members of the
Board of Directors of the Company, or adopt or amend any employee benefit plan
for employees or other key persons of the Company;

      (b) merge, consolidate or enter into any other business combination
transaction with any Person;

      (c) liquidate or dissolve the Company;

      (d) enter into any material commercial agreement relating to the
Technology, including, without limitation, distribution or marketing agreements,
licenses, or other similar agreements or enter into any agreement whatsoever in
which the Company transfers or assigns any ownership rights in the Technology or
grants an exclusive right to use any portion of the Technology;

      (e) authorize, issue, or obligate itself to issue any additional shares of
Common Stock of any class, or any other equity interest in the Company, or any
right, option, or warrant to purchase Common Stock or any securities of any type
whatsoever which are, or may become, convertible or exchangeable into Common
Stock;

      (f) (A) declare or set aside or pay any dividend or make any other
distribution or payment with respect to any shares of its capital stock, or (B)
directly or indirectly redeem, purchase or otherwise acquire any shares of their
capital stock or make any commitment for such action;

      (g) engage in any discussions relating to, make any proposal or offer
relating to, or

                                        9
<PAGE>

enter into any agreement with respect to, any acquisition or purchase by the
Company of all or a significant portion of the assets of, or any capital stock
or other equity interest in, any entity or otherwise relating to the acquisition
of material assets;

      (h) incur any indebtedness, guarantee the indebtedness of any other Person
or enter into any arrangement having the economic effect of a guarantee;

      (i) alter the funding schedule for the Company; or

      (j) enter into any agreement to do any of the foregoing.

ARTICLE VI. MISCELLANEOUS PROVISIONS

      Section 6.01 Survival of Covenants. Each of the parties hereto agrees that
each covenant and agreement made by it in this Agreement or in any certificate,
instrument or other document delivered pursuant to this Agreement is material,
shall be deemed to have been relied upon by the other parties and shall remain
operative and in full force and effect after the date hereof regardless of any
investigation. This Agreement shall not be construed so as to confer any right
or benefit upon any Person other than the parties hereto and their respective
successors and permitted assigns to the extent contemplated herein.

      Section 6.02 Legend on Securities. The Company and the Stockholders
acknowledge and agree that in addition to any other legend on the certificates
representing Shares held by them, substantially the following legend shall be
typed on each certificate evidencing any of the Shares held at any time by any
of the Stockholders:

THE SECURITIES REPRESENTED HEREBY ARE SUBJECT TO THE PROVISIONS OF A CERTAIN
STOCKHOLDERS AGREEMENT, DATED AS OF NOVEMBER 17TH, 2000, INCLUDING CERTAIN
RESTRICTIONS ON TRANSFER SET FORTH THEREIN. A COMPLETE AND CORRECT COPY OF SUCH
AGREEMENT IS AVAILABLE FOR INSPECTION AT THE PRINCIPAL OFFICE OF THE COMPANY AND
WILL BE FURNISHED UPON WRITTEN REQUEST AND WITHOUT CHARGE.

      Section 6.03 Amendment and Waiver; Actions of the Board. Any party may
waive any provision hereof intended for its benefit in writing. No failure or
delay on the part of any party hereto in exercising any right, power or remedy
hereunder shall operate as a waiver thereof. The remedies provided for herein
are cumulative and are not exclusive of any remedies that may be available to
any party hereto at law or in equity or otherwise. This Agreement may be amended
with the prior written consent of the Company and each of the Stockholders.

      Section 6.04 Notices. All notices and other communications provided for
herein shall be in writing and shall be deemed to have been duly given,
delivered and received (a) if delivered personally or (b) if sent by facsimile,
registered or certified mail (return receipt requested) postage prepaid, or by
courier guaranteeing next day delivery, in each case to the party to whom it is
directed, which if to the Company, shall be at 32 Hampshire Road, Salem, NH
03079, c/o the Chief Financial Officer, and if to any Stockholder or
Stockholder, at the addresses set forth below such party's signature hereto (or
at such other address for any party as shall be specified by notice given in
accordance with the provisions hereof, provided that notices

                                       10
<PAGE>

of a change of address shall be effective only upon receipt thereof). Notices
delivered personally shall be effective on the day so delivered, notices sent by
registered or certified mail shall be effective five days after mailing, notices
sent by facsimile shall be effective when receipt is acknowledged, and notices
sent by courier guaranteeing next day delivery shall be effective on the earlier
of the second business day after timely delivery to the courier or the day of
actual delivery by the courier.

      Section 6.05 Headings. The Article and Section headings used or contained
in this Agreement are for convenience of reference only and shall not affect the
construction of this Agreement. The parties have participated jointly in the
negotiation and drafting of this Agreement and the other agreements, documents
and instruments executed and delivered in connection herewith with counsel
sophisticated in investment transactions. In the event an ambiguity or question
of intent or interpretation arises, this Agreement and the agreements, documents
and instruments executed and delivered in connection herewith shall be construed
as if drafted jointly by the parties and no presumption or burden of proof shall
arise favoring or disfavoring any party by virtue of the authorship of any
provisions of this Agreement and the agreements, documents and instruments
executed and delivered in connection herewith.

      Section 6.06 Counterparts. This Agreement may be executed in one or more
counterparts and by the parties hereto in separate counterparts, each of which
when so executed shall be deemed to be an original and all of which together
shall be deemed to constitute one and the same agreement.

      Section 6.07 Remedies; Severability. It is specifically understood and
agreed that any breach of the provisions of this Agreement by any Person subject
hereto will result in irreparable injury to the other parties hereto, that the
remedy at law alone will be an inadequate remedy for such breach, and that, in
addition to any other legal or equitable remedies which they may have, such
other parties may enforce their respective rights by actions for specific
performance (to the extent permitted by law) and the Company may refuse to
recognize any unauthorized Transferee as one of its Stockholders for any
purpose, including, without limitation, for purposes of dividend and voting
rights, until the relevant party or parties have complied with all applicable
provisions of this Agreement.

      In the event that any one or more of the provisions contained herein, or
the application thereof in any circumstances, is held invalid, illegal or
unenforceable in any respect for any reason, the validity, legality and
enforceability of any such provision in every other respect and of the remaining
provisions contained herein shall not be in any way impaired thereby, it being
intended that all of the rights and privileges of the parties hereto shall be
enforceable to the fullest extent permitted by law.

      Section 6.08 Entire Agreement. This Agreement is intended by the parties
as a final expression of their agreement and intended to be complete and
exclusive statement of the agreement and understanding of the parties hereto in
respect of the subject matter contained herein.

                                       11
<PAGE>

      Section 6.09 Adjustments. All references to share prices and amounts
herein shall be equitably adjusted to reflect stock splits, stock dividends,
recapitalizations and similar changes affecting the capital stock of the
Company.

      Section 6.10 Law Governing. This Agreement shall be construed and enforced
in accordance with and governed by the laws of the Province of Quebec (without
giving effect to principles of conflicts of law).

      Section 6.11 Successors and Assigns. This Agreement shall be binding upon
and inure to the benefit of the respective successors and permitted assigns of
the parties hereto as contemplated herein, and any successor to the Company by
way of merger or otherwise shall specifically agree to be bound by the terms
hereof as a condition of such successor. The rights of the Stockholders
hereunder shall be assignable to Transferees of their Shares as contemplated
herein. This Agreement may not be assigned by any Stockholder except as provided
herein without the prior written consent of the Company and a Majority Interest,
and without such prior written consent any attempted Transfer shall be null and
void.

                            [SIGNATURE PAGE FOLLOWS]

                                       12
<PAGE>

      IN WITNESS WHEREOF, the parties hereto have caused this Stockholders
Agreement to be duly executed as of the date first set forth above.

THE COMPANY:
-----------
                                        OPTUNE TECHNOLOGIES, INC.

                                        By:  /s/ Alain Beauregard
                                             -----------------------------------
                                             Name: Alain Beauregard
                                             Title: Chairman

THE  STOCKHOLDERS:
-----------------
                                        STOCKERYALE, INC.

                                        By:  /s/ Gary B. Godin
                                             -----------------------------------
                                             Name: Gary B. Godin
                                             Title: Chief Financial Officer

                                        Address For Notice:

                                        32 Hampshire Road
                                        Salem, New Hampshire  03079
                                        Attn: Chief Executive Officer

                                        NICOLAE MIRON

                                        /s/ Nicolae Miron
                                        ----------------------------------------

                                        Address For Notice:

                                        ---------------------------------------

                                        ---------------------------------------

                                        ---------------------------------------

                                        ---------------------------------------

                                        ---------------------------------------
<PAGE>

                                    EXHIBIT A

                            Form of Joinder Agreement

      The undersigned hereby agrees, effective as of the date hereof, to become
a party to that certain Stockholders Agreement (the "Agreement") dated as of
November 17th, 2000, by and among Optune Technologies,. Inc. (the "Company") and
the parties named therein and for all purposes of the Agreement, the undersigned
shall be included within the term "Stockholder" (as defined in the Agreement).
The address and facsimile number to which notices may be sent to the undersigned
is as follows:

Dated:_______________________
                                        ----------------------------------------
                                        [NAME OF UNDERSIGNED]

                                        Address For Notice:

                                        ---------------------------------------

                                        ---------------------------------------

                                        ---------------------------------------
                                        Facsimile No. __________________________
                                        ----------------------------------------

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