Document:

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                                                                   EXHIBIT 10.14

                                LOAN AGREEMENT

                               No. LA-201003/01

This Agreement is made on this day 3rd October, 2000 by and between

                           IPG Photonics Corporation

A Delaware Corporation registered to do business in Massachusetts and whose
Registered Office is 560 Main Street, Sturbridge MA 01566 U.S.A. hereinafter
referred to as the "LENDER",

And

                                NTO "IRE-POLUS"

A Russian Society with a Limited Responsibility registered to do business in
Fryazino, Moscow Region and whose Registered Office is Vvedenskogo Sq. l,
Fryazino, 141120 Russia hereinafter referred to as the "BORROWER",

Whereas:

The BORROWER is a research & development and manufacturing company operating in
the field of fiber optics communications and laser technology incorporated under
Russian Law, and is willing to enter into long term co-operation with the LENDER
and its affiliates in accordance with but not limited to the Assignment and
Research and Development Agreement signed between the LENDER and the BORROWER on
the 30th August 2000 and any other agreements for the supply of products,
research and development, technical assistance, capital equipment and any other
services that the BORROWER and its affiliates might from time to time enter into
with the LENDER.

Whereas:

The LENDER is a laser and fiber-optic equipment manufacturing company
incorporated under the Laws of the State of Delaware, USA, and is willing to
enter into long term co-operation with the BORROWER in accordance with but not
limited to the Assignment and Research and Development Agreement signed between
the LENDER and the BORROWER on the 30th August 2000 and any other agreements for
the purchase of products, research and development, technical assistance,
capital equipment and other services that the BORROWER might from time to time
enter into with the LENDER and its affiliates.
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NOW THEREFORE IT IS MUTUALLY AGREED AS FOLLOWS:

1.  SUBJECT OF THIS AGREEMENT

    1.1.  The LENDER hereby agrees to advance to the BORROWER the sum of USD
          1,000,000 (one million USD). The sum will be advanced to the BORROWER
          in two equal installments each of USD 500,000 (USD five hundred
          thousand) payable.

2.  USE OF PROCEEDS

    2.1.  The proceeds of the loan are to be used to acquire machinery and
          capital equipment to be used in research and development and the
          supply of components, products and equipment to the IPG Group in
          accordance with but not limited to the Assignment and Research and
          Development Agreement signed between the IPG Group and the Borrower on
          the 24th August 2000 and any other agreements that the IPG Group and
          the Borrower might from time to time enter into.

3.  TERMS OF PAYMENT

    3.1.  The payment of USD 1,000,000,- shall be made by the LENDER to the
          BORROWER'S account as per the following telegraphic transfer
          instructions:

          Bankers Trust Company
          New York, USA
          SWIFT Code: BKTRUS33
          Account No.: 04-405-953
          Beneficiary: Federal Bank of Innovations and Development
          Moscow, Russia
          For final credit to Account No.: 4070284040000007007
          Beneficiary: NTO "IRE-Polus" Co

    3.2.  The loan shall be drawn down as follows:

          500,000 USD amounting to 50% of the Loan

          The LENDER shall transfer USD 500,000 (five hundred thousands USD) to
          the BORROWER as per the payment instructions given above with value
          date 5th October 2000.

          500,000 USD amounting to 50% of the Loan

          The LENDER shall transfer USD 500,000 (Five Hundreds Thousands USD) to
          the BORROWER as per the payment instructions given above and as
          mutually agreed but in any event not later than 15th January 2001. The
          transfer is to be executed within 10 days of the BORROWER'S request
          for funds.
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4.  TERMS AND CONDITIONS OF THE LOAN

    4.1.  The Loan is unsecured.
    4.2.  Interest shall accrue on the principal at 7.00% being the current
          Federal Funds Rate of 6.50% plus a spread of 0.50%. This rate shall be
          fixed for the term of the loan.
    4.3.  Interest shall be calculated on the date that the Loan falls due on
          the basis of the number of days that loan has been drawn down in
          proportion to 365.
    4.4.  Interest is payable in cash on the date that the Loan falls due.

5.  REPAYMENT

    5.1.  The term of the loan is for six months from the date that the LENDER
          transfers the funds to the BORROWER such period being determined from
          the date on which the BORROWER draws down the first portion of the
          loan.

    5.2.  BORROWER may repay any capital sum and interest accrued thereon up to
          the date of repayment at any time before the expiry of the Loan
          subject to informing the LENDER in writing such intention and any such
          repayment of amounts due shall constitute the fulfillment of the
          BORROWER'S obligations and the fulfillment of LENDER'S rights under
          the agreement.

    5.3.  At the mutual agreement of both parties the loan may be converted into
          authorized but Unissued Common Stock of the BORROWER at a rate to be
          determined and agreed by the parties at the time of such conversion on
          or before the due date of the loan.

    5.4.  The repayment of any capital or interest accrued thereon shall be made
          by the BORROWER to the LENDER'S account as per the following transfer
          instructions:

          FirstMass Bank N.A.
          370 Main Street
          Worcester, MA 01608
          United States of America
          ABU Number: 211370545
          Account No.: 8029308942
          Beneficiary: IPG Phonics Corporation

    5.5.  To the extent that the LENDER owes the BORROWER any monies due under
          any other agreement between the LENDER and the BORROWER, the BORROWER
          may offset such amounts as are mutually agreed between the parties
          against the principal of the Loan and accrued interest accrued thereon
          by written notice to the LENDER to that effect.
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6.  DEFAULT PROVISIONS

    6.1.  Upon the occurrence of any of the following events, the entire unpaid
          principal balance of this Loan, together with all accrued interest,
          shall become immediately due and payable, and the LENDER shall be
          entitled to pursue all remedies which it may have, at law or in
          equity, for the enforcement and collection of the principal and
          accrued interest:

          6.1.1  The failure of the BORROWER to make any payment of interest or
                 principal when due on this Loan; or

          6.1.2. Any other default by the BORROWER in the payment or performance
                 of its obligations under this Loan, if such default is not
                 fully remedied within ten days after notice of such default is
                 given to the BORROWER.

7.  NOTICES

    7.1.  All notices, requests, demands or other communications to be given by
          either party to the other pursuant to this Agreement shall be in
          writing and in the English language and sent by telex, electronic
          mail, cable or registered mail, postage prepaid to the addresses in
          the introduction to this agreement.

8.  VALIDITY OF THE CONTRACT

    8.1.  This Loan and all representations, warranties, covenants and
          agreements contained herein, shall be binding upon the Borrower and
          its successors and permitted assigns and shall inure to the benefit of
          the LENDER and its successors, endorsees and assigns. The BORROWER may
          not assign or delegate any of its duties and or obligations under this
          Loan.

    8.2.  This Contract is valid for a period of six (6) months, such period
          being determined from the date on which the first portion of the loan
          is drawn down by the BORROWER and shall expire on the earlier of the
          completion of the period detailed above or the date of repayment of
          the Loan by the Borrower to the LENDER.

    8.3.  At the mutual agreement of both the LENDER and the BORROWER the term
          of this agreement and the Loan governed hereunder may be extended from
          time to time as is deemed appropriate.

    8.4.  This Loan Agreement and the rights and obligations hereunder shall be
          governed by and construed in accordance with the laws of the State of
          New York applicable to contracts entered into and be performed within
          said State. This Contract has been drawn in two (2) English / Russian
          Copies and has been duly signed by Parties concerned under the date
          herein above stated.
<PAGE>

FOR IPG Photonics Corporation

/s/ Dr. Timothy P.V. Mammen
------------------------------------

FOR NTO IRE-Polus:

/s/ Dr. Valentin P. Gapontsev
------------------------------------<PAGE>

                                                                   EXHIBIT 10.15

                            FORM OF NON-COMPETITION
                            ------------------------
                     AND CONFIRMATORY ASSIGNMENT AGREEMENT
                     -------------------------------------

     This NON-COMPETITION, CONFIDENTIALITY AND CONFIRMATORY ASSIGNMENT AGREEMENT
(the "Agreement") is made and entered into as of August __, 2000 by and among
[IPG Photonics Corporation, a Delaware corporation] (the "Company") and
[insert name of executive  ], an individual residing at [  insert address of
---------------------------                             --------------------
executive  ] (the "Executive").  Reference is made to that certain Stock
-----------
Purchase Agreement of the date herewith (the "Purchase Agreement"), which
contemplates an investment in the Company by the investors named therein (the
"Investors").

                                  WITNESSETH
                                  ----------

     WHEREAS, the Executive holds a direct equity interest in the Company;

     WHEREAS, the Company is a manufacturer of fiber amplifiers, fiber lasers
and associated products.  The Company's business is conducted throughout the
world and the reputation and goodwill of the Company are an integral part of its
business success;

     WHEREAS, as a material inducement to the Investors to enter into the
Purchase Agreement and in consideration of the covenants and agreements set
forth therein, and in order to provide the Investors with the full benefits of
their investment, the Executive has agreed to execute and deliver this
Agreement; and

     WHEREAS, the execution and delivery by the Executive of this Agreement is a
condition precedent to the Company's willingness to consummate the transactions
described in the Purchase Agreement.

     NOW, THEREFORE, in consideration of the mutual promises and covenants set
forth herein, the receipt and sufficiency of which are hereby acknowledged, the
parties hereto, intending to be legally bound, agree as follows:

     Section 1.  Non-Competition; Non-Solicitation.  In view of the fact that
     ---------   ---------------------------------
any activity of the Executive in violation of the terms hereof would adversely
affect the Company and its subsidiaries (as defined below) and would deprive the
Investors under the Purchase Agreement of the benefits of their bargains
thereunder, and to preserve the goodwill associated with the Company's business,
the Executive hereby agrees to the following restrictions on his activities:

          (a)  Non-Competition.  The Executive hereby agrees that during the
               ---------------
period commencing on the date hereof and ending on the date which is the later
of (i) two (2) years after the date hereof and (ii) one (1) year after the date
on which the Executive's employment with the Company and its subsidiaries
terminates for any reason (the "Non-Competition Period") , he will not, without
the express written consent of the Company, directly or indirectly (including
without limitation through his involvement with IPG Laser Components, a German

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corporation, NEO-IPG Co., a Russian corporation or [IP Canada, Inc.], a Canadian
corporation) anywhere in the world, engage in any activity which is, or
participate or invest in, or provide or facilitate the provision of financing
to, or assist (whether as owner, part-owner, shareholder, member, partner,
director, officer, trustee, employee, agent or consultant, or in any other
capacity), any business, organization or person other than the Company (or any
subsidiary of the Company), and including any such business, organization or
person involving, or which is, a family member of the Executive, whose business,
activities, products or services are competitive with any of the business,
activities, products or services conducted or offered by the Company and its
subsidiaries during any period in which the Executive serves as an officer or
employee of the Company or any of its subsidiaries, which business, activities,
products and services shall include in any event and without limitation the
business of manufacturing and testing of fiber amplifiers and fiber lasers and
related products[provided, however, [Russian carve out]. The Executive hereby
acknowledges that, because of the global-based nature of the Company's business,
the geographic scope as set forth above is reasonable.

     (b)  Non-Solicitation.  The Executive hereby agrees that during the period
          ----------------
commencing on the date hereof and ending on the date which is the later of (i)
two (2) years after the date hereof and (ii) eighteen (18) months after the date
on which the Executive's employment with the Company and its subsidiaries
terminates for any reason, he will not, without the express written consent of
the Company, (a) hire or engage or attempt to hire or engage for or on behalf of
himself or any such competitor any officer or employee of the Company or any of
its subsidiaries, or any former employee of the Company and any of its
subsidiaries who was employed during the one (1) year period immediately
preceding the date on which the Executive's employment or service relationship
with the Company was terminated for any reason, (b) encourage for or on behalf
of himself or any such competitor any such officer or employee to terminate his
or her relationship or employment with the Company or any of its subsidiaries,
(c) solicit for or on behalf of himself or any such competitor any client of the
Company or any of its subsidiaries or (d) divert to any person (as hereinafter
defined) any client or business opportunity of the Company or any of any of its
subsidiaries.

     The Board of Directors, with prior notice and adequate disclosure of any
opportunity or proposed activity, shall be entitled to interpret the provisions
of this Agreement and exempt any opportunity or activity of the Executive which
the Board of Directors, in its reasonable judgment, believes is in the interests
of, or not opposed to the interests of, the Company.

     Notwithstanding anything herein to the contrary, the Executive may make
passive investments in any enterprise the shares of which are publicly traded if
such investment constitutes less than three percent (3%) of the equity of such
enterprise.

     Neither the Executive nor any business entity controlled by him is a party
to any contract, commitment, arrangement or agreement which could, following the
date hereof, restrain or restrict the Company or any subsidiary of the Company
from carrying on its business or restrain or restrict the Executive from
performing his employment obligations, and as of the date of this Agreement the
Executive has no business interests whatsoever in or relating to the industries
in which the Company and its subsidiaries currently engage other than his
interest in the Company and other than interests in public companies of less
than one percent (1%).

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     For purposes of this Agreement, any reference to the subsidiaries of the
Company shall be deemed to include all entities directly or indirectly
controlled by it through an ownership of more than fifty percent (50%) of the
voting interests.  As used in this Agreement, the term "person" shall mean an
individual, a corporation, an association, a partnership, a limited liability
company, an estate, a trust, and any other entity or organization.

     The Executive agrees that the Company may, at its option, enforce the non-
competition and non-solicitation provisions of this Section 1 by making any
compensation payments required to be made to the Executive as required by
applicable laws.

     Section 2.  Scope of Agreement.  The parties acknowledge that the time,
     ---------   ------------------
scope, geographic area and other provisions of this Agreement have been
specifically negotiated by sophisticated commercial parties and agree that (a)
all such provisions are reasonable under the circumstances of the transactions
contemplated hereby, (b) are given as an integral and essential part of the
transactions contemplated hereby and (c) but for the covenants of the Executive
contained in this Agreement, the Company and the Investors would not have
entered into or consummated the transactions contemplated hereby.  The Executive
has independently consulted with his counsel and has been advised in all
respects concerning the reasonableness and propriety of the covenants contained
herein, with specific regard to the business to be conducted by Company and its
subsidiaries, and represents that the Agreement is intended to be, and shall be,
fully enforceable and effective in accordance with its terms.

     Section 3.  Acknowledgement Regarding Inventions/Receipt of Fair
     ---------   ----------------------------------------------------
Compensation.  Executive hereby confirms, acknowledges and agrees that all
------------
inventions, modifications, discoveries, designs, developments, improvements,
processes, know-how, or intellectual property rights whatsoever (collectively,
"Developments") that he (either along or with others) has conceived, made or
reduced to practice at any time or times while employed by the Company or any of
its subsidiaries that:

     (a)  related to fixtures for and methods of manufacture of fiber amplifiers
          and certain aspects of fiber amplifiers,
     (b)  related from tasks assigned to the Executive by the Company or any of
          its subsidiaries to the business, or
     (c)  resulted from the use of premises or personal property (whether
          tangible or intangible owned, leased or contracted for or by the
          Company or any of its subsidiaries

are the sole and absolute property of the Company, its successors and assigns.
The employee acknowledges that all Developments were made as a "work for hire"
and all proprietary rights which the Executive may have acquired in such
Developments were assigned to the Company.  The Executive hereby acknowledges he
has not created any Developments that do not satisfy the provisions of Section
3(a), (b) or (c).  Executive hereby confirms, acknowledges and agrees that he
has received mutually-agreed upon compensation from the Company in consideration
for the

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<PAGE>

Company's ownership rights to the Developments set forth in this Section 3 and
that such consideration is fair and reasonable.

     Section 4.  Certain Remedies; Severability.  It is specifically understood
     ---------   ------------------------------
and agreed that any breach of the provisions of this Agreement by the Executive
or any of his affiliates will result in irreparable injury to the Company and
its subsidiaries, that the remedy at law alone will be an inadequate remedy for
such breach and that, in addition to any other remedy it may have, the Company
and upon authorization by the Board of Directors of the Company its subsidiaries
shall be entitled to enforce the specific performance of this Agreement by the
Executive through both temporary and permanent injunctive relief without the
necessity of proving actual damages, but without limitation of their right to
damages and any and all other remedies available to them, it being understood
that injunctive relief is in addition to, and not in lieu of, such other
remedies.  In the event that any covenant contained in this Agreement shall be
determined by any court of competent jurisdiction to be unenforceable by reason
of its extending for too great a period of time or over too great a geographical
area or by reason of its being too extensive in any other respect, it shall be
interpreted to extend only over the maximum period of time for which it may be
enforceable and/or over the maximum geographical area as to which it may be
enforceable and/or to the maximum extent in all other respects as to which it
may be enforceable, all as determined by such court in such action.  The
existence of any claim or cause of action which the Executive may have against
the Company or any of its subsidiaries shall not constitute a defense or bar to
the enforcement of any of the provisions of this Agreement.  Executive agrees
that he will not assert, and it should not be considered, that any provision
contained in this Agreement prevents him from earning a living or is otherwise
void, voidable, or unenforceable or should be voided or held to be
unenforceable.

     Section 5.  Jurisdiction.  The parties hereby irrevocably submit to the
     ---------   ------------
non-exclusive jurisdiction of the courts of The Commonwealth of Massachusetts to
construe and enforce the covenants contained in this Agreement.  In the event
that the courts of any state shall hold such covenants unenforceable (in whole
or in part) by reason of the breadth of such scope or otherwise, it is the
intention of the parties hereto that such determination shall not bar or in any
way affect the right of the Company or upon authorization by the Board of
Directors of the Company any its subsidiaries to the relief provided for herein
in the courts of any other state within the geographic scope of such covenants,
as to breaches of such covenants in such other respective states, the above
covenants as they relate to each state being, for this purpose, severable into
diverse and independent covenants.

     Section 6.  Notices.  Any notice or demand which is required or provided to
     ---------   -------
be given under this Agreement shall be deemed to have been sufficiently given
and received for all purposes when delivered by hand, telecopy, telex or other
method of facsimile, or five days after being sent by certified or registered
mail, postage and charges prepaid, return receipt requested, or two days after
being sent by overnight delivery providing receipt of delivery, to the following
addresses:  if to the Company, P.O. Box 519, 660 Main Street, Sturbridge, MA
01566, Facsimile:  508-347-6838, Attn: [  insert name or title of officer  ],
                                          ---------------------------------
or at any other address designated by the Company to each Investor and the
Executive in writing; if to the Executive, [  insert address and facsimile
                                            ------------------------------
number  ], or at any other address designated by the Executive to the Company
--------
and the Investors in writing; if to the Investors, c/o TA Associates,

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<PAGE>

Inc., 20 Willow Road, Suite 100, Menlo Park, CA 94025, Facsimile: (650) 326-
4933, Attn: Michael C. Child, or at any other address designated by the
Investors to the Company and the Executive in writing.

     Section 7.  Miscellaneous.  This Agreement shall be governed by and
     ---------   --------------
construed under the laws of The Commonwealth of Massachusetts and shall not be
modified or discharged in whole or in part except by an agreement in writing
signed by the Company and the Executive.  The failure of any of the parties to
require the performance of a term or obligation or to exercise any right under
this Agreement or the waiver of any breach hereunder shall not prevent
subsequent enforcement of such term or obligation or exercise of such right or
the enforcement at any time of any other right hereunder or be deemed a waiver
of any subsequent breach of the provision so breached, or of any other breach
hereunder.  This Agreement shall inure to the benefit of, and be binding upon,
successors of the Company by way of merger, consolidation or transfer of
substantially all the assets of the Company, and may not be assigned by the
Executive.  This Agreement supersedes all prior understandings and agreements
between the parties relating to the subject matter hereof.

     Section 8.  Third Party Beneficiaries. The parties hereto acknowledge and
                 -------------------------
agree that the Investors are third party beneficiaries of this Agreement.

                 [REMAINDER OF PAGE INTENTIONALLY LEFT BLANK]

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<PAGE>

     IN WITNESS WHEREOF, the parties have executed this Non-Competition
Agreement under seal as of the date first set forth above.

                              COMPANY:

                              IPG PHOTONICS CORPORATION.

                              By:______________________________________
                                 Name:
                                 Title:

                              EXECUTIVE:

                              _________________________________________
                              Name:

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