Exhibit 4.2


 


THIS CONVERTIBLE PROMISSORY NOTE HAS BEEN, AND ANY SHARES
ISSUED UPON CONVERSION PURSUANT TO THE TERMS HEREOF WILL BE, ACQUIRED FOR INVESTMENT AND NOT WITH A VIEW TO, OR FOR SALE IN CONNECTION
WITH, ANY DISTRIBUTION THEREOF WITHIN THE MEANING OF THE SECURITIES ACT OF 1933, AS AMENDED (THE "ACT"). THIS CONVERTIBLE
PROMISSORY NOTE, AND ANY SECURITIES ISSUED UPON CONVERSION PURSUANT TO THIS NOTE, HAVE NOT BEEN REGISTERED UNDER THE ACT OR ANY
STATE SECURITIES LAW, AND MAY BE OFFERED AND SOLD ONLY IF REGISTERED PURSUANT TO THE PROVISIONS OF THE ACT OR THOSE LAWS OR IF
AN EXEMPTION FROM REGISTRATION IS AVAILABLE. 


 


SUBORDINATED CONVERTIBLE PROMISSORY
NOTE


 


THIS NOTE IS ISSUED IN SUBSTITUTION FOR,
AND SUPERSEDES, THE ORIGINAL NOTE DATED OCTOBER 31, 2003 AND ALL NOTES SUBSEQUENTLY ISSUED TO EXTEND THE ORIGINAL TERM.


 





	Principal Amount:	$1,500,000	March 9, 2018




 


FOR VALUE RECEIVED,
INRAD OPTICS, INC. (FORMERLY PHOTONIC PRODUCTS GROUP INC., AND INRAD, INC.), a New Jersey corporation (hereinafter called "Issuer"),
hereby promises to pay to the order of CLAREX, LTD. and its successors and assigns (hereinafter called the "Holder"),
at such address as the Holder may designate in writing to Issuer, the principal sum of ONE MILLION DOLLARS FIVE HUNDRED THOUSAND
($1,500,000) plus all accrued interest owing hereunder in lawful money of the United States of America on or before the Maturity
Date (as defined below), unless this Convertible Promissory Note (the "Note") is converted by the Holder as set forth
herein. For purposes of this Note, "Maturity Date" shall mean April 1, 2021.


 


1. Interest. Interest
shall accrue on the unpaid principal amount of this Note at the rate of six percent (6%) per annum and shall be due and payable
on the Maturity Date. Interest shall be computed on the basis of a 360 day year for the actual number of days elapsed.


 


2. Optional Prepayment;
Order of Payments.  Issuer may prepay this Note at any time, in whole or in part, without premium or penalty; provided, however,
Issuer shall provide to the Holder written notice at least ten (10) business days prior to such prepayment. All payments made on
account of this Note shall be applied first to the payment of any costs of enforcement then due hereunder, second to the payment
of accrued and unpaid interest then due hereunder, and the remainder, if any, shall be applied to the unpaid principal balance
of this Note.


 


3. Event of Default
Defined; Acceleration of Maturity. If one or more of the following events ("Events of Default") shall have occurred:


 


(a)        a
default in the payment of all or any part of the principal or interest due under this Note as and when the same shall become due
and payable, at maturity, by declaration as permitted hereunder, upon acceleration or otherwise;


 






     


     


    

 


(b)        Issuer
shall merge or consolidate with or into any other person or entity, sell, transfer, lease or otherwise dispose of all or any substantial
portion of its assets or adopt a plan of liquidation or dissolution; provided, however, that Issuer shall have the
right to merge with any other entity so long as Issuer shall be the surviving entity in any such merger;


 


(c)        Issuer
shall have applied for or consented to the appointment of a custodian, receiver, trustee or liquidator, or other court-appointed
fiduciary of all or a substantial part of its properties; or a custodian, receiver, trustee or liquidator or other court appointed
fiduciary shall have been appointed with the consent of Issuer; or Issuer is generally not paying its debts as they become due
or is insolvent, or has made a general assignment for the benefits of its creditors; or Issuer files a voluntary petition in bankruptcy,
or a petition or an answer seeking reorganization or an arrangement with its creditors or seeking to take advantage of any insolvency
law, or an answer admitting the material allegations of a petition in any bankruptcy, reorganization or insolvency proceeding or
has taken action for the purpose of effecting any of the foregoing; or if, within sixty (60) days after the commencement of any
proceeding against Issuer seeking any reorganization, rehabilitation, arrangement, composition, readjustment, liquidation, dissolution
or similar relief under the Federal bankruptcy code or similar order under future similar legislation, the appointment of any trustee,
receiver, custodian, liquidator, or other court-appointed fiduciary of Issuer or of all or any substantial part of its properties,
such order or appointment shall not have been vacated or stayed on appeal or if, within sixty (60) days after the expiration of
any such stay, such order or appointment shall not have been vacated (all such events, collectively "Insolvency Events");


 


Then Holder, by notice in writing to Issuer
(the "Acceleration Notice"), may declare the principal amount of this Note and all accrued but unpaid interest to be
due and payable immediately, and upon any such declaration the same shall become immediately due and payable; provided that if
an Insolvency Event occurs, the principal amount of this Note and all accrued but unpaid interest shall become and be immediately
due and payable without any declaration or other act on the part of the Holder.


 


4. Conversion.
The Holder may, at any time prior to the earlier of the Maturity Date or the prepayment of this Note by Issuer, convert all or
a portion of the principal and accrued interest then outstanding under this Note into one Unit for each dollar converted (or an
aggregate of 1,500,000 Units, exclusive of accrued interest) with each Unit consisting of one fully paid and non-assessable share
of Issuer’s Common Stock (the "Common Stock") and one Warrant in the form of Exhibit A hereto to acquire 0.75 shares
of Issuer’s Common Stock at a price of $1.35 up to April 1, 2024 (i.e. if this Note were converted in full, for principal
amount other than accrued interest, the Holder would receive 1,500,000 shares of Common Stock and 1,125,000 Warrants). Such conversion
shall be effected by the Holder by sending a written notice of conversion and this Note to Issuer for cancellation and issuance
of the number of shares of Common Stock and Warrants into which this Note is being converted. In the event this Note is being converted
in part, a replacement Note representing the unconverted portion of this Note shall be delivered to the Holder. Upon conversion
of this Note, only whole shares of Common Stock shall be issued. Any remainder due hereunder which is insufficient to purchase
a whole share of Common Stock shall be paid by Issuer in cash.


 






    	 	-2-	 



     


    

 


4.1       Subdivision
or Combination of Common Stock. In case Issuer shall at any time subdivide (by any stock split, stock dividend or otherwise)
its outstanding shares of Common Stock into a greater number of shares, the Conversion Price in effect immediately prior to such
subdivision shall be proportionately reduced, and, conversely, in case the outstanding shares of Common Stock shall be combined
into a smaller number of shares, the Conversion Price in effect immediately prior to such combination shall be proportionately
increased.


 


4.2       Reorganization
or Reclassification. If any capital reorganization or reclassification of the capital stock of Issuer (other than in connection
with a merger or other reorganization in which Issuer is not the surviving entity) shall be effected in such a way that holders
of Common Stock shall be entitled to receive stock, securities or assets with respect to or in exchange for Common Stock, then,
as a condition of such reorganization or reclassification, lawful and adequate provisions shall be made whereby the Holder shall
thereupon have the right to receive upon the conversion of this Note, upon the terms and conditions specified herein and in lieu
of the shares of Common Stock immediately theretofore receivable upon the conversion of this Note, such shares of stock, securities
or assets as may be issued or payable with respect to or in exchange for the shares of Common Stock immediately theretofore receivable
upon such conversion had such reorganization or reclassification not taken place, and in any such case appropriate provisions shall
be made with respect to the rights and interests of the Holder to the end that the provisions hereof shall thereafter be applicable,
as nearly as may be, in relation to any shares of stock, securities or assets thereafter deliverable upon the exercise of such
conversion rights.


 


4.3       Notice
of Adjustment. Upon any adjustment of the Conversion Price, then and in each such case Issuer shall give written notice thereof,
by delivery in person, certified or registered mail, return receipt requested, telecopier or telex, addressed to the Holder at
the address of the Holder, as provided to Issuer, which notice shall state the Conversion Price resulting from such adjustment,
setting forth in reasonable detail the method upon which such calculation is based.


 


4.4       Due
Issuance of Shares Upon Conversion. Issuer covenants and agrees that all shares of Common Stock or any such other securities
which may be issued upon any whole or partial conversion of this Note will, upon issuance, be validly issued, fully paid and non-assessable
and free from all taxes, liens and charges with respect to the issue thereof.


 


4.5       Stock
to be Reserved. Issuer will at all times reserve and keep available out of its authorized Common Stock, solely for the purpose
of issuance upon the conversion of this Note as herein provided, such number of shares of Common Stock as shall then be issuable
upon the conversion hereof. Issuer will not take any action which results in any adjustment of the Conversion Price if the total
number of shares of Common Stock issued and issuable after such action upon conversion of this Note would, when added to the number
of shares of Common Stock then reserved for issuance, exceed the total number of shares of Common Stock then authorized by Issuer’s
Certificate of Incorporation.


 


5.Subordination.
The Issuer hereby agrees, and the Holder of this Note by its acceptance agrees, that the payment of the principal of and interest
on the Note is hereby expressly made subordinate and junior in right of payment, to the extent set forth in the following paragraphs
(a), (b) and (c), to the prior payment in full of all Senior Debt of the Issuer, whether such Senior Debt, except as provided in
Section 5 below, is incurred prior to, on or after the date hereof:


 






    	 	-3-	 



     


    

 


(a)       In
the event of insolvency or bankruptcy proceedings, or any receivership, liquidation, reorganization or other similar proceedings
relative to the Issuer or to any of the property of the Issuer, or in the event or any proceedings for voluntary liquidation, dissolution,
or other winding-up of the Issuer, whether or not involving insolvency or bankruptcy, then the holders of Senior Debt shall be
entitled to receive payment in full of all principal of and interest on all Senior Debt before the Holder of this Note shall be
entitled to receive any payment on account of principal or interest on this Note, and to that end the holders of Senior Debt shall
be entitled to receive for application in payment thereof any payment or distribution of any kind or character, whether in cash
or property or securities, which may be payable or deliverable in any such proceedings in respect of this Note.


 


(b)       In
the event that this Note is declared due and payable prior to its stated maturity, by reason of the occurrence of an Event of Default
hereunder (under circumstances when the provisions of the foregoing paragraph (a) shall not be applicable), then all principal
of and interest on all Senior Debt outstanding at the time of such declaration shall first be paid in full, before any payment
on account of principal or interest is made upon this Note.


 


(c)       The
Issuer may make payments and, subject to Section 1 of this Note, prepayments of the principal of and interest of this Note if,
at the time of the payment and immediately after giving effect thereto, (i) there exists no default in any payment with respect
to any Senior Debt and (ii) there shall not have occurred an event of default (other than a default in the payment of amounts due
thereon) with respect to any Senior Debt, as defined in the instrument under which the same is outstanding, permitting the holders
thereof to accelerate the maturity thereof, other than an event of default which shall have been cured or waived or shall have
ceased to exist. Should the Holder of this Note, while there exists a default or an event of default as provided in the immediately
preceding sentence, and after being notified by the holder of the Senior Debt of the default, receive any such payment, or should
the Holder of this Note receive any distribution in bankruptcy, dissolution, or similar insolvency proceedings in regard to the
Issuer, the Holder of the Note will hold such payment or distribution in trust for the holder of the Senior Debt and will pay over
such amounts to such holder to apply to the Senior Debt until the same is paid in full.


 


The provisions of this
Section 5 are for the purpose of defining the relative rights of the holders of Senior Debt and the Holder of the Note against
the Issuer and its property. Nothing herein shall impair, as between the Issuer and the Holder of this Note, the obligation of
the Issuer, which is unconditional and absolute, to pay to the Holder the principal and interest in accordance with the terms and
the provisions hereof; nor shall anything herein prevent the Holder of this Note from exercising all remedies otherwise permitted
by applicable law or hereunder upon default under this Note, subject to the rights, if any, under this Section 5 of holders of
Senior Debt to receive cash, property, stock or obligation otherwise payable or deliverable to the Holder of this Note. The Issuer
acknowledges and agrees that the rights of the Holder of this Note with respect to the Issuer’s cash, property, rights and
other assets of any kind are senior and prior to the rights of any holder of capital stock of the Issuer arising from such capital
stock.


 






    	 	-4-	 



     


    

 


(d)    Definition.
 “Senior Debt” shall mean the principal of, interest on and, if applicable, any premium on (i) the
debt of the Issuer outstanding as of the date hereof, (ii) additional indebtedness incurred by the Issuer after date hereof
for money borrowed from a bank, savings and loan association trust Issuer, insurance Issuer or similar financial institution, (iii) purchase
money secured debt, (iv) obligations of the Issuer as lessee under leases of real or personal property which are treated as capital
lease obligations under generally accepted accounting principles, and (v) any deferrals, renewals, re-financings or extensions
of any of the foregoing.


 


6.       Miscellaneous.


 


6.1       Binding
Effect; Assignability. This Note shall be binding upon Issuer, its successors and its assigns, and shall inure to the benefit
of Holder, its successors and its assigns. This Note is transferable or assignable by the Holder or any transferee of the Holder
only to an Affiliate or a partner, or an heir, administrator, executor or successor of the Holder; provided that such transfer
or assignment is made in compliance with the Act and any applicable state and foreign securities laws.


 


6.2       Governing
Law; Jurisdiction; Venue. This Note has been executed in and shall be governed by the laws of the State of New Jersey. Issuer
irrevocably submits to the exclusive jurisdiction of the courts of the State of New Jersey which will be the exclusive jurisdiction
for disputes arising under the Note and the United States District Court for the District of New Jersey for the purpose of any
suit, action, proceeding or judgment relating to or arising out of this Note.


 


IN WITNESS WHEREOF,
Issuer has caused this Note to be signed in its name by its duly authorized officer and its corporate seal to be affixed hereto.


 








	 	 	INRAD OPTICS, INC.	 	 	 
	 	 	 	 	 	 
	 	 	 	 	
         

        /s/ William J. Foote
	 	 	 
	 	 	 	By:	 	 	 
	 	 	 	 	William J. Foote,	 	 	 
	 	 	 	Chief Financial Officer, Secretary and Treasurer	 
	 	 	 	 	 	 	 	 
	 	 	 	 	 	 	 	 


 


	 	Acknowledged and accepted on behalf of CLAREX, LTD	 
	 	 	 	 	 	 	 	 



 






	 	By:		 	Date:	12th
    April 2018	 







 




 





	 	By:		 	Date:	12th April 2018	 









 



    	 	-5-