REVOLVING CREDIT NOTE

FOR VALUE RECEIVED, the undersigned, IPG PHOTONICS CORPORATION, a

Delaware corporation with a principal place of business at 50 Old Webster Road, Oxford,

Massachusetts 01540 (the "Borrower") hereby promises to pay to

a national banking association organized and existing under the laws of the United States of

America (the "Bank"), OR ORDER, at its office at 100 Federal Street, Boston, Massachusetts

02110, or such other place as the Bank may from time to time specify in writing, the principal

sum of

(or so much as may be outstanding from time to time) with interest on the unpaid principal until

paid at the rates and in the manner hereinafter provided in lawful money of the United States of

America in immediately available funds, without counterclaim or set-off and free and clear of,

and without any deduction or withholding for, any taxes or other payments.

This Revolving Credit Note restates in its entirety that certain Revolving Credit Note

dated June 14, 2008, as amended, made by the Borrower to the order of the Bank in the face

amount of $35,000,000.00.

This Revolving Credit Note is issued in conjunction with an Amended and Restated Loan

Agreement by and between the Borrower and the Bank dated as of even date herewith (as may

be amended from time to time, the "Agreement"), all the terms and conditions of which are

incorporated herein by reference. No reference to the Agreement or to any provision thereof

shall affect or impair the absolute and unconditional obligation of the Borrower to pay the

principal of and interest on this Revolving Credit Note as herein provided. An Event of Default

under the Agreement shall also constitute an Event of Default hereunder. The occurrence of an

Event of Default shall constitute a default (beyond any applicable grace or cure periods) under

each of the other obligations of the Borrower to the Bank. Capitalized terms used and not

otherwise defined herein shall have the meanings ascribed to such terms in the Agreement. "$"

or "dollars" denotes lawful currency of the United States of America.

Interest shall be calculated on the daily unpaid principal balance of the indebtedness

evidenced by this Revolving Credit Note computed on the basis of the actual number of days

elapsed over a year of 365/366 days, provided that interest shall be due for the actual number of

days elapsed during each period for which interest is being charged.

The unpaid principal of this Revolving Credit Note from time to time outstanding shall

bear interest at the applicable rate per annum, at the Borrower's written election from time to

time and in accordance with the provisions of this Revolving Credit Note, as follows:

(a) the LIBOR- Rate (Adjusted Periodically) plus the Applicable Margin (calculated

as set forth below) (a "LIBOR Rate Loan"); or

(b) the Bank's Base Rate plus the Applicable Margin (calculated as set forth below),

fully floating (a "Base Rate Loan").

The Applicable Margin will be based upon calculation by the Bank of Net Leverage, as

follows:

As used herein, the terms "Funded Debt" and "EBITDA" shall have the meanings

ascribed to such terms the Agreement. The Funded Debt to EBITDA Ratio shall be measured

as of the end of each fiscal quarter of the Borrower over a period comprised of the most recent

prior four (4) fiscal quarters of the Borrower.

The Applicable Margin on Base Rate Loans and LIBOR Rate Loans shall be adjusted as

of fifteen (15) Business Days after the earlier of (x) receipt and review by the Bank of Borrower's compliance certificate as required under Section 5.01(B)(3) of the Agreement or (y) the date on which

the financial covenants set forth in Section 5,01(F) of the Agreement are tested by the Bank. Such adjustments shall apply to Base Rate Loans effective immediately and to LIBOR Rate Loans made on or after the applicable date of the adjustment.

If the Borrower fails to select an interest rate for all or any portion of the unpaid principal

balance of this Revolving Credit Note or if the applicable LIBOR Rate becomes unavailable,

then the interest rate will be the Base Rate plus the Applicable Margin.

The term "Base Rate" means the higher of (a) the Bank's Prime Rate established from time to time by the Bank or (b) the Federal Funds Rate, fully floating. The "Prime Rate" means that variable per annum rate of interest so designated from time to time by the Bank as its Prime Rate. The Prime Rate is a reference rate and does not necessarily represent the lowest or best rate being charged to any customer. The "Federal Funds Rate" means, for any period, a fluctuating

interest rate equal for each day during such period to the weighted average of the rates on overnight Federal Funds transactions with members of the Federal Reserve System arranged by

federal funds brokers, as published for such day (or, if such day is not a Business Day, for the

next preceding Business Day) by the Federal Reserve Bank of New York or, if such rate is not so

published for any day which is a Business Day, the average of the quotations for such day on

such transactions received by the Bank from three (3) Federal Funds brokers of recognized

standing selected by the Bank.

"Business Day" means any day other than a Saturday, Sunday or day which shall be in The

Commonwealth of Massachusetts a legal holiday or day on which banking institutions are

required or authorized to close. If any payment under this Revolving Credit Note becomes due

on a day which is not a Business Day, the due date of such payment shall be extended to the next

succeeding Business Day, and such extension of time shall be included in computing interest and

fees in connection with such payment.

The "LIBOR Rate (Adjusted Periodically)" is a rate of interest equal to the rate per annum

equal to the London Interbank Offered Rate (or a comparable or successor rate which is

approved by the Bank), as published by Bloomberg (or other commercially available source

providing quotations of such rate as selected by the Bank from time to time) as determined for

each Adjustment Date at approximately 11:00 a.m. London time two (2) London Banking Days

prior to the Adjustment Date (a "LIBOR Interest Period"), for U.S. Dollar deposits (for delivery

on the first day of such interest period) with a term, ,upon request by the Borrowers for a

LIBOR Loan, of one (1), two (2) or three (3) months, as adjusted from time to time in the Bank's

sole discretion for reserve requirements, deposit insurance assessment rates and other regulatory

costs. Each LIBOR Loan shall be in an amount of integral multiples of $100,000.00. No

LIBOR Interest Period shall extend beyond the Revolving Credit Termination Date (defined

below). A "London Banking Day" is a day on which banks in London are open for business and

dealing in offshore dollars. If at any time the LIBOR Rate (Adjusted Periodically) is less than

zero, such rate shall be deemed to be zero for the purposes of this Agreement.

Interest on the Base Rate Loans shall be payable monthly in arrears on the first day of

each calendar month, the first such installment of interest to be due and payable on May 1, 2015.

Interest on LIBOR Rate Loans shall be payable in full at the end of the applicable LIBOR

Interest Period. All principal, interest and other indebtedness due hereunder if not sooner paid,

shall be due and payable on Apri130, 2020 (the "Revolving Credit Termination Date").

The Borrower may prepay Base Rate Loans in whole or in part without penalty or

premium. The Borrower may prepay a LIBOR Loan only upon at least three (3) Business Days

prior written notice to the Bank (which notice shall be irrevocable). The Borrower shall pay to

the Bank, upon request of the Bank, such amount or amounts as shall be sufficient (in the

reasonable opinion of the Bank) to compensate it for any loss, cost, or expense incurred as a

result of: (i) any payment of a LIBOR Loan on a date other than the last day of the LIBOR

Interest Period for such LIBOR Loan; (ii) any failure by the Borrower to borrow a LIBOR Loan

on the date specified by Borrower's written notice; (iii) any failure by the Borrower to pay a

LIBOR Loan on the date for payment specified in the Borrower's written notice. Without

limiting the foregoing, the Borrower shall pay to the Bank a "yield maintenance fee" in an

amount computed as follows: The current rate for United States Treasury securities (bills on a

discounted basis shall be converted to a bond equivalent) with a maturity date closest to the term

chosen pursuant to the LIBOR Rate Election as to which the prepayment is made, shall be

subtracted from the LIBOR Rate in effect at the time of prepayment. If the result is zero or a

negative number, there shall be no yield maintenance fee. If the result is a positive number, then

the resulting percentage shall be multiplied by the amount of the principal balance being prepaid.

The resulting amount shall be divided by 360 and multiplied by the number of days remaining

the term chosen pursuant to the LIBOR Rate Election as to which the prepayment is made. Said

amount shall be reduced to present value calculated by using the above referenced United States

Treasury securities rate and the number of days remaining in the term chosen pursuant to the

LIBOR Rate Election as to which prepayment is made. The resulting amount shall be the yield

maintenance fee due to the Bank upon the payment of a LIBOR Loan. Each reference in this

paragraph to "LIBOR Rate Election" shall mean the election by the Borrower of LIBOR Rate. If

by reason of an Event of Default, the Bank elects to declare this Revolving Credit Note

immediately due and payable, then any yield maintenance fee with respect to a LIBOR Loan

shall become due and payable in the same manner as though the Borrower had exercised such

right of prepayment.

If the entire amount of any required principal and/or interest is not paid in full within

fifteen (15) days after the same is due, the Borrower shall pay to the Bank a late fee equal to four

percent (4%) of the required payment. Such late charge payments are made for the purpose of

compensating the Bank for its administrative, costs and expenses in handling late payments and

losses in connection therewith. This provision is not intended to provide a grace period for any

payment otherwise due and payable and shall not constitute a waiver by the Bank to insist upon

the strict performance of any of the Borrower's covenants or agreements with, or obligations to,

the Bank or to declare any event of default for any payment not made when it was due and

payable.

All payments shall be applied first to the payment of all fees, expenses and other amounts

due to the Bank (excluding principal and interest), then to accrued interest, and the balance on

account of outstanding principal; provided, however, that after an Event of Default, payments

will be applied to the obligations of the Borrower to the Bank as the Bank shall determine in its

sole discretion.

Until the earlier of the Revolving Credit Termination Date or the occurrence of an Event

of Default, the Borrower may borrow, repay and reborrow hereunder from time to time, provided

that the aggregate principal amount at any time outstanding shall not exceed the face amount of

this Revolving Credit Note.

Upon the occurrence of an Event of Default (whether or not the Bank has accelerated

payment of this Revolving Credit Note), or after the Revolving Credit Termination Date or after

judgment has been rendered on this Revolving Credit Note or any other Obligations under the

Agreement, the Borrower's right to select pricing options shall cease and the unpaid principal of

this Revolving Credit Note, including interest, fees or costs which are not paid when due, will; at

the option of the Bank, bear interest at a rate which is four percent (4%) per annum greater than

the rate of interest which would otherwise be applicable hereunder (the "Default Rate"). This

may result in compounding of interest. This will not constitute a waiver of any Event of Default.

At its option, and at any time, whether immediately or otherwise, upon the occurrence of

an Event of Default, the Bank may declare this Revolving Credit Note immediately due and

payable without further action of any kind including notice, further demand or presentment.

The Borrower hereby authorizes the Bank, without liability on the Bank's part, to debit

from time to time from the Automatic Payments Deposit Account the Automatic Payments. If

the funds in the Automatic Payments Deposit Account are insufficient to cover any payment, the

Bank shall not be obligated to advance funds to cover the payment. At any time for any reason,

the Bank may voluntarily terminate Automatic Payments. The Bank shall provide the Borrower

timely notice of any debit made from the Automatic Payments Deposit Account or termination of

Automatic Payments.

Upon and after the occurrence of an Event of Default, (A) the Borrower hereby

authorizes the Bank, at any time and from time to time, without notice, which is hereby expressly

waived by the Borrower, and whether or not the Bank shall have declared any credit subject

hereto to be due and payable in accordance with the terms of the Agreement, to set off against,

and to appropriate and apply to the payment of, the Borrower's Obligations (whether matured or

unmatured, fixed or contingent, liquidated or unliquidated), any and all amounts owing by the

Bank to the Borrower (whether payable in U.S. dollars or any other currency, whether matured

or unmatured, and in the case of deposits, whether general or special (except trust and escrow

accounts), time or demand and however evidenced), and (B) pending any such action, to the

extent necessary, to'hold such amounts as collateral to secure such Obligations and to return as

unpaid for insufficient funds any and all checks and other items drawn against any deposits so

held as the Bank, in its sole discretion, may elect. The Borrower hereby grants to the Bank a

security interest in all deposits and accounts maintained with the Bank to secure the payment of

all Obligations of the Borrower to the Bank under this Revolving Credit Note, the Agreement

and all agreements, instruments and documents related to this Revolving Credit Note. TO THE

The Borrower shall pay on demand all expenses of the Bank in connection with the

preparation, administration, default, collection, waiver or amendment of loan terms, or in

connection with the Bank's exercise, preservation or enforcement of any of its rights, remedies

or options hereunder, including, without limitation, reasonable fees of outside legal counsel,

accounting, consulting, brokerage or other similar professional fees or expenses, and any fees or

expenses associated with travel or other costs relating to any appraisals or examinations

conducted in connection with the Loan or any collateral therefor, and the amount of all such

expenses shall, until paid, bear interest at the rate applicable to principal hereunder (including

any Default Rate) and be an obligation secured by any collateral.

The Borrower and each endorser or other person now or hereafter liable for the payment

of any of the indebtedness evidenced by this Revolving Credit Note, severally, agrees, by

making or endorsing this Revolving Credit Note or by making any agreement to pay any of the

indebtedness evidenced by this Revolving Credit Note, to waive presentment for payment,

protest and demand, notice of protest, demand and of dishonor and non-payment of this

Revolving Credit Note, and consents without notice or further assent: (a) to the substitution,

exchange, or release of any collateral securing this Revolving Credit Note or any part thereof at

any time; (b) to the acceptance by the holder or holders at any time of any additional collateral or

security of this Revolving Credit Note, (c) to the modification or amendment at any time, and

from time to time, of this Revolving Credit Note, the Agreement and any instrument securing

this Revolving Credit Note, at the request of any person liable hereon; (d) to the granting by the

holder hereof of any extension of the time for payment of this Revolving Credit Note or for the

performance of the agreements, covenants and conditions contained in this Revolving Credit

Note, the Agreement or any instrument securing this Revolving Credit Note, at the request of any

other person liable hereon; and (e) to any and all forbearances and indulgences whatsoever; and

such consent shall not alter or diminish the liability of any person.

This Revolving Credit Note shall be governed by, and the rights and obligations of the

parties hereunder shall be construed and interpreted in accordance with, the laws of The

Commonwealth of Massachusetts (excluding the laws applicable to conflicts or choice of law).

The Borrower agrees that any suit for the enforcement of this Revolving Credit Note or any of

the other Loan Documents may be brought in the courts of The Commonwealth of Massachusetts

or any Federal Court sitting therein and consents to the non-exclusive jurisdiction of such court

and to service of process in any such suit being made upon the Borrower by mail at the address

specified herein. The Borrower hereby waives any objection that it may now or hereafter have to

the venue of any such suit or any such court or that such suit was brought in an inconvenient

court.

This Revolving Credit Note is intended by the parties as the final, complete and exclusive

statement of the transactions evidenced by this Revolving Credit Note. All prior or

contemporaneous promises, agreements and understandings, whether oral or written, are deemed

to be superseded by this Revolving Credit Note, and no party is relying on any promise,

agreement or understanding not set forth in this Revolving Credit Note. This Revolving Credit

Note may not be amended or modified except by written instrument describing such

amendment or modification executed by the Borrower and the Bank.

No portion of the proceeds of the Loan shall be used, in whole or in part, for the purpose of

purchasing or carrying any "margin stock" as such term is defined in Regulation U of the Board

of Governors of the Federal Reserve System.

The Bank may at any time pledge or assign all or any portion of its rights under this

Revolving Credit Note or the Agreement (including any portion of the Note) to any of the twelve

(12) Federal Reserve Banks organized under Section 4 of the Federal Reserve Act, 12 U.S.C.

Section 341. No such pledge or assignment or enforcement thereof shall release the Bank from

its obligations under the Note, the Agreement or any loan documents related thereto.

Upon receipt of (i) an affidavit of an officer of the Bank as to the loss, theft, destruction

or mutilation of this Revolving Credit Note or any other loan document which is not of public

record, and (ii) an indemnity by the Bank in favor of the Borrower with respect to losses, claims

or damages resulting therefrom, and, in the case of any such loss, theft, destruction or mutilation,

upon cancellation of this Revolving Credit Note or other loan document, the Borrower will issue,

in lieu thereof, a replacement Revolving Credit Note or other loan document in the same

principal amount thereof and otherwise of like tenor.

IN WITNESS WHEREOF, the Borrower has caused this Revolving Credit Note to be

executed by its duly authorized representative as an instrument under seal as of the day and year

first above written.