GSI GROUP INC
SECOND SUPPLEMENTAL INDENTURE
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<DESCRIPTION>SECOND SUPPLEMENTAL INDENTURE
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 <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="right"><FONT FACE="Times New Roman" SIZE="2"><B>Exhibit 10.1 </B></FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px" ALIGN="center"><FONT
FACE="Times New Roman" SIZE="2">GSI GROUP CORPORATION </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="2">GSI GROUP INC. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px"
ALIGN="center"><FONT FACE="Times New Roman" SIZE="2">EXCEL TECHNOLOGY, INC. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="2">And </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px"
ALIGN="center"><FONT FACE="Times New Roman" SIZE="2">THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="2">11% Senior Notes due 2013 </FONT></P>
<P STYLE="margin-top:12px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="2">SECOND SUPPLEMENTAL INDENTURE </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="2">Dated as of
March&nbsp;5, 2009 </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="2">to </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman"
SIZE="2">INDENTURE </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="2">Dated as of August&nbsp;20, 2008 </FONT></P>

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 <P STYLE="margin-top:0px;margin-bottom:0px; text-indent:4%"><FONT FACE="Times New Roman" SIZE="2">SECOND SUPPLEMENTAL INDENTURE (the &#147;Supplemental Indenture&#148;) dated as of March&nbsp;5, 2009
between GSI Group Corporation, a Michigan corporation (the &#147;Issuer&#148;), GSI Group Inc., a company continued and existing under the laws of the Province of New Brunswick, Canada and the owner of all outstanding shares of voting capital stock
of the Issuer (the &#147;Parent&#148;), Excel Technology, Inc., a Delaware corporation (the &#147;Guarantor&#148;) and Bank of New York Mellon Trust Company, N.A., as trustee (the &#147;Trustee&#148;). </FONT></P> <P
STYLE="margin-top:24px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="2"><B>WITNESSETH: </B></FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT FACE="Times New Roman" SIZE="2"><B>WHEREAS, </B>the 11%
Senior Notes due 2013 (the &#147;Notes&#148;) were initially issued pursuant to an Indenture, dated August&nbsp;20, 2008, between the Issuer, the Parent, Eagle Acquisition Corporation and the Trustee, as supplemented by that First Supplemental
Indenture among the Company, the Guarantor and the Trustee (such Indenture as amended or supplemented from time to time, the &#147;Indenture&#148;); </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT
FACE="Times New Roman" SIZE="2"><B>WHEREAS, </B>pursuant to Section&nbsp;8.02 and in accordance with the other terms of the Indenture, the Company, the Parent, the Guarantor and the Trustee can enter into a supplemental indenture with the consent of
the Holders of at least a majority in aggregate principal amount of the Notes then outstanding; </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT FACE="Times New Roman" SIZE="2"><B>WHEREAS, </B>the Company received
consents from at least a majority in aggregate principal amount of the Notes outstanding to enter into the amendment related to this Supplemental Indenture pursuant to a Consent Solicitation Statement for Amendment to Indenture and the documents
related thereto that it sent to the Holders of the Notes on February&nbsp;23, 2009; </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT FACE="Times New Roman" SIZE="2"><B>WHEREAS,</B> the Company desires to enter into this
Supplemental Indenture to give effect to the consents received related to the Consent Solicitation Statement for Amendment to Indenture;<B> </B></FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT FACE="Times New Roman"
SIZE="2"><B>WHEREAS,</B> Section&nbsp;8.02 of the Indenture provides that, among other things, upon the written request of the Issuer, accompanied by a Board Resolution authorizing the execution of any such supplemental indenture, the Issuer, the
Parent, the Guarantor and the Trustee will enter into a supplemental indenture with the consent of the Holders of at least a majority in aggregate principal amount of the Notes then outstanding; </FONT></P> <P
STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT FACE="Times New Roman" SIZE="2"><B>WHEREAS,</B> all acts and proceedings required by law and under the Indenture to make this Supplemental Indenture a valid and binding agreement for
the uses and purposes set forth herein, in accordance with its terms, have been done and taken, and the execution and delivery of this Supplemental Indenture have been in all respects duly authorized by the Issuer, the Parent and the Guarantor; and
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 <P STYLE="margin-top:0px;margin-bottom:0px; text-indent:4%"><FONT FACE="Times New Roman" SIZE="2"><B>WHEREAS,</B> the foregoing recitals are made as representations of fact by the Issuer, the Parent and
the Guarantor and not by the Trustee. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT FACE="Times New Roman" SIZE="2"><B>NOW, THEREFORE,</B> in consideration of the foregoing and for other good and valuable
consideration, the receipt of which is hereby acknowledged, the Issuer, the Parent and the Guarantor and the Trustee hereby agree as follows: </FONT></P> <P STYLE="margin-top:24px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman"
SIZE="2">ARTICLE I </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="2">MODIFICATION </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT FACE="Times New Roman"
SIZE="2">Section&nbsp;1.01. Section&nbsp;6.01(4) of the Indenture is amended, from and after the date of this Supplemental Indenture, by adding the following: </FONT></P> <P STYLE="font-size:6px;margin-top:0px;margin-bottom:0px">&nbsp;</P>
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<TD WIDTH="5%" VALIGN="top" ALIGN="left"><FONT FACE="Times New Roman" SIZE="2">(a)</FONT></TD>
<TD ALIGN="left" VALIGN="top"><FONT FACE="Times New Roman" SIZE="2">the addition of &#147;,&#148; and the deletion of the word &#147;or&#148; after the word &#147;Trustee&#148; and before the word &#147;by&#148;; and </FONT></TD></TR></TABLE> <P
STYLE="font-size:6px;margin-top:0px;margin-bottom:0px">&nbsp;</P>
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<TD WIDTH="5%" VALIGN="top" ALIGN="left"><FONT FACE="Times New Roman" SIZE="2">(b)</FONT></TD>
<TD ALIGN="left" VALIGN="top"><FONT FACE="Times New Roman" SIZE="2">the addition of the following language after the word &#147;outstanding&#148; and before &#147;;&#148; at the end of such section: </FONT></TD></TR></TABLE> <P
STYLE="margin-top:6px;margin-bottom:0px; margin-left:17%"><FONT FACE="Times New Roman" SIZE="2">&#147;or by the beneficial owners of at least 25% of the aggregate principal amount of the Notes then outstanding; provided, however, that notice from
the beneficial owners pursuant to this Section&nbsp;6.01(4) shall be deemed proper only if, and as of such date, the Issuer has received such information and certifications (including from the Holder of the Note or any Agent Member) reasonably
necessary to determine that the person(s) providing such notice are beneficial owners of such Notes (for purposes of this Section&nbsp;6.01(4), the term &#147;beneficial owner&#148; has the meaning given such term in Rules 13d-3 and 13d-5 under the
Exchange Act)&#148;. </FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P>
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 <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="2">ARTICLE II </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px" ALIGN="center"><FONT
FACE="Times New Roman" SIZE="2">EFFECTIVE TIME </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT FACE="Times New Roman" SIZE="2">Section&nbsp;2.01. This Supplemental Indenture and the terms related to the amendment to
Section&nbsp;6.01(4) of this Supplemental Indenture will become effective as of the date hereof without any further action by any person. </FONT></P> <P STYLE="margin-top:24px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman"
SIZE="2">ARTICLE III </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="2">MISCELLANEOUS PROVISIONS </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT
FACE="Times New Roman" SIZE="2">Section&nbsp;3.01. <U>Indenture</U>. As amended by this Supplemental Indenture, the Indenture is in all respects ratified and confirmed, and all the terms, conditions and provisions thereof shall remain in full force
and effect. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT FACE="Times New Roman" SIZE="2">Section&nbsp;3.02. <U>Governing Law</U>. This Supplemental Indenture shall be governed by and construed in accordance with the
laws of the State of New York, as applied to contracts made and performed within the State of New York. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT FACE="Times New Roman" SIZE="2">Section&nbsp;3.03. <U>Successors
and Assigns</U>. All agreements of the Company, the Parent and the Guarantor in this Supplemental Indenture and the Notes shall bind its successors and all agreements of the Trustee in this Supplemental Indenture shall bind its successors.
</FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT FACE="Times New Roman" SIZE="2">Section&nbsp;3.04. <U>Multiple Counterparts</U>. The parties may sign multiple counterparts of this Supplemental Indenture. Each signed
counterpart shall be deemed an original, but all of them together represent one and the same agreement. </FONT></P> <P STYLE="margin-top:12px;margin-bottom:0px; text-indent:4%"><FONT FACE="Times New Roman" SIZE="2">Section&nbsp;3.05. <U>Notice of
Supplemental Indenture</U>. The Issuer covenants and agrees that, promptly after execution by the Issuer, the Parent, the Guarantor and the Trustee of this Supplemental Indenture, it shall give notice to all Holders of Notes of such fact in
accordance with the provisions of Section&nbsp;8.02 of the Indenture. </FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P>
 <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="2">-3- </FONT></P>


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 <P STYLE="margin-top:0px;margin-bottom:0px; text-indent:4%"><FONT FACE="Times New Roman" SIZE="2">Section&nbsp;3.06. <U>Trustee</U>. The Trustee makes no representations as to the validity or sufficiency
of this Supplemental Indenture. </FONT></P> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT SIZE="1">&nbsp;</FONT></P>
 <P STYLE="margin-top:0px;margin-bottom:0px" ALIGN="center"><FONT FACE="Times New Roman" SIZE="2">-4- </FONT></P>


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 <P STYLE="margin-top:0px;margin-bottom:0px; text-indent:4%"><FONT FACE="Times New Roman" SIZE="2"><B>IN WITNESS WHEREOF,</B> the parties hereto have caused this Supplemental Indenture to be duly executed
as of the day and year first above written. </FONT></P> <P STYLE="font-size:12px;margin-top:0px;margin-bottom:0px">&nbsp;</P><DIV ALIGN="right">
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<TD VALIGN="top" COLSPAN="3"><FONT FACE="Times New Roman" SIZE="2">GSI GROUP CORPORATION,</FONT></TD></TR>
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<TD VALIGN="top" COLSPAN="3"><FONT FACE="Times New Roman" SIZE="2">as Issuer</FONT></TD></TR>
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<TD HEIGHT="16" COLSPAN="2"></TD></TR>
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<TD VALIGN="top"><FONT FACE="Times New Roman" SIZE="2">By:</FONT></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="bottom"> <P STYLE="margin-top:0px;margin-bottom:1px;border-bottom:1px solid #000000"><FONT FACE="Times New Roman" SIZE="2">/s/ Sergio Edelstein</FONT></P></TD></TR>
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<TD VALIGN="top"><FONT FACE="Times New Roman" SIZE="2">Name:</FONT></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="bottom"><FONT FACE="Times New Roman" SIZE="2">Sergio Edelstein</FONT></TD></TR>
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<TD VALIGN="top"><FONT FACE="Times New Roman" SIZE="2">Title:</FONT></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="bottom"><FONT FACE="Times New Roman" SIZE="2">President and Chief Executive Officer</FONT></TD></TR>
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<TD HEIGHT="16" COLSPAN="3"></TD></TR>
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<TD VALIGN="top" COLSPAN="3"> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2">GSI GROUP INC.,</FONT></P> <P STYLE="margin-top:0px;margin-bottom:1px"><FONT FACE="Times New Roman" SIZE="2">as
Parent</FONT></P></TD></TR>
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<TD HEIGHT="16" COLSPAN="2"></TD></TR>
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<TD VALIGN="top"><FONT FACE="Times New Roman" SIZE="2">By:</FONT></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="bottom"> <P STYLE="margin-top:0px;margin-bottom:1px;border-bottom:1px solid #000000"><FONT FACE="Times New Roman" SIZE="2">/s/ Sergio Edelstein</FONT></P></TD></TR>
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<TD VALIGN="top"><FONT FACE="Times New Roman" SIZE="2">Name:</FONT></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="bottom"><FONT FACE="Times New Roman" SIZE="2">Sergio Edelstein</FONT></TD></TR>
<TR>
<TD VALIGN="top"><FONT FACE="Times New Roman" SIZE="2">Title:</FONT></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="bottom"><FONT FACE="Times New Roman" SIZE="2">President and Chief Executive Officer</FONT></TD></TR>
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<TD HEIGHT="16" COLSPAN="3"></TD></TR>
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<TD VALIGN="top" COLSPAN="3"> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2">EXCEL TECHNOLOGY, INC.,</FONT></P> <P STYLE="margin-top:0px;margin-bottom:1px"><FONT FACE="Times New Roman" SIZE="2">as
Guarantor</FONT></P></TD></TR>
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<TD HEIGHT="16"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD></TR>
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<TD VALIGN="top"><FONT FACE="Times New Roman" SIZE="2">By:</FONT></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="bottom"> <P STYLE="margin-top:0px;margin-bottom:1px;border-bottom:1px solid #000000"><FONT FACE="Times New Roman" SIZE="2">/s/ Sergio Edelstein</FONT></P></TD></TR>
<TR>
<TD VALIGN="top"><FONT FACE="Times New Roman" SIZE="2">Name:</FONT></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="bottom"><FONT FACE="Times New Roman" SIZE="2">Sergio Edelstein</FONT></TD></TR>
<TR>
<TD VALIGN="top"><FONT FACE="Times New Roman" SIZE="2">Title:</FONT></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="bottom"><FONT FACE="Times New Roman" SIZE="2">President and Chief Executive Officer</FONT></TD></TR>
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<TD HEIGHT="16" COLSPAN="3"></TD></TR>
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<TD VALIGN="top" COLSPAN="3"> <P STYLE="margin-top:0px;margin-bottom:0px"><FONT FACE="Times New Roman" SIZE="2">THE BANK OF NEW YORK MELLON TRUST COMPANY, N.A.,</FONT></P> <P STYLE="margin-top:0px;margin-bottom:1px"><FONT FACE="Times New Roman"
SIZE="2">as Trustee</FONT></P></TD></TR>
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<TD HEIGHT="16"></TD>
<TD HEIGHT="16" COLSPAN="2"></TD></TR>
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<TD VALIGN="top"><FONT FACE="Times New Roman" SIZE="2">By:</FONT></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="bottom"> <P STYLE="margin-top:0px;margin-bottom:1px;border-bottom:1px solid #000000"><FONT FACE="Times New Roman" SIZE="2">/s/ Vaneta Bernard</FONT></P></TD></TR>
<TR>
<TD VALIGN="top"><FONT FACE="Times New Roman" SIZE="2">Name:</FONT></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="bottom"><FONT FACE="Times New Roman" SIZE="2">Vaneta Bernard</FONT></TD></TR>
<TR>
<TD VALIGN="top"><FONT FACE="Times New Roman" SIZE="2">Title:</FONT></TD>
<TD VALIGN="bottom"><FONT SIZE="1">&nbsp;</FONT></TD>
<TD VALIGN="bottom"><FONT FACE="Times New Roman" SIZE="2">Vice President</FONT></TD></TR>
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