Exhibit 1

Joint Filing Agreement

PURSUANT TO RULE 13d-1(k)

The undersigned acknowledge and agree that the foregoing statement on Schedule 13D is filed on behalf of each of the undersigned and that all subsequent amendments to this statement on Schedule 13D may be filed on behalf of each of the undersigned without the necessity of filing additional joint filing agreements. The undersigned acknowledge that each shall be responsible for the timely filing of such amendments, and for the completeness and accuracy of the information concerning it contained herein and therein, but shall not be responsible for the completeness and accuracy of the information concerning the others, except to the extent that it knows that such information is inaccurate.

Dated: September 26, 2014

PHOTON ACQUISITION CORPORATION
By:	/s/ Ramzi M. Musallam
	Name:  Ramzi M. Musallam
	Title:  President
PHOTON HOLDINGS CORPORATION
By:	/s/ Ramzi M. Musallam
	Name:  Ramzi M. Musallam
	Title:  President
PHOTON HOLDING LLC
By:	/s/ Ramzi M. Musallam
	Name:  Ramzi M. Musallam
	Title:  President
THE VERITAS CAPITAL FUND IV, L.P.
By:	/s/ Hugh D. Evans
	Name:  Hugh D. Evans
	Title:  Managing Member
VERITAS CAPITAL PARTNERS IV, L.L.C.
By:	/s/ Hugh D. Evans
	Name:  Hugh D. Evans
	Title:  Managing Member
/s/ Ramzi M. Musallam
Ramzi M. Musallam
/s/Hugh D. Evans
Hugh D. Evans
/s/ Benjamin M. Polk
Benjamin M. Polk