Naval Research Laboratory, Code 3220, 4555 Overlook Ave. S.W., Washington, D.C. 20375-5326

66 -- LASER BEAM DELIVERY AND FOCUSING OPTICAL SYSTEM SOL N00173-99-R-AT03 POC Evangelina R. Toledo, Contract Specialist, Code 3220.AT, (202) 767-2021, Wayne Carrington, Contracting Officer WEB: Click Here, http://heron.nrl.navy.mil/contracts/home.htm. This modification is issued to answer technical questions regarding the combination synopsis/solicitation N00173-99-R-AT03 for Laser Beam Delivery and Focusing Optical System System that was issued on 29 January 1999. Question No. 1: What is the desired level of system packaging? Is a turn-key system preferred or a system with modules to be mounted on an optical table acceptable for lower cost? Answer: A turnkey system is not required. A modular system that can be mounted on an optical table is acceptable. Question No. 2: What are the end user's system interface requirements? In particular, regarding vacuum compatibility, is the interface geometry between the Beam Delivery System and the vacuum system defined? Answer: The major requirement is that the beam delivery system must be capable of delivering the laser beams into a vacuum system through a compatible vacuum flange. The vacuum chamber will be a modified six way cross, the top of which will sit approximately 50 inches off of the floor. Optical tables will be arranged around the chamber so that a beam delivery system can be mounted over the chamber. The laser beam must be delivered through the top port of the six way cross to a focusing optic inside the vacuum system. The focusing optic should be mountable to a vacuum flange and if a separate optic is required for focusing the UV and IR beams in the vacuum system, it must be easily exchanged (the vacuum system will be vented to atmospheric pressure during changeover operations). Question No. 3: Does the UV pulse have any time relation to the IR pulse? Are synchronization electronics required? Answer: The UV and IR pulses need not be synchronized or ever have any time relation to one another. If such is needed, we will handle the electronics. Question No. 4: Is higher pulse energy, shorter pulse width more desirable? Answer: The power characteristics defined in the specifications need to be retained. If a shorter pulse width laser is used, it must be capable of providing the specified pulse energy. If a higher power laser is used, it must be possible to attenuate the beam to supply the proper energy. A variable attenuator would be necessary. Question No. 5: Is there a preference between Gaussian focused spot and a flat top focused spot? Answer: A Gaussian focused spot is preferred. Question No. 6: (Item 2.5.1) What is the desired illumination spot size for the visible imaging system? Over what field-of-view does the 250 lp/mm imaging resolution requirement apply? Answer: Relatively uniform illumination over a 500 micron x 500 micron region is needed, which would typically mean that the region illuminated would be on the order of 1-2 mm. A 500 x 500 micron field of view is the minimum required for the specified 250 lp/mm imaging resolution. Question No. 7: Item (2.5.5.) What is the required frame rate for the real-time display? Answer: A standard video frame rate is sufficient for the real time video display (e.g. on the order of 32 frames/sec). Question No. 8: Are more detailed specifications for the CO2 laser available? The parameters of interests are: laser pulse energy, beam dimensions, beam polarization, and beam quality or divergence Answer: The CO2 laser has the following specifications: Pulse energy 390 millijoules/pulse (maximum) with a pulse width of 80-100 nanoseconds: beam profile is square with beam dimensions of 13 x 14 mm. Divergence, 2.08 mrad (vertical) and 2.53 mrad (horizontal); polarization is random (approximately 50% horizontal, 50% vertical). Question No. 9: Is it required that the IR laser beam be co-linear with UV beam before the focusing objective? Answer: The principal requirement for the laser beam alignment is that the focused spot from the IR laser be centered at the same place as the center of the focused spot for the UV laser. It is assumed that the beams will have to be co-linear over part of their paths to achieve this requirement (since the beams must enter through the same port on the vacuum system), but co-linearity is not required if the focusing requirement can be met. Forinformation regarding this solicitation contact Evangelina R. Toledo, Contract Specialist, (202) 767-2021. Posted 03/15/99 (W-SN308697). (0074)

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