NASA/Goddard Space Flight Center Earth Sciences Procurement Office, Code 289 Greenbelt, MD 20771

A -- DEVELOPMENT AND TESTING OF LONG-LIVED QUASI-CW STACKED LASER DIODE ARRAYS FOR GEOSCIENCE LASER ALTIMETER SYSTEM (GLAS) LASER TRANSMITTER SOL RFP5-88846/258 POC Kevin Stephen, Contract Specialist (301) 286-5798; Nancy Farnan Lockard, Contracting Officer (301) 286-6143. DEVELOPMENT AND TESTING Of LONG-LIVED QUASI-CW STACKED LASER DIODE ARRAYS For THE GEOSCIENCE LASER ALTIMETER SYSTEM (GLAS) LASER TRANSMITTER. The Goddard Space Flight Center intends to issue a Request for Proposal 5-88846/258 on a sole-source basis to the Spectra Diode Lab, Inc. (SDL) in San Jose, California. The highlighted technical specifications for the product are as follows: 1) Configuration - 3 set of arrays stacks with an emitting aperture of 10mm X 1.6mm and a center to center array spacing of 0.8mm; Optical specifications - Peak optical power of 100 W/array; Electrical Specifications - Peak operating current no greater than 130 amperes with a compliance voltage no greater than 16 volts; Thermal specifications - The array is to be conductively cooled and shall have a thermal resistance of less than 2 degrees C/W between diode junctions; Life and reliability - Devices must be able to sustain operation for at least 2 billion pulses. Verification data indicating a high probability of achieving this lifetime (less than 20% degradation) must be submitted. The life data shall as a minimum show the degradation rate of linear arrays equivalent to those which are to be stacked form the stacked arrays. Either constant current or constant power lifetests are acceptable; 2) Conduct a lifetest of the 3 devices for 10 billion shots (approximately 16 weeks); 3) Conduct a lifetest of the 3 devices at 1000 Hz with 200 microsecond pulses for a period of 10 billion pulses (16.5 weeks), starting one device at 100 W quasi-CW power, one device at 80 W quasi-CW power, and one device at 860 W quasi-CW power. The devices shall be kept at the commensurate current levels for these intitial powers throughout the 10 billion shot test (i.e. constant current). The vendor shall monitor and record the current and power levels each 200 million (2.5 days) for the first one billion pulses (11.5 days) and then every one billion pulses thereafter at constant current; 4) Conduct and record far-field divergence and power vs. current tests for each stack at the beginning and end of the lifetest. The statutory authority ofr Other Than Full and Open Competition is 10 U.S.C. 2304 (c) (1) -- Only one responsible source. SDL originally defined the development and testing approach needed to support this effort, and possesses the highly qualified personnel with unique experience and expertise with the 100 Watt Peak Power Quasi - CW Laser Diode Array. The anticipated contract type will be Firm-Fixed-Price with a period of performance of 6 months. Any other persons desiring consideration are requested to fully identify their interest and capabilities in writing within 15 days of the date of publication of this synopsis. Any request for consideration must be mailed to the attention of the Contract Specialist above. (0033)

Loren Data Corp. http://www.ld.com (SYN# 0005 19950203\A-0005.SOL)