AlGaAs Semiconductor Laser Illuminator.
Abstract
This program was directed at development of an acoustically covert, non-cryogenically cooled AlGaAs Semiconductor Laser Illuminator compatible with night vision equipment. The arraying approach undertaken for development used micro-cylindrical lenses attached to the face of the laser diodes and imaging the 2.5 micron junction. A conventionally drawn glass fiber was used for this lens. A solid glass integrator with a 3 to 1 taper ratio was used to compress the fan beams from the array into a 0.30 x 0.10 inch rectangular source for final projection by an F/1.0 projection lens. Alignment and attachment techniques of the micro lenses were developed allowing repeatable and reliable mounting in large scale arrays. The array was temperature stabilized by a high capacity single stage thermoelectric cooler. Heat exchange of the array, thermoelectric and driver dissipation was accomplished by a low noise ( < 40 dB) fan and large area heat exchanger.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1974
- Accession Number
- ADA005655
Entities
People
- Elliott C. Lea
- Larry S. O'hara
- William W. Barratt