HIGH POWER LASER AMPLIFIER CHAIN TECHNIQUES.
Quarterly progress rept. no. 1, 14 Jul-14 Oct 64,
ELECTRO-OPTICAL SYSTEMS INC PASADENA CALIF QUANTUM PHYSICS DIV
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This report describes work directed toward the development of an optical radar transmitter using the masteroscillator-power-amplifier MOPA concept. The system will employ a CW YAGNd3 oscillator and a chain of amplifiers, taking advantage of the power-handling capability of neodymium-doped glass to produce adequate power for long distance surveillance. Because a laser amplifies equally well in both directions and generates noise by spontaneous decay, careful design is necessary to avoid regeneration in the amplifier chain, prevent amplifier noise in the reverse direction from swamping the oscillator, control depumping caused by superradiance, and provide a good signal-to-noise ratio in the transmitted signal. This report includes discussion of cw oscillator and pulsed amplifier designs, measurements of amplifier gain, and calculations of the limitations imposed by superradiance. Author