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20 April 1995 Diode-pumped Nd:YAG amplifier with 52-dB gain
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We have built a diode-pumped Nd:YAG optical amplifier with 52 dB small-signal gain and 1.125 Watts cw extractable power as gain approaches 0 dB. The amplifier is compact (15 cm X 10 cm X 5 cm). Two 2-Watt laser diodes provide the pump power for the amplifier. Gain is at the wavelength of 1.064 micrometers . We have modulated the output of an Nd:YAG diode-pumped cw oscillator with a waveguide modulator and amplified the modulated output. With an M equals 4 PPM modulation, the transmitted pulse power was 1.8 Watts increasing to 6.5 Watts at M equals 64. A greater increase would be possible if the modulator had a better contrast ratio. For pulse rates greater than 200 kHz inter-symbol interference was not a problem.
© (1995) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Thomas J. Kane, Emily A. P. Cheng, and Bao Nguyen "Diode-pumped Nd:YAG amplifier with 52-dB gain", Proc. SPIE 2381, Free-Space Laser Communication Technologies VII, (20 April 1995);

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