A design concept suitable for space applications is proposed on the basis of a diode-pumped Nd:YAG laser transmitter laboratory breadboard; this transmitter must not only furnish the data carrier but also serve as a tracking reference and (in conjunction with a boost amplifier) as a beacon for receiver-station acquisition. The diffraction-limited beam is generated with 6.3-percent electrical-to-optical conversion efficiency. The proposed space communications system will incorporate astigmatically-focused stacked-laser diodes for continuous reliable operation over the course of seven years.
Ulrich A. Johann,
"1W cw diode-pumped Nd:YAG laser for coherent space communication systems", Proc. SPIE 1522, Optical Space Communication II, (1 May 1991); doi: 10.1117/12.46093; https://doi.org/10.1117/12.46093