Single-longitudinal-mode lasers, particularly dual wavelength coherent sources, are valuable for a variety of applications ranging from telecommunications to inter-ferometric sensing. Recently, there has been considerable interest in single frequency neodymium lasers pumped with diode lasers. A particularly simple form of these devices is the cube laser in which a short 500-1000-μm thick plano-plano piece of a laser material such as Nd:YAG is longitudinally pumped with a diode laser.1

© 1990 Optical Society of America

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