Compact, single-frequency, high-power Nd: glass laser

A compact, single-frequency high-power Nd:glass laser was developed. Single longitudinal mode operation of the oscillator was provided by injection-seeding it with CW laser radiation. A four-pass amplifier with a spatial filter provided an output energy of 2.7 J with more than 30% extraction efficiency. The output beam divergency was twice the diffraction limit.<
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