By modulating the position of the standing-wave field inside the laser cavity electro-optically with certain discrete amplitudes, the population inversion can be made uniform for all positions along the axis. This produces spontaneous single-frequency output for homogeneously broadened lasers. It is shown experimentally that maximum stable single-frequency operation of a Nd : YAG laser can be obtained with this technique. Simultaneous doubling of the single frequency is also observed.
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Danielmeyer et al. (1970) studied this question.
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