Continuous-wave nonspiking single-mode operation of ruby lasers cooled to 77 and 4.2 °K was obtained by end pumping the ruby with the 5145 Å output of a cw argon ion laser. Measurements of the output of the cw ruby laser showed single mode (TEM00q) operation with a full spectral width of approximately 35 kHz.
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Birnbaum et al. (1970) studied this question.
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