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A ruby laser with a pulsed argon ion laser as a pump was constructed and operated at 77° and 300°K. Threshold for oscillation was ∼13 mJ. A unique type of Q-switched operation was observed that produced pulses of ∼15 nsec at 300°K and ∼6 nsec at 77°K.
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Birnbaum et al. (1968) studied this question.
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