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We have generated 65 mJ of single-mode sodium resonance radiation in 20-ns-duration pulses by the sum-frequency mixing of the output from two injection-seeded pulsed Nd:YAG lasers operating at 20 Hz. The observed spectral linewidth of the 589.158-nm radiation is measured to be less than 100 MHz, and the frequency stability is better than 100 MHz/h.
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Chiu et al. (1994) studied this question.
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