Narrow 0.540-μm second harmonic (SH) pulses (∼250 psec) have been observed from a mode-locked Nd:YAlO3 laser at a 300-mW SH power. The SH conversion efficiency observed was 50%. The laser was mode locked and frequency doubled using a single Ba2NaNb5O15 crystal, and emitted pulses at a frequency of c/l rather than c/2l at high conversion efficiencies. Since Nd:YAlO3 is transparent at 0.54 μm, complete extraction of the SH power generated in both directions is possible.
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Rice et al. (1971) studied this question.
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