A 62-pass free-space quasi-phase-matched cell converts 3.7 mJ pump pulses to 1 uJ second-harmonic output in quartz at 0.027% efficiency, a >1000-fold gain over single-pass operation.
Laser Damage Threshold Evaluation of Nonlinear Crystal Quartz for Sub-Nanosecond Pulse Irradiation,
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Free-space quasi-phase matched second harmonic generation in crystalline quartz
A 62-pass free-space quasi-phase-matched cell converts 3.7 mJ pump pulses to 1 uJ second-harmonic output in quartz at 0.027% efficiency, a >1000-fold gain over single-pass operation.