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90% pump depletion and good beam quality in a pulse-injection-seeded nanosecond optical parametric oscillator

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Abstract

We measured 90% pump depletion in a singly resonant image-rotating nanosecond optical parametric oscillator that was pulse-injection seeded by a self-generated signal pulse. The oscillator was pumped by an 8ns duration single-frequency 532nm pulse from an injection-seeded Q-switched Nd:YAG laser and resonated an 803nm signal. The pump and pulsed-seed beams had flat-topped spatial fluence profiles with diameters of approximately 6mm, giving a cavity Fresnel number at 803nm approaching 400. The beam cleanup effects of the image-rotating cavity produce a far-field signal spatial fluence profile with approximately 60% of its energy falling within the diffraction-limited spot size.

© 2006 Optical Society of America

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