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 duration single-frequency pulse from an injection-seeded Q-switched Nd:YAG laser and resonated an signal. The pump and pulsed-seed beams had flat-topped spatial fluence profiles with diameters of approximately , giving a cavity Fresnel number at 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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