Abstract

We report the successful operation of a visible optical parametric oscillator (OPO) that uses urea as the nonlinear medium and is pumped in the near field of an injection-seeded pulsed XeCl excimer laser operating at 308 nm The OPO can generate continuously tunable radiation from 537 to 720 nm with a single set of dichroic mirrors and conversion efficiencies as high as 37% have been achieved in a 15-mm-long crystal at 90° phase matching. The influence of crystal double refraction (and hence beam walk-off) on the conversion efficiency across the OPO tuning range is discussed, and some oscillator parameters, including spectral linewidth and temporal behavior are characterized.

© 1989 Optical Society of America

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