Abstract

We report a continuous-wave optical parametric oscillator (OPO) based on periodically poled ${\mathrm{RbTiOAsO}}_4$ (PPRTA). The singly resonant OPO, which is located within a Ti:sapphire laser, has a high-finesse signal cavity and delivers a maximum output power of 270 mW to the nonresonant idler wave at $2.92 \mathit{\mu }\mathrm{m}$, through a 4.5-mm PPRTA crystal. For room-temperature operation and a crystal with a $30‐\mathit{\mu }\mathrm{m}$ grating period, pump tuning over 838–848 nm results in OPO tuning over $1.13–1.27 \mathit{\mu }\mathrm{m}$ (signal) and $2.53–3.26 \mathit{\mu }\mathrm{m}$ (idler), limited by the bandwidth of optical coatings. PPRTA exhibits thermal properties superior to those of periodically poled ${\mathrm{LiNbO}}_3$.

© 1998 Optical Society of America

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