The operation of a continuous-wave optical parametric oscillator (OPO) based on periodically-poled RbTiOAsO4 (PPRTA) and using a pump-enhanced cavity configuration is described. The OPO was pumped by a single-frequency Nd:YVO4 laser and temperature tuning ranges of 1.525–1.583µm and 3.245–3.520µm were achieved at the signal and idler, respectively. The external threshold was 250mW and up to 87mW of idler was generated. Fine-tuning behavior of the OPO and material quality of the PPRTA were investigated. We believe this to be the first reported example of an externally-pumped cw OPO based on PPRTA.
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