A high power, high-conversion-efficiency, and tunable continuous-wave external cavity pump singly resonant optical parametric oscillator (OPO) was proposed in this article. This OPO was based on multi-grating MgO-doped stoichiometric periodically poled LiTaO 3 (MgO:sPPLT) and pumped with 532 nm continuous wave fiber laser. The MgO:sPPLT-OPO could provide near-infrared radiation across 821-879 nm in the signal and 1352-1515 nm in the idler within four grating periods of 8.3-8.6 μm. When the pump power was 5.4 W, the maximum pump-to-signal conversion efficiency could reach 57.5% at 821 nm. The output power extended to 5.9 W in each period when the pump power reaches 13.6 W.
This article presents 561 nm single-wavelength laser by laser diode endpumped Nd:YAG crystal. The reflective volume Bragg grating is used as the output coupling mirror to effectively select the center wavelength of 1123 nm. The single wavelength laser output at 561 nm is obtained by intracavity frequency doubling via LBO crystal cut in accordance with Type I phase matching condition. When the pump power is 4 W, the output power reaches 229.6 mW, and the power instability is less than 3% within 5 min. Experiments show that the reflective volume Bragg grating acts as both a frequency selection element and an output coupling mirror, which simplifies the resonator structure and improves the laser output power.
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