Journal
OPTICS LETTERS
Volume 45, Issue 23, Pages 6486-6489Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.404979
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Funding
- Ministerio de Ciencia, Innovacion y Universidades (nuOPO) [TEC2015-68234-R]
- Generalitat de Catalunya (CERCA Programme)
- Severo Ochoa Programme for Centres of Excellence in RD [SEV-2015-0522-16-1]
- Fundacion Cellex
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We report the first green-pumped continuous-wave (cw) optical parametric oscillator (OPO) based on MgO:PPLN in a fanout grating design. Pumped by a single-frequency cw laser at 532 nm, the OPO provides tunable radiation across 813-1032 nm in the signal and 1098-1539 nm in the idler by simple mechanical translation at a fixed temperature of 55 degrees C. By deploying a 25-mm-long crystal to minimize thermal effects and using output coupling for the signal wave, we generate a total output power of up to 714 mW at 30% extraction efficiency in excellent Gaussian beam quality with M-2 < 1.1 and high output stability. Simultaneous measurements of signal and idler power result in passive stability of 2.8% and 1.8% rms, respectively, over 1 h. Strong thermal effects contribute to the high stability and excellent beam quality, while linear and green-induced infrared absorption limit the power scaling capabilities of the OPO. The output signal is single-mode with an instantaneous linewidth of similar to 3MHz and frequency stability of similar to 84 MHz over 72 s. (C) 2020 Optical Society of America
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