Femtosecond Yb-fiber laser synchronously pumped HgGa2S4 optical parametric oscillator tunable in the 4.4- to 12-μm range

Stefan Popien; Marcus Beutler; Ingo Rimke; Dmitrii Badikov; Valeriy Badikov; Valentin Petrov

doi:10.1117/1.OE.57.11.111802

22 September 2018 Femtosecond Yb-fiber laser synchronously pumped HgGa2S4 optical parametric oscillator tunable in the 4.4- to 12-μm range

Stefan Popien, Marcus Beutler, Ingo Rimke, Dmitrii Badikov, Valeriy Badikov, Valentin Petrov

Author Affiliations +

Optical Engineering, Vol. 57, Issue 11, 111802 (September 2018). https://doi.org/10.1117/1.OE.57.11.111802

Abstract

We employed an HgGa₂S₄ nonlinear crystal to achieve the highest average power from a high-repetition rate mid-infrared femtosecond optical parametric oscillator (OPO), synchronously pumped near 1 μm. The continuous tuning of the nonresonated idler extended from below 4.4 to beyond 12 μm. The OPO was pumped by a 6.5-W, 1.035-μm, 81-MHz, 220-fs Yb-fiber laser. The idler output reached an average power of over 355 mW at 5.2 μm (at a signal power of > 2 W at 1.25 μm). The peak quantum efficiency of the OPO approached 40%. The signal output was diffraction limited with M² < 1.1. No crystal damage was observed at average pump intensities as high as 60 kW/cm².

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Stefan Popien, Marcus Beutler, Ingo Rimke, Dmitrii Badikov, Valeriy Badikov, and Valentin Petrov "Femtosecond Yb-fiber laser synchronously pumped HgGa2S4 optical parametric oscillator tunable in the 4.4- to 12-μm range," Optical Engineering 57(11), 111802 (22 September 2018). https://doi.org/10.1117/1.OE.57.11.111802

Received: 1 May 2018; Accepted: 3 July 2018; Published: 22 September 2018

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