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Continuous-wave whispering-gallery optical parametric oscillator based on CdSiP2

: Jia, Yuechen; Hanka, Kevin; Zawilski, Kevin T.; Schunemann, Peter G.; Buse, Karsten; Breunig, Ingo

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Optics Express 26 (2018), Nr.8, S.10833-10841
ISSN: 1094-4087
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer IPM ()
nonlinear optic; nonlinear optical materials; parametric oscillator; parametric process; parametric amplifier

Continuous-wave (cw) optical parametric oscillators (OPOs) are ideally suited for applications, for example high-resolution spectroscopy, that need coherent sources combining narrow-linewidth emission with good wavelength tunability. Here, we demonstrate for the first time cw OPOs based on a millimeter-sized whispering gallery resonator (WGR) made of cadmium silicon phosphide (CdSiP2). By employing a compact laser diode at 1.57-μm wavelength for pumping, a cw OPO with wavelength tunability from 2.3 μm to 5.1 μm is realized based on such a resonator. The oscillation thresholds are in the milliwatt range. The maximum total power conversion efficiency reaches more than 15%. The intrinsic quality factor at 1.57 μm is determined to be 3.5 × 106. This work suggests that CdSiP2 is a very promising alternative for constructing mid-infrared parametric devices.