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Whispering gallery optical parametric oscillators for the mid-infrared spectral range

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


Vodopyanov, Konstantin L. (Hrsg.) ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Nonlinear Frequency Generation and Conversion: Materials and Devices XVII : 27 January - 1 February 2018, San Francisco, California, United States
Bellingham, WA: SPIE, 2018 (Proceedings of SPIE 10516)
Paper 105160E, 7 S.
Conference "Nonlinear Frequency Generation and Conversion - Materials and Devices" <17, 2018, San Francisco/Calif.>
Fraunhofer IPM ()
nonlinear optic; optical parametric oscillator; whispering gallery modes; mid-infrared

The tunability of cw optical parametric oscillators can be extended in the mid-infrared spectral range by using whispering gallery resonators (WGRs) made of non-oxide crystals. We demonstrate the fabrication of WGRs from silver gallium selenide, cadmium silicon phosphide and orientation-patterned gallium phosphide with quality factors above 106. The resonators made of the first two provide optical parametric oscillation in the mid-infrared pumped by a compact laser diode at 1.57 μm wavelength. The wavelength tunability of the device based on silver gallium selenide provides a tuning range beyond 8 μm wavelength. These achievements are considered as the first steps of cw optical parametric oscillators into this important spectral region.