HGS-crystal optical parametric oscillator tunable in the wavelength range 4.75–9.07 μm
V.S. Ayrapetyan, A.V. Makeev
Siberian State University of Geosystems and Technologies, Russia, Novosibirsk
Keywords: optical parametric oscillator, nonlinear crystal, mercury thiogallate, spectral width of laser radiation
Abstract
An optical circuit is designed for the ring cavity of an optical parametric oscillator (OPO) based on two series-mounted active elements-mercury thiagollate crystals (HgGa2S4) with the radiation tunable in the near and middle infrared ranges 4.75-9.07 μm. The dependences of the radiation idle wavelength on the phase-matching angle and of the distribution of the IR OPO output radiation intensity on the idle wavelength are calculated. A possibility of narrowing the spectral width of the output radiation by introducing a dispersing element (Fabry-Perot etalon) into the cavity is considered.
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