February 2020
Spotlight Summary by Patricia Segonds
Thermo-optic dispersion formula for BaGa2GeSe6
A thermo-optic dispersion formula combined with Sellmeier equations allows for the calculation of temperature dependence of measured phase-matching conditions for frequency conversion. This paper is devoted to such an investigation in the new successful BaGa2GeSe6 nonlinear crystal. Firstly, the authors measured the phase-matching conditions versus temperature and the associated temperature acceptance bandwidths for Second Harmonic Generation (SHG) and Sum Frequency Generation (SFG). They sent into oriented BaGa2GeSe6 slabs the 2.14–2.18 µm emission range of a KTP-OPO, the 1.61 µm wavelength of an RTA-OPO, as well as the fundamental, the frequency-doubled, and tripled outputs of a CO2 laser that were combined for SFG. Next, the thermo-optic dispersion formulas were determined in the 0.8–3.4 µm range by interpolating measured refractive indices versus temperature in a BaGa2GeSe6 prism. They were then extrapolated up to 10.6 µm, from the best fit of all the previously measured temperature acceptance bandwidths. As the authors validated their thermo-optic dispersion formula by confirming the measured phase-matching angles as a function of temperature for DFG between the signal and idler of a CTA OPO in BaGa2GeSe6, they predict a crystal more stable than BaGa4Se7 for OPOs and OPAs when pumped around 2 µm by high-average-power lasers.
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Article Information
Thermo-optic dispersion formula for BaGa2GeSe6
Kiyoshi Kato, Kentaro Miyata, Takayuki Okamoto, Valeriy V. Badikov, and Valentin Petrov
Appl. Opt. 58(35) 9709-9711 (2019) View: Abstract | HTML | PDF