Refined Sellmeier equations for BaGa₄S₇

Abstract

This paper reports refined Sellmeier equations for the biaxial nonlinear crystal B a G a 4 S 7 that provide a good reproduction of the phase-matching angles for second-harmonic generation (SHG) and sum-frequency generation (SFG) of the mid-IR outputs of Nd:YAG and Ho:YLF laser-pumped optical parametric oscillators (OPOs) and a frequency-doubled C O 2 laser in the 0.7584–8.018 µm range. The theoretical results are found to agree with the recent experimental data for 1-µm-pumped optical parametric processes based on B a G a 4 S 7 beyond 8 µm.

Barium Chalcogenide Crystals: A Review

“…Prisms were employed for this purpose, and the resulting data were approximated to the Sellmeier equations [52]. Subsequently, Kato et al presented improved Sellmeier equations derived from phase-matched nonlinear processes, such as second-harmonic, sum-frequency and difference-frequency generation [66]. These equations are valid within a wavelength range of 0.633-8.018 µm.…”

“…Kato et al later created improved Sellmeier equations that are applicable to the wavelength range of 0.8-10.6 µm [72,73]. The researchers employed a similar methodology to that used for BGS and BGSe [66,71]. Additionally, they derived thermo-optical dispersion formulas for BGGS and BGGSe crystals [72,74].…”