Some properties of the mixed GaS0.4Se0.6 nonlinear crystal in comparison to GaSe

Georgi Marchev; Aleksey Tyazhev; Vladimir Panyutin; Valentin Petrov; Frank Noack; Kentaro Miyata; Michael Griepentrog

doi:10.1117/12.874452

21 February 2011 Some properties of the mixed GaS_0.4Se_0.6 nonlinear crystal in comparison to GaSe

Georgi Marchev, Aleksey Tyazhev, Vladimir Panyutin, Valentin Petrov, Frank Noack, Kentaro Miyata, Michael Griepentrog

Proceedings Volume 7917, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications X; 79171G (2011) https://doi.org/10.1117/12.874452
Event: SPIE LASE, 2011, San Francisco, California, United States

Abstract

Two essential advantages can be expected from adding S to the well known nonlinear crystal GaSe: increase of the bandgap value or the short wave cut-off limit and improved hardness. Recently, we confirmed that the non-centrosymmetric structure of GaSe is preserved up to a GaS content of 40 mol. % while the nonlinear coefficient d22 is reduced by only 24%. The increased band-gap results also in higher surface damage threshold. Our preliminary Sellmeier equations for GaS_0.4e_0.6 were based on refractive index measurements. These equations are refined in the present work by fitting second-harmonic generation and optical parametric amplification phase-matching angle data in the mid-infrared as well as birefringence data in the visible and near-infrared obtained with thin phase retardation plates. The two-photon absorption effect was studied for GaS_0.4e_0.6 and GaSe using amplified picosecond pulses at 1064 nm, at a repetition rate of 10 Hz. For intensities in the GW/cm² range, the two-photon absorption coefficient of GaS_0.4e_0.6 for the o-polarization is 3.5 times smaller than the corresponding coefficient of GaSe. This means that GaS_0.4e_0.6 could be safely used in Nd:YAG laser pumped nanosecond optical parametric oscillators or picosecond optical parametric amplifiers, without nonlinear absorption losses. The dynamic indentation measurements with Berkovich type indenter of c-cut GaS_0.4e_0.6and GaSe plates indicate about 30% higher indentation modulus and microhardness of GaS_0.4e_0.6 in comparison to GaSe.

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Georgi Marchev, Aleksey Tyazhev, Vladimir Panyutin, Valentin Petrov, Frank Noack, Kentaro Miyata, and Michael Griepentrog "Some properties of the mixed GaS_0.4Se_0.6 nonlinear crystal in comparison to GaSe", Proc. SPIE 7917, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications X, 79171G (21 February 2011); https://doi.org/10.1117/12.874452

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