Aspects for efficient wide spectral band THz generation via CO2 laser down conversion

Yu. N. Panchenko; Yu. M. Andreev; G. V. Lanskii; V. F. Losev; D. M. Lubenko

doi:10.1117/12.2065345

3 February 2015 Aspects for efficient wide spectral band THz generation via CO₂ laser down conversion

Yu. N. Panchenko, Yu. M. Andreev, G. V. Lanskii, V. F. Losev, D. M. Lubenko

Proceedings Volume 9255, XX International Symposium on High-Power Laser Systems and Applications 2014; 92554P (2015) https://doi.org/10.1117/12.2065345
Event: XX International Symposium on High Power Laser Systems and Applications, 2014, Chengdu, China

Abstract

Detailed model study of THz generation by CO₂ laser down-conversion in pure and solid solution crystals GaSe_1-xS_x is carried out for the first time. Both forward and backward collinear interactions of common (eo-e, oe-e, oe-o, oo-e, ee-o) and original (ee-e, oo-o) types are considered. Possibility of realization, phase matching angles and figure of merits are estimated for line mixing within 9 μm and 10 μm emission bands, as well between them. Dispersion properties of o- and e-wave refractive indices and absorption coefficients for GaSe, GaS and GaSe_1-xS_x crystals were preliminary measured by THz-TDS, approximated in the equation form and then used in the study. Estimated results are presented in the form of 3-D figures that are suitable for rapid analyses of DFG parameters. The most efficient type of interaction is eo-o type. Optimally doped (x = 0.09-0.13) GaSe_1-xS_x crystals are from 4 to 5 times more efficient at limit pump intensity than not doped GaSe crystals.

Citation Download Citation

Yu. N. Panchenko, Yu. M. Andreev, G. V. Lanskii, V. F. Losev, and D. M. Lubenko "Aspects for efficient wide spectral band THz generation via CO₂ laser down conversion", Proc. SPIE 9255, XX International Symposium on High-Power Laser Systems and Applications 2014, 92554P (3 February 2015); https://doi.org/10.1117/12.2065345

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