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Proceedings Paper

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

Detailed model study of THz generation by CO2 laser down-conversion in pure and solid solution crystals GaSe1-xSx 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 GaSe1-xSx 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) GaSe1-xSx crystals are from 4 to 5 times more efficient at limit pump intensity than not doped GaSe crystals.

Paper Details

Date Published: 3 February 2015
PDF: 9 pages
Proc. SPIE 9255, XX International Symposium on High-Power Laser Systems and Applications 2014, 92554P (3 February 2015); doi: 10.1117/12.2065345
Show Author Affiliations
Yu. N. Panchenko, Institute of High Current Electronics (Russian Federation)
Yu. M. Andreev, Institute for Monitoring of Climatic and Ecological Systems (Russian Federation)
Tomsk State Univ. (Russian Federation)
G. V. Lanskii, Institute for Monitoring of Climatic and Ecological Systems (Russian Federation)
Tomsk State Univ. (Russian Federation)
V. F. Losev, Institute of High Current Electronics (Russian Federation)
Tomsk Polytechnic Univ. (Russian Federation)
D. M. Lubenko, Institute of High Current Electronics (Russian Federation)


Published in SPIE Proceedings Vol. 9255:
XX International Symposium on High-Power Laser Systems and Applications 2014
Chun Tang; Shu Chen; Xiaolin Tang, Editor(s)

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