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Aspects for efficient wide spectral band THz generation via CO2 laser down conversion Y. N. Panchenko, Y. M. Andreev, G. V. Lanskii [et.al.]

Contributor(s): Panchenko, Yu. N | Lanskii, Grigory V | Losev, V. F | Lubenko, D. M | Andreev, Yury M, 1946-Material type: ArticleArticleSubject(s): фазовый синхронизм | параметрическое преобразование частоты | ТГц лазерыGenre/Form: статьи в журналахOnline resources: Click here to access online In: Proceedings of SPIE Vol. 9255 : XX International Symposium on High-Power Laser Systems and Applications, 2014. P. 92554P-1-92554P-9Abstract: 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. Aspects for efficient wide spectral band THz generation via CO2 laser down conversion (PDF Download Available). Available from: https://www.researchgate.net/publication/281993171_Aspects_for_efficient_wide_spectral_band_THz_generation_via_CO2_laser_down_conversion [accessed May 3, 2017].
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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.

Aspects for efficient wide spectral band THz generation via CO2 laser down conversion (PDF Download Available). Available from: https://www.researchgate.net/publication/281993171_Aspects_for_efficient_wide_spectral_band_THz_generation_via_CO2_laser_down_conversion [accessed May 3, 2017].

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