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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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.

Original languageEnglish
Title of host publicationXX International Symposium on High-Power Laser Systems and Applications 2014
PublisherSPIE
Volume9255
ISBN (Electronic)9781628413229
DOIs
Publication statusPublished - 2015
Event20th International Symposium on High Power Systems and Applications 2014, HPLS and A 2014 - Chengdu, China
Duration: 25 Aug 201429 Aug 2014

Conference

Conference20th International Symposium on High Power Systems and Applications 2014, HPLS and A 2014
CountryChina
CityChengdu
Period25.8.1429.8.14

Keywords

  • figure of merit
  • GaSe
  • GaSeS
  • parametric frequency conversion
  • phase matching
  • THz

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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  • Cite this

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