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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 16 — Aug. 2, 2010
  • pp: 17306–17312

New method to determine the refractive index and the absorption coefficient of organic nonlinear crystals in the ultra-wideband THz region

Seigo Ohno, Katsuhiko Miyamoto, Hiroaki Minamide, and Hiromasa Ito  »View Author Affiliations

Optics Express, Vol. 18, Issue 16, pp. 17306-17312 (2010)

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A method for simultaneously measuring the refractive index and absorption coefficient of nonlinear optical crystals in the ultra-wideband terahertz (THz) region is described. This method is based on the analysis of a collinear difference frequency generation (DFG) process using a tunable, dual-wavelength, optical parametric oscillator. The refractive index and the absorption coefficient in the organic nonlinear crystal DAST were experimentally determined in the frequency range 2.5–26.2 THz by measuring the THz-wave output using DFG. The resultant refractive index in the x-direction was ~2.3, while the absorption spectrum was in good agreement with FT-IR measurements. The output of the DAST-DFG THz-wave source was optimized to the phase-matching condition using the measured refractive index spectrum in THz region, which resulted in an improvement in the output power of up to a factor of nine.

© 2010 OSA

OCIS Codes
(160.4890) Materials : Organic materials
(190.4410) Nonlinear optics : Nonlinear optics, parametric processes

ToC Category:
Nonlinear Optics

Original Manuscript: June 21, 2010
Revised Manuscript: July 18, 2010
Manuscript Accepted: July 23, 2010
Published: July 29, 2010

Seigo Ohno, Katsuhiko Miyamoto, Hiroaki Minamide, and Hiromasa Ito, "New method to determine the refractive index and the absorption coefficient of organic nonlinear crystals in the ultra-wideband THz region," Opt. Express 18, 17306-17312 (2010)

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