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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)
http://dx.doi.org/10.1364/OE.18.017306


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Abstract

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

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

Citation
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)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-18-16-17306


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