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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 4 — Feb. 15, 2010
  • pp: 3338–3344

Prism-coupled Cherenkov phase-matched terahertz wave generation using a DAST crystal

Koji Suizu, Takayuki Shibuya, Hirohisa Uchida, and Kodo Kawase  »View Author Affiliations

Optics Express, Vol. 18, Issue 4, pp. 3338-3344 (2010)

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Terahertz (THz) wave generation based on nonlinear frequency conversion is a promising method for realizing a tunable monochromatic high-power THz-wave source. Unfortunately, many nonlinear crystals have strong absorption in the THz frequency region. This limits efficient and widely tunable THz-wave generation. The Cherenkov phase-matching method is one of the most promising techniques for overcoming these problems. Here, we propose a prism-coupled Cherenkov phase-matching (PCC-PM) method, in which a prism with a suitable refractive index at THz frequencies is coupled to a nonlinear crystal. This has the following advantages. Many crystals can be used as THz-wave emitters; the phase-matching condition inside the crystal does not have to be observed; the absorption of the crystal does not prevent efficient generation of radiation; and pump sources with arbitrary wavelengths can be employed. Here we demonstrate PCC-PM THz-wave generation using the organic crystal 4-dimethylamino-N-metyl-4-stilbazolium tosylate (DAST) and a Si prism coupler. We obtain THz-wave radiation with tunability of approximately 0.1 to 10 THz and with no deep absorption features resulting from the absorption spectrum of the crystal. The obtained spectra did not depend on the pump wavelength in the range 1300 to 1450 nm. This simple technique shows promise for generating THz radiation using a wide variety of nonlinear crystals.

© 2010 OSA

OCIS Codes
(190.4410) Nonlinear optics : Nonlinear optics, parametric processes
(190.4223) Nonlinear optics : Nonlinear wave mixing

ToC Category:
Nonlinear Optics

Original Manuscript: January 7, 2010
Revised Manuscript: January 25, 2010
Manuscript Accepted: January 26, 2010
Published: February 1, 2010

Koji Suizu, Takayuki Shibuya, Hirohisa Uchida, and Kodo Kawase, "Prism-coupled Cherenkov phase-matched terahertz wave generation using a DAST crystal," Opt. Express 18, 3338-3344 (2010)

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