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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Grover Swartzlander
  • Vol. 30, Iss. 11 — Nov. 1, 2013
  • pp: 2882–2888

Terahertz emission from ZnGeP2: phase-matching, intensity, and length scalability

Joseph D. Rowley, Derek A. Bas, Kevin T. Zawilski, Peter G. Schunemann, and Alan D. Bristow  »View Author Affiliations


JOSA B, Vol. 30, Issue 11, pp. 2882-2888 (2013)
http://dx.doi.org/10.1364/JOSAB.30.002882


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Abstract

Collinear phase-matched optical rectification is studied in ZnGeP2 pumped with near-infrared light. The pump-intensity dependence is presented for three crystal lengths (0.3, 1.0, and 3.0 mm) to determine the effects of linear optical absorption, nonlinear optical absorption, and terahertz free-carrier absorption on the generation. Critical parameters such as the coherence length (for velocity matching), dispersion length (for linear pulse broadening), and nonlinear length (for self-phase modulation) are determined for this material. These parameters provide insight into the upper limit of pulse intensity and crystal length required to generate intense terahertz pulses without detriment to the pulse shape. It is found that 1 mm thick ZnGeP2(012), pumped at 1.28 μm with intensity of 15GW/cm2, will produce intense undistorted pulses, whereas longer crystals or larger intensities modify the pulse shape to varying degrees. Moreover, phase-matching dispersion maps are presented for the terahertz generation over a large tuning range (1.1–2.4 μm) in the longer (3 mm) crystal, demonstrating the phase-matching bandwidth and phase mismatch that leads to fringing associated with multipulse interference. All observed results are simulated numerically showing good qualitative agreement.

© 2013 Optical Society of America

OCIS Codes
(190.4180) Nonlinear optics : Multiphoton processes
(190.5970) Nonlinear optics : Semiconductor nonlinear optics including MQW
(230.6080) Optical devices : Sources
(190.4223) Nonlinear optics : Nonlinear wave mixing

ToC Category:
Nonlinear Optics

History
Original Manuscript: June 4, 2013
Revised Manuscript: August 22, 2013
Manuscript Accepted: September 18, 2013
Published: October 15, 2013

Citation
Joseph D. Rowley, Derek A. Bas, Kevin T. Zawilski, Peter G. Schunemann, and Alan D. Bristow, "Terahertz emission from ZnGeP2: phase-matching, intensity, and length scalability," J. Opt. Soc. Am. B 30, 2882-2888 (2013)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-30-11-2882


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