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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Vol. 15, Iss. 1 — Jan. 1, 1998
  • pp: 438–445

Second-harmonic generation in biaxial crystals for a focused fundamental Gaussian laser beam: application to (–)2-α-(methylbenzylamino)- 5-nitropyridine single crystals

P. Kerkoc, R. T. Bailey, F. R. Cruickshank, and D. Pugh  »View Author Affiliations


JOSA B, Vol. 15, Issue 1, pp. 438-445 (1998)
http://dx.doi.org/10.1364/JOSAB.15.000438


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Abstract

The second-harmonic nonlinear optical susceptibility tensor of (-)2-α-(methylbenzylamino)-5-nitropyridine single crystals has been calculated from electric-field-induced second-harmonic generation (SHG) data and the oriented-gas model. From this tensor the calculated value of the maximum effective nonlinear optical susceptibility deff for phase-matched SHG was found to be 6.5 pm V-1. Calculations along the whole of the phase-matching locus show that the highest value of deff is in the region of the lowest values of the second-harmonic wave beam walk-off angle. The walk-off angle of the fundamental is approximately five times smaller. A theory necessary for the optimization of SHG efficiency in biaxial crystals is developed and it is shown that, for the range of crystal lengths and beam walk-off angles available, the criteria for the selection of the parameters w0,z0, and Δk for optimization of the second-harmonic signal are the same in biaxial and uniaxial crystals. The optimal configuration for the highest second-harmonic efficiency on the phase-matching locus has been determined. The maximum SHG figure of merit, P2ω(l)/Pω2(0), is found to be 3.7×10-3 W-1 for a 50-mm-long crystal.

© 1998 Optical Society of America

OCIS Codes
(190.3100) Nonlinear optics : Instabilities and chaos
(190.4710) Nonlinear optics : Optical nonlinearities in organic materials

Citation
P. Kerkoc, R. T. Bailey, F. R. Cruickshank, and D. Pugh, "Second-harmonic generation in biaxial crystals for a focused fundamental Gaussian laser beam: application to ()2-α-(methylbenzylamino)- 5-nitropyridine single crystals," J. Opt. Soc. Am. B 15, 438-445 (1998)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-15-1-438

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