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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 18 — Aug. 30, 2010
  • pp: 18732–18743

Investigation of thermally-induced phase mismatching in continuous-wave second harmonic generation: A theoretical model

Mohammad Sabaeian, Laleh Mousave, and Hamid Nadgaran  »View Author Affiliations

Optics Express, Vol. 18, Issue 18, pp. 18732-18743 (2010)

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A fraction of the fundamental beam energy deposited into nonlinear crystals to generate second harmonic waves (SHW) causes a temperature gradient within the crystal. This temperature inhomogeneity can alter the refractive index of the medium leading to a well-known effect called thermal dispersion. Therefore, the generated SHW suffers from thermal lensing and a longitudinal thermal phase mismatching. In this work by coupling the heat equation with second harmonic generation (SHG) formalism applied to type-II configuration along with walk-off effect, we investigate the continuous wave (CW) SHW beam profile and conversion efficiency when a non-linear KTP crystal is under induced thermal load. We have demonstrated for average and high powers, the thermal de-phasing lead to considerable reduction in SHG compared to an ideal case in which induced heat is neglected.

© 2010 OSA

OCIS Codes
(140.6810) Lasers and laser optics : Thermal effects
(190.0190) Nonlinear optics : Nonlinear optics

ToC Category:
Nonlinear Optics

Original Manuscript: May 26, 2010
Revised Manuscript: July 10, 2010
Manuscript Accepted: July 11, 2010
Published: August 18, 2010

Mohammad Sabaeian, Laleh Mousave, and Hamid Nadgaran, "Investigation of thermally-induced phase mismatching in continuous-wave second harmonic generation: a theoretical model," Opt. Express 18, 18732-18743 (2010)

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