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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 53, Iss. 23 — Aug. 10, 2014
  • pp: 5109–5116

Temperature nonuniformity occurring during the cooling process of a KDP crystal and its effects on second-harmonic generation

Yingchun Liang, Ruifeng Su, Lihua Lu, and Haitao Liu  »View Author Affiliations


Applied Optics, Vol. 53, Issue 23, pp. 5109-5116 (2014)
http://dx.doi.org/10.1364/AO.53.005109


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Abstract

The temperature nonuniformity occurring during the cooling process of a KDP crystal is studied, along with its effects on the second-harmonic generation (SHG) of a high-average-power laser. A comprehensive model is proposed incorporating principles of thermodynamics, mechanics, and optics, and it is applied to investigate the temperature nonuniformity and its effects. The temperature rise caused by linear absorption is calculated, while the temperature nonuniformity occurring during the cooling process is analyzed using the finite-element method (FEM). The stress induced by the nonuniformity is then studied using the FEM, and the trend of its change is determined. Moreover, the changes in refractive index caused by the stress are calculated, the results of which are used to determine the variations in the induced phase mismatch. The SHG efficiency considering the phase mismatch is eventually obtained by solving the coupling wave equations. The results demonstrate that the temperature nonuniformity has negative effects on the SHG efficiency.

© 2014 Optical Society of America

OCIS Codes
(140.3580) Lasers and laser optics : Lasers, solid-state
(140.6810) Lasers and laser optics : Thermal effects
(190.0190) Nonlinear optics : Nonlinear optics
(190.2620) Nonlinear optics : Harmonic generation and mixing

ToC Category:
Nonlinear Optics

History
Original Manuscript: May 16, 2014
Revised Manuscript: July 4, 2014
Manuscript Accepted: July 4, 2014
Published: August 4, 2014

Citation
Yingchun Liang, Ruifeng Su, Lihua Lu, and Haitao Liu, "Temperature nonuniformity occurring during the cooling process of a KDP crystal and its effects on second-harmonic generation," Appl. Opt. 53, 5109-5116 (2014)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-53-23-5109


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