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Numerical model and study of cascaded third harmonic generation in two-sectioned a periodically poled Mg-doped LiTaO3 structure

J. Appl. Phys. 106, 093106 (2009); doi:10.1063/1.3253749

Published 6 November 2009

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Oleg A. Louchev1 and Satoshi Wada2
1Megaopto Co. Ltd., RIKEN Cooperation Center W414, 2-1 Hirosawa, Wako, Saitama 351-0106, Japan
2Solid-State Optical Science Research Unit, RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
The feasibility of cascaded second harmonic generation (SHG) and third harmonic generation (THG) in a monolithic two-sectioned periodically poled lithium tantalate crystal is analyzed. Simulation using a computational nonlinear optical model rigorously coupled with a thermal model suggests that 25%–30% THG efficiency can be achieved for a 3 W 20 ns pulsed 1.064  µm laser operating at 10 kHz if the crystal is composed of two sections: (i) [approximate]8.0  µm period first-order SHG structure and (ii) [approximate]6.6  µm period third-order THG structure. Significant inhibition of THG efficiency arises due to absorption of SH and TH, the heat release along the crystal, and associated thermal dephasing and lensing which can be effectively compensated by decreasing the temperature of the operating crystal below the quasiphase matching temperature. Corrections for the energy exchange lengths for optimal SHG and THG section design are suggested. ©2009 American Institute of Physics
History: Received 2 April 2009; accepted 29 September 2009; published 6 November 2009
Permalink: http://link.aip.org/link/?JAPIAU/106/093106/1
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KEYWORDS and PACS

Keywords
PACS
  • 42.65.Ky
    Optical frequency conversion; harmonic generation
  • 61.72.up
    Doping and impurity implantation in other materials
  • YEAR: 2009

PUBLICATION DATA

ISSN:
0021-8979 (print)   1089-7550 (online)
Publisher:
AIP is a member of CrossRef AIP

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