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Proceedings Paper

Theoretical analysis of general approach realizing phase matched second-harmonic generation in LiNbO3 waveguides
Author(s): Jian Wang; Junqiang Sun
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Paper Abstract

Theoretical analysis on phase matched second-harmonic generation (SHG) in a more general manner is presented from the viewpoint of modulation of the nonlinear coefficient. The conventional quasi-phase matching (CQPM) is firstly analyzed, showing a noticeable result that the intensity of second-harmonic wave grows most rapidly at odd times of half Lc, i.e., Lc/2, 3Lc/2, 5Lc/2, etc., but most slowly at even times of half Lc, i.e., 0, Lc, 2Lc, 3Lc, etc. Based on which, a new scheme to realize phase matched SHG by modulating the nonlinear coefficient using alternating "+", "0", "-", "0" every Lc/2 is proposed with the analytical expressions for conversion efficiency (η) and conversion bandwidth (ΔFWHM) derived. Compared with CQPM, it is found that the same ΔFWHM approximately 5.566/L, and at the same time, a much more effective η can be achieved when ignoring partial waveguide in which the nonlinear coefficient is "0", however, when considering it there is a 3dB penalty for η. Furthermore, a much more general scheme to realize phase matched SHG is proposed, also using alternating "+", "0", "-", "0" but with variable duty cycle. We present the analytical expressions for η and ΔFWHM , with the result showing that ΔFWHM keeps constant, i.e., 5.566/L. In addition, the fabrication tolerances are discussed, and our proposed scheme exhibits a better performance.

Paper Details

Date Published: 10 June 2006
PDF: 7 pages
Proc. SPIE 6344, Advanced Laser Technologies 2005, 63441E (10 June 2006); doi: 10.1117/12.694405
Show Author Affiliations
Jian Wang, Huazhong Univ. of Science and Technology (China)
Junqiang Sun, Huazhong Univ. of Science and Technology (China)


Published in SPIE Proceedings Vol. 6344:
Advanced Laser Technologies 2005
Ivan A. Shcherbakov; Kexin Xu; Qingyue Wang; Alexander V. Priezzhev; Vladimir I. Pustovoy, Editor(s)

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