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Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering)  2009, Vol. 10 Issue (4): 601-606    DOI: 10.1631/jzus.A0820192
Optical Engineering     
Analysis on spectral gain characteristics of PPMgLN based quasi-phase-matching optical parametric amplification
Hai-bin XU, Bo WU, Shuang-shuang CAI, Yong-hang SHEN
State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou 310027, China
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Abstract  A deep understanding of the spectral gain characteristics of optical parametric oscillators (OPOs) and optical parametric amplifiers (OPAs) is important for a highly efficient optical parametric conversion. We numerically calculated the spectral gain characteristics of a quasi-phase-matching (QPM) parametric conversion process using the periodically poled 6% (mol/mol) MgO doped LiNbO3 (PPMgLN) as the nonlinear crystal. In the simulation we utilized the approach of a transformative matrix of the periodically poled nonlinear medium, which results from the small-signal approximation of three-wave mixed nonlinear equations. Numerical simulation results show that: (1) The full width at half maximum (FWHM) of the spectral gain of the parametric process becomes wider with the increase of parametric wavelength and reaches the maximum at degeneration; (2) The gain coefficient decreases gradually with the increase of parametric wavelength; (3) The spectral gain bandwidth decreases correspondingly with the increase of the nonlinear material length; (4) There exists an optimal parametric wavelength band, which is most suitable for the high gain parametric conversion when pumped by a laser source with a wide wavelength band, such as the high power fiber laser.

Key wordsSpectral gain full width at half maximum (FWHM)      Quasi-phase matching (QPM)      Optical parametric conversion      PPMgLN     
Received: 17 March 2008     
CLC:  O437.4  
  TN201  
Cite this article:

Hai-bin XU, Bo WU, Shuang-shuang CAI, Yong-hang SHEN. Analysis on spectral gain characteristics of PPMgLN based quasi-phase-matching optical parametric amplification. Journal of Zhejiang University-SCIENCE A (Applied Physics & Engineering), 2009, 10(4): 601-606.

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http://www.zjujournals.com/xueshu/zjus-a/10.1631/jzus.A0820192     OR     http://www.zjujournals.com/xueshu/zjus-a/Y2009/V10/I4/601

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