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.
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Project supported by the National Natural Science Foundation of China (No. 60778001), and the National Basic Research Program (973) of China (No. 2007CB307003)
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Xu, Hb., Wu, B., Cai, Ss. et al. Analysis on spectral gain characteristics of PPMgLN based quasi-phase-matching optical parametric amplification. J. Zhejiang Univ. Sci. A 10, 601–606 (2009). https://doi.org/10.1631/jzus.A0820192
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DOI: https://doi.org/10.1631/jzus.A0820192
Key words
- Spectral gain full width at half maximum (FWHM)
- Quasi-phase matching (QPM)
- Optical parametric conversion
- PPMgLN