Phase matching limitation of high-efficiency second-harmonic generation in both phase- and group-velocity-matched structures |
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Authors: | Wei Han Wan-Guo Zheng Yi-Sheng Yang Ding-Xiang Cao Qi-Hua Zhu Lie-Jia Qian |
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Affiliation: | aLaser Fusion Research Center, CAEP, Mianyang, Sichuan 621900, China;bDepartment of Optical Science and Engineering, Fudan University, Shanghai 200433, China |
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Abstract: | In this paper, we studied efficient second-harmonic generation (SHG) of femtosecond pulses in both phase- and group-velocity-matched structures. Obtained results show that phase matching becomes more critical under conditions required for high levels of conversion efficiency. And the imperfect phase mismatch caused by mismatched group-velocity dispersion (GVD) will limit conversion efficiency as well as bandwidth of generated second-harmonic (SH) pulses. The spectral characteristics of the generated SH pulses and its conversion efficiency in the strong pump regime are investigated in detail. The acceptance bandwidth of nonlinear crystal in the high-efficiency SHG is redefined in the paper, and the definition is much closer to the practical application of design. |
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Keywords: | Frequency conversion Femtosecond pulses Group-velocity dispersion |
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