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Coherent enhancement of broadband frequency up-conversion in BBO crystal by shaping femtosecond laser pulses |
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| Authors: | Shian Zhang Xiangyun Zhang Jianhua Huang Li Deng Zhenrong Sun Weiping Zhang Zugeng Wang Zhizhan Xu |
| Institution: | a Key Laboratory of Optical and Magnetic Resonance Spectroscopy, Ministry of Education, East China Normal University, No. 3663 Zhongshan North Road, Shanghai 200062, PR China b Department of Physics, East China Normal University, No. 3663 Zhongshan North Road, Shanghai 200062, PR China c Department of Mathematics, East China Normal University, No. 3663 Zhongshan North Road, Shanghai 200062, PR China d State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, PR China |
| Abstract: | An optimal feedback control of broadband frequency up-conversion in BBO crystal is experimentally demonstrated by shaping femtosecond laser pulses based on genetic algorithm, and the frequency up-conversion efficiency can be enhanced by ∼16%. SPIDER results show that the optimal laser pulses have shorter pulse-width with the little negative chirp than the original pulse with the little positive chirp. By modulating the fundamental spectral phase with periodic square distribution on SLM-256, the frequency up-conversion can be effectively controlled by the factor of about 17%. The experimental results indicate that the broadband frequency up-conversion efficiency is related to both of second harmonic generation (SHG) and sum frequency generation (SFG), where the former depends on the fundamental pulse intensity, and the latter depends on not only the fundamental pulse intensity but also the fundamental pulse spectral phase. |
| Keywords: | 42 65 Ky 42 65 Re 32 80 Qk |
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