Influence of Cascaded Nonlinear Phase Shifts on Second-Harmonic Generation in High-Intensity Pumped QPM Structures
ZHANG Dong-Fang, QIAN Lie-Jia, WANG Ke, ZHU He-Yuan
State Key Laboratory for Advanced Photonic Materials and Devices, Department of Optical Science and Engineering, Advanced Materials Laboratory, Fudan University, Shanghai 200433
Influence of Cascaded Nonlinear Phase Shifts on Second-Harmonic Generation in High-Intensity Pumped QPM Structures
ZHANG Dong-Fang, QIAN Lie-Jia, WANG Ke, ZHU He-Yuan
State Key Laboratory for Advanced Photonic Materials and Devices, Department of Optical Science and Engineering, Advanced Materials Laboratory, Fudan University, Shanghai 200433
Cascaded nonlinear phase shifts may be imposed on the interacting waves during second-harmonic generation (SHG) in a quasi-phase-matched (QPM) structure, which are severe in high-intensity regime and may result in lower conversion efficiency. We propose a configuration of QPM structure with reduced domain-length, which may depress the nonlinear phase shifts to some extent and lead to an improvement on the conversion efficiency. The numerical analyses on the conversion efficiency as well as the relative phase angle are discussed in detail for better understanding of the SHG process.
Cascaded nonlinear phase shifts may be imposed on the interacting waves during second-harmonic generation (SHG) in a quasi-phase-matched (QPM) structure, which are severe in high-intensity regime and may result in lower conversion efficiency. We propose a configuration of QPM structure with reduced domain-length, which may depress the nonlinear phase shifts to some extent and lead to an improvement on the conversion efficiency. The numerical analyses on the conversion efficiency as well as the relative phase angle are discussed in detail for better understanding of the SHG process.
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2008, Vol. 25 
