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Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 26,
  • Issue 17,
  • pp. 3090-3097
  • (2008)

Enhanced Cascaded SHG+DFG Process of Femtosecond Pulses Using Chirp Quasi-Phase Matching Waveguide

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Abstract

This study presents a chirp quasi-phase matching (QPM) waveguide to increase the conversion efficiency of the cascaded SHG+DFG effect for femtosecond pulses. The coupled mode theory is used to analyze the cascaded SHG+DFG process. In this paper, a constructive interference zone (or cascaded SHG+DFG region) is defined as when the conversion wave and its coupling component constructively interfere with each other and have a phase difference ranging from $0$ to $0.5\pi$ or from $1.5 $ to $2\pi$. On the other hand, the region is called a destructive interference zone (or back conversion region) when the phase difference ranges from $0.5 $ to $1.5\pi$. The proposed chirp QPM waveguide is designed to extend constructive interference length and shorten destructive interference length over the waveguide. The simulation results demonstrate that for a pulsewidth of 0.6 ps, the maximum conversion efficiency of a 50-mm chirp QPM waveguide can be increased to 25 times that of a uniform QPM waveguide.

© 2008 IEEE

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