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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