Advanced RPE PPLN Waveguide Applications: Beyond SHG and Uniform QPM Gratings
نویسندگان
چکیده
Apodization of linearly chirped QPM gratings in periodically-poled lithium niobate For second harmonic generation (SHG), it has been shown that the transfer function of a quasi-phasematched (QPM) device is directly related to the Fourier transform of its grating function [1]. For a uniform grating of finite length, this results in a sinc2 response of the SH signal as a function of fundamental wavelength with its center determined by the material dispersion and QPM period, and its width (SH bandwidth) given by the length of the grating; the longer the grating, the narrower the SH bandwidth.
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