21 February 2011 Flattop wideband wavelength converters based on cascaded sum and difference-frequency generation using step-chirped gratings
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Abstract
We investigate the role of step-chirped gratings (SCG) for flattening of conversion efficiency response and enhancing the pump bandwidth in cascaded sum and difference frequency generation (SFG + DFG) with a large pump wavelength difference. To obtain a flat response with maximum efficiency, using SCG instead of uniform grating with the same length, the appropriate critical period shifts are presented for the reasonable number of sections and chirp steps feasible for fabrication. Furthermore, it is shown that adding the section numbers for SCG structure increases the pump bandwidth.
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Amirhossein Tehranchi, Amirhossein Tehranchi, Raman Kashyap, Raman Kashyap, } "Flattop wideband wavelength converters based on cascaded sum and difference-frequency generation using step-chirped gratings", Proc. SPIE 7917, Nonlinear Frequency Generation and Conversion: Materials, Devices, and Applications X, 79171D (21 February 2011); doi: 10.1117/12.875154; https://doi.org/10.1117/12.875154
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