Abstract
Cascaded sum-frequency-generation (SFG) and difference-frequency-generation
(DFG) can implement a wavelength conversion between arbitrary combinations
of input and output signal wavelengths. By using a tunable wavelength pump
light, the output wavelength can be tuned to a desired wavelength. As in many
wavelength conversion devices using the nonlinear optical effect, the group
velocity difference between light pulses with different wavelength causes
a walk-off effect deforming the output pulse shape. Thus, the device length
should be kept short to avoid the walk-off effect resulting in limited conversion
efficiency. In this report, we propose a method, for quasi-phase matched device,
to maintain the pulse shape of the SFG light pulse along the propagation distance.
The output DFG light pulse deformation is suppressed and the conversion efficiency
can be increased by extending the device length.
© 2009 IEEE
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