Abstract
Back conversion is an intrinsic phenomenon in nonlinear frequency
down-conversion processes. However, the physical reason for its occurrence
is not well understood. Here, we theoretically reveal that back conversion
is the result of a π-phase jump associated with the depletion of one
interacting wave. By suppressing the idler phase jump through a deliberate
crystal absorption, the back conversion can be inhabited, thus enhancing
the conversion efficiency from the pump to the signal. The results
presented in this Letter will further the understanding of nonlinear
parametric processes and pave the way toward the design of highly
efficient down-conversion systems.
© 2017 Chinese Laser Press
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