Ga. Melkov et al., Nonadiabatic interaction of a propagating wave packet with localized parametric pumping - art. no. 066607, PHYS REV E, 6306(6), 2001, pp. 6607
The interaction of a propagating wave packet (carrier frequency omega. wave
number k) with nonadiabatic parametric pumping, localized in a region of s
ize the order of the carrier wavelength L similar to lambda =2 pik, is stud
ied experimentally in a system of dipolar spin waves in a ferrite film. It
is shown that the three-wave parametric interaction omega+ omega' = omega (
p) leads to the formation of both contrapropagating (k' = -k) and copropaga
ting (k' =k) idle wave packets of carrier frequency omega'. A system of equ
ations derived for the packet envelopes gives a quantitative description of
the observed random modulation of the output signal caused by the interfer
ence of the input and copropagating idle wave packets.