Nonlinear directional coupler in periodically poled lithium niobate.
Nonlinear wave propagation was investigated experimentally in coupled waveguides by means of the cascaded nonlinearity in quasi-phase-matched second-harmonic generation. With a specially designed wave-vector-mismatch distribution along the propagation axis, cascading was optimized for low fundamental depletion. High-contrast, ultrafast all-optical switching with switching powers of tens of watts was observed.
Schiek
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R
School of Optics and Center for Research and Education in Optics and Lasers, University of Central Florida, 4000 Central Florida Boulevard, Orlando, Florida 32816-2700, USA.
Friedrich
L
L
Fang
H
H
Stegeman
G I
GI
Parameswaran
K R
KR
Chou
M H
MH
Fejer
M M
MM