Abstract
Several years ago Stegeman and Normandin predicted, and subsequently demonstrated [1], the nonlinear mixing of oppositely propagating guided waves. The resultant second harmonic field was coupled to radiation modes and propagated in a direction perpendicular to the waveguide surface, in the case of equal fundamental frequencies. Its application to picosecond signal processing [2], the creation of all optical transient digitizers [3] and spectrometers [4] demonstrated the potential usefulness of this approach. Finally, the nonlinear cross section for uniform GaAs optical waveguides was calculated and published [5], and recently this GaAs prediction was verified [6] by Vakhsoori et al. In their geometry, the oppositely propagating beam was supplied by the reflection from the exit surface. Their use of picosecond pulses also demonstrated the potential for optical correlation in a geometry similar to references 2 and 3. However, the use of simple GaAs films results in low conversion efficiencies, due to difficult input coupling and absorption and phase cancellation effects at the harmonic wavelength.
© 1994 Optical Society of America
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