Million Fold Enhancement Of Surface Emitting Harmonic Generation In Semiconductor Waveguides

Several years ago Stegeman and Normandin predicted and demonstrated the nonlinear mixing of oppositely propagating guided waves. The resultant field was coupled to radiation modes and propagated in a direction perpendicular tot he waveguide surface in the case of equal frequency fundamentals. Its application to picosecond signal processing, the creation of an all-optical transient digitizer and crude spectrometer ⁽¹⁾ demonstrated the potential usefulness of this interaction. Finally the nonlinear cross section was evaluated for a symmetric GaAs waveguide structure ⁽²⁾. Recent works has also apparently rediscovered this geometry and experimentally verified the GaAs calculations ⁽³⁾.