Optical multilayer structures for harmonic laser emission

DETAILED DESCRIPTION Briefly stated, a broad bandwidth optical multilayer structure for harmonic laser emission according to the present invention includes an optical waveguide for propagating light in one dimension under a guiding condition.
The waveguide is made of more than one layer of an optically non-linear semiconductor materials and all the layers are parallel to the dimension.
Light injection means are provided for injecting into the waveguide along the dimension contra-propagating lights of fundamental wavelengths to produce a harmonic light in a direction different from the dimension and determined by the mutual relationship of the contra-propagating lights.
The locations and the thicknesses of the layers and their refractive indices are chosen approximately according to the modified Fourier transform of the following equation; ##EQU1## wherein S is proportional to radiated harmonic field, P.
sup.
NL (y') is nonlinear polarization field induced by the waveguided fundamentals, n(y') is the refractive index at position y', and k.
sub.
0 is the wavevector of radiated field in air so as to provide the multilayer structure with a predetermined interaction bandwidth.