Joseph G Weiner Deceased1099 22Nd St, Washington, DC 20037

4763019, Aug 9, 1988

Sep 9, 1986

6/905278

Michel A. Duguay - Fair Haven NJ
Joseph S. Weiner - Summit NJ

American Telephone and Telegraph Company, AT&T Bell Laboratories - Murray Hill NJ

H03F 700

307427

Disclosed is apparatus comprising a source of pump radiation, a multilayer planar waveguide structure that can serve as an efficient harmonic generator, parametric amplifier or parametric oscillator, and means for utilizing the radiation generated in the waveguide structure. The structure consists of a multilayer core region bounded above and below by a (typically optically linear) cladding region. The core region comprises two optically nonlinear layers separated by an optically linear spacer. The layer thickness and refractive indices are selected such that, at a pump frequency f. sub. o, the effective index of the core region is greater than the respective refractive indices of the cladding regions, that the refractive indices of the two nonlinear layers are greater than the refractive index of the spacer, and that a predetermined mode of pump radiation is phasematched with a predetermined mode of a second radiation at a frequency. noteq. f. sub. o, with more than 50% of the total energy of the second frequency radiation propagating in a subset of the layers of the core region that does not comprise the spacer and one of the two nonlinear layers. In an exemplary embodiment, the bottom cladding region is a substantially monocrystalline layer of approximate composition Ca. sub. 5 Sr. sub. 5 F. sub.