The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 09, 1988
Filed:
Sep. 09, 1986
Michel A Duguay, Fair Haven, NJ (US);
Joseph S Weiner, Summit, NJ (US);
American Telephone and Telegraph Company, AT&T Bell Laboratories, Murray Hill, NJ (US);
Abstract
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.0.5 Sr.sub.0.5 F.sub.2, the core region consists of three substantially monocrystalline layers (108 nm Al.sub.0.4 Ga.sub.0.6 As/92.5 nm Ca.sub.0.5 Sr.sub.0.5 F.sub.2 /120 nm Al.sub.0.78 Ga.sub.0.22 As), and the top cladding region is Ta.sub.2 O.sub.5), with the subset consisting of the 108 nm nonlinear layer.