Optical waveguide device and second harmonic generator using the

Details Optical waveguide device and second harmonic generator using the Optical waveguide device and second harmonic generator using the

1994-02-08

1995-10-17

Healy, Brian

Optical waveguides

Planar optical waveguide

385 14, 385122, 385130, 385131, 385132, 385 28, 359326, 359332, 359328, G02B 612

Patent

active

054598079

ABSTRACT:
An optical waveguide device for use as a second harmonic generator includes a nonlinear optical crystalline substrate of KTiOPO.sub.4 and an optical waveguide core of a dielectric material, such as Ta.sub.2 O.sub.5, disposed on the nonlinear optical crystalline substrate. The optical waveguide converts a fundamental wave having a wavelength .lambda. which is guided through the optical waveguide into a second harmonic wave having a wavelength .lambda./2, the second harmonic wave having the same polarization as the fundamental wave which is guided through the optical waveguide. The optical waveguide has a thickness of 190 nm or greater. The optical waveguide device also has a dielectric loaded strip disposed on the optical waveguide core. The dielectric loaded strip may be made of SiO.sub.2 or SiO.sub.2 doped with Ta.sub.2 O.sub.5. Alternatively, the optical waveguide may be a ridge-type optical waveguide, and the optical waveguide device may also has a cladding layer disposed on the nonlinear optical crystalline substrate and the optical waveguide core.

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Patent Abstracts of Japan, vol. 11, No. 375, 8 Dec. 1987, Taniuchi Tetsuo et al. "Optical Wavelength Converter".
Applied Physics Letters, vol. 58, No. 1, pp. 19-21 7 Jan. 1991, W. P. Risk "Fabrication and characterization of planar ion-exchanged KTiOPO.sub.4 waveguides for frequency doubling".

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