Optical waveguide and second harmonic generator

Details Optical waveguide and second harmonic generator Optical waveguide and second harmonic generator

1989-10-20

1991-06-11

Lee, John D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

350 9614, 307427, G02B 612

Patent

active

050227297

ABSTRACT:
An optical waveguide apparatus arranged such that a Ta.sub.2 O.sub.5 -TiO.sub.2 system amorphous thin film is formed on a substrate. This optical waveguide apparatus can perform optical waveguiding at high efficiency. Also, an optical waveguide-type second harmonic generator of Cerenkov radiation type arranged such that the amorphous thin film is formed on a non-linear optical crystal substrate. This optical waveguide-type second harmonic generator can efficiently perform the confinement of light, whereby a fundamental wave of near-infrared rays can be received and a second harmonic wave radiated to the substrate side can be obtained with high efficiency. Further, in a second harmonic generator (SHG) in which the amorphous optical waveguide is formed on an LiNbO.sub.3 non-linear optical crystal substrate on which surface is formed a periodically-poled region, this second harmonic generator can very efficiently generate a light having a wavelength of half of a semiconductor laser light of 0.8 micrometer band by selecting a relationship between a periodically-poled region cycle .LAMBDA. and a thickness h of an optical waveguide.

REFERENCES:
patent: 3935472 (1976-01-01), Bethea et al.
patent: 4763019 (1988-08-01), Duguay et al.
patent: 4859876 (1989-08-01), Dirk et al.
Applied Physics Letters, "Phase-Matched Second-Harmonic Generation in Solid Thin Films Using Modulation of the Nonlinear Susceptibilities", vol. 28, No. 11, Jun. 1, 1976, pp. 651-653.
IBM Technical Disclosure Bulletin, "Second Harmonic Generator with Semiconductor Lasers", vol. 24, No. 1B, Jun. 1981, pp. 681-682.
Applied Physics Letters, "Optical Second Harmonic Generator in Form of Coherent Cerenkov Radiation from a Thin-Film Waveguide", vol. 17, No. 10, Nov. 15, 1970, pp. 447-450.

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