Optical waveguides – Having nonlinear property
Patent
1991-03-01
1992-05-12
Lee, John D.
Optical waveguides
Having nonlinear property
359328, 359332, 385129, 385131, G02B 610, G02F 137
Patent
active
051134691
ABSTRACT:
An optical wavelength-converting device for generating the second-harmonic wave through Cerenkov radiation has a substrate made from nonlinear optical crystal which acts as a cladding layer. Formed on the top surface of the substrate is a long, narrow optical waveguide layer, whose refractive index is larger than that of the substrate. In the substrate, multi-layered domain-inverted sections are formed. With this arrangement, the nonlinear coefficient is locally changed, thereby compensating for phase mismatching between the fundamental wave and the second-harmonic wave in the direction perpendicular to the substrate's surface. This compensation helps improve the efficiency in converting the laser input light of the fundamental wave into the second-harmonic wave.
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Hatakoshi Gen-ichi
Kawachi Masaru
Terashima Kazutaka
Uematsu Yutaka
Kabushiki Kaisha Toshiba
Lee John D.
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