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Optical wavelength-converting device for guided-wave second- harmonic generation in Cerenkov radiation mode
Optical wavelength-converting device for guided-wave second- harmonic generation in Cerenkov radiation mode
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机译:用于切伦科夫辐射模式下的导波二次谐波产生的光波长转换装置
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摘要
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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