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Light intensity modulation element, intensity-modulated-light generating device, laser exposure unit and photograph processing apparatus
Light intensity modulation element, intensity-modulated-light generating device, laser exposure unit and photograph processing apparatus
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机译:光强度调制元件,强度调制光产生装置,激光曝光单元和照片处理设备
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摘要
Disclosed is a light-intensity modulation element, which comprises a substrate made of a nonlinear optical crystal, and a light waveguide formed in a principal surface of the substrate to extend in one direction. The light waveguide includes first and second wavelength conversion portions for converting a part of infrared light introduced into the light waveguide to a second harmonic. Each of the first and second wavelength conversion portions has a plurality of polarization structures serially disposed in the longitudinal direction of the light waveguide in such a manner that their polarities in the thickness direction of the substrate are inverted periodically and alternately in the longitudinal direction of the light waveguide. The light waveguide further includes a phase adjustment portion located between the first and second wavelength conversion portions, and associated with a pair of electrodes disposed in opposed relation to one another on opposite sides thereof. The light-intensity modulation element of the present invention can modulate a light intensity in a compact structure and with enhanced efficiency of conversion to second harmonics.
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