Improved phase hologram design for generating symmetric light spots and its application for laser writing of waveguides |
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| Authors: | Sakakura Masaaki Sawano Tsutomu Shimotsuma Yasuhiko Miura Kiyotaka Hirao Kazuyuki |
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| Affiliation: | Kyoto University Office of Society-Academia Collaboration for Innovation, Kyoto, 615-8520, Japan. msakakura@saci.kyoto-u.ac.jp |
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| Abstract: | The improved method for calculation of a phase hologram and its application to laser writing of waveguides with a spatial light modulator are presented. It was found that the amplitude and phase distributions of light spots generated by a phase hologram can be distorted compared to those of a focused single beam. The distortion of light spots could be reduced by adding a simple constraint, in which light intensities around a light spot should be as small as possible, to the conventional calculation method of a phase hologram. It was also demonstrated that the improved calculation method can be considered essential for laser writing of waveguides. |
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