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Direct Fabrication Methods of Surface Relief Electro-Optic Gratings in Azo-Polymer Films |
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| Authors: | Katsuhiro Munakata Kenji Harada Nobukazu Yoshikawa Masahide Itoh Shinsuke Umegaki Toyohiko Yatagai |
| Institution: | (1) Institute of Applied Physics, University of Tsukuba and Tsukuba Advanced Research Alliance, 1-1-1, Tennodai, Tsukuba, Ibaraki 305-8573, Japan;(2) Faculty of Science and Engineering, Keio University, 3-14-1, Hiyoshi, Kohoku, Yokohama, Kanagawa 223-0061, Japan |
| Abstract: | Two fabrication methods of surface relief electro-optic (EO) gratings in azo-polymer films are described: surface deformation by a continuous wave laser and laser ablation by a pulse laser. In the fabrication process, the periodic intensity modulation of laser beams is formed by an interference fringe or a phase mask. The surface relief EO grating is fabricated by poling the surface relief grating (SRG) after the SRG fabrication process. The linear dependence of an applied voltage in the modulation efficiency of the first-order diffraction beam is observed. The proposed methods are effective for highly-efficient surface relief EO grating fabrication. |
| Keywords: | electro-optic grating surface relief grating azo-polymer film electro-optic effect laser ablation |
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