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Sidelobe suppression of spectral response in holographic optical filter |
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| Authors: | Alexei K. Zajtsev Shiuan Huei Lin Ken Yuh Hsu |
| Affiliation: | a Institute of Electro-Optical Engineering, National Chiao Tung University, 1001 TA Hsueh Road, Hsinchu 30050, Taiwan, ROC b Department of Electrophysics, National Chiao Tung University, 1001 TA Hsueh Road, Hsinchu 30050, Taiwan, ROC |
| Abstract: | In order to suppress sidelobes of holographic filter’s spectral response we propose to use weighting of grating intensity distribution along light propagation. This can be realized in photorefractive material (for example in LiNbO3:Fe) by using spatial selective decaying of conventional uniform grating by illumination of light through some transparent mask. Experimental results show that it is able to obtain 8 dB improvement of sidelobe level compared to uniform grating. But it is accompanied by 1.7 times expansion of main lobe and two times decrease of diffraction efficiency. |
| Keywords: | Holographic grating Optical filter Photorefractive media |
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