4 August 1998 Improvement on spatial resolution of relief holograms in dichromated gelatin
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Cleaving-etch method was presented for improving relief modulation resolution in gelatin. The principle of the method was introduced. Using the cleaving-etch method, a sine relief grating was obtained with 200 lines/mm spatial frequency and 0.4 micrometers relief depth. Comparison between enzyme-etching-imaging method and the cleaving-etch method was given and the reason why resolution of the latter much higher than the former was presented.
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Lin Pang, Lin Pang, Jianhua Zhu, Jianhua Zhu, Yongqun Zeng, Yongqun Zeng, Hong Xiao, Hong Xiao, Lurong Guo, Lurong Guo, } "Improvement on spatial resolution of relief holograms in dichromated gelatin", Proc. SPIE 3559, Holographic Displays and Optical Elements II, (4 August 1998); doi: 10.1117/12.318476; https://doi.org/10.1117/12.318476

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