Holographic Gratings Fabrication and Applications

• Main Authors: Jian Chiang Shyu, 徐堅鏹
• Other Authors: Allen J. Whang
• Format: Others
• Language: zh-TW
• Published: 1993
• Online Access: http://ndltd.ncl.edu.tw/handle/93517601101104177090

碩士 === 國立臺灣科技大學 === 工程技術研究所 === 81 === Among diffractive elements, gratings have been broadly on various applications. In this paper, we therefore discuss how to make high efficiency gratings by holographic method. We use coupled-wave theory to analyze how diffraction angle and efficiency are affected by grating period, fringe slanted angle, refraction index and absorption coefficent of holo- graphic grating.Besides, we study how to design the grating period to " select " the wavelength and control the diffrac- tion angle. Fabrication details are also explored in the pa- per. We successfully made a digital holographic grating image, and analyzed various dispersion phenomena of the grating image . We then designed a diffractive system which is capable of making grating cells on a 4"*5" hologram. The grating period of each cell can be arbitrarily chosed to meet the wavelength selection and diffraction angle requirements. The fabrication process of digital holograms can thus be automated by our system.