Optimal design of the grating with reflective plate of comb type for astronomical observation using RCWA

Details Optimal design of the grating with reflective plate of comb type for astronomical observation using RCWA Optimal design of the grating with reflective plate of comb type for astronomical observation using RCWA

Jun 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004spie.5290..168o&link_type=abstract

Practical Holography XVIII: Materials and Applications. Edited by Jeong, Tung H.; Bjelkhagen, Hans I. Proceedings of the SPI

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The star formation distribution and internal movement in the Galaxy is the key variable to probe into the evolution and formation process of the Galaxy. To this end, the diffraction grating is required, which can achieve high dispersion and efficiency by direct vision grating in a wide visible wavelength region. We propose a grism that fulfills consisting of two prisms and a diffraction grating with comb-like thin reflective plates arranged in parallel. A beam of light reflected by this grism on a reflective plate spreads in the diffractive distribution determined by wavelength and grating period. In the case where high order diffraction light is employed, the structure is designed such that the highest possible efficiency is given to the wavelength at the order that satisfies interference conditions in the positive direction of the reflective plate. We design and calculated by using the program based on the Rigorous Coupled Wave Analysis (RCWA) in order to obtain the optimum conditions for high efficiency of 80% in a wide wavelength region by using the grism with high-order diffraction.

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