Fabrication of Near-Infrared Volume Phase Holographic Grism with High Efficiency and High Dispersion,and Its Application to a Wavelength De-multiplexing Device |
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Authors: | Kaoru Nakajima Yuki Komai Eriko Watanabe Fumi Moritsuka Shimako Anzai Kashiko Kodate |
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Affiliation: | (1) Faculty of Science, Japan Women's University, 2-8-1 Mejirodai, Bunkyo-ku, Tokyo 112-8681, Japan |
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Abstract: | We designed and developed a volume phase holographic (VPH) grism with high resolution and high efficiency in the near-infrared light domain (1550 nm) to be applied as a wavelength de-multiplexing device of a photonic network. In order to achieve both diffraction efficiency of over 80% and wavelength resolution of 0.08 nm, we newly designed and fabricated a VPH grism with high efficiency and high wavelength resolution in near-infrared wavelength region by sandwiching a VPH grating between prisms. An active feedback control technique was introduced to a two-beam interference exposure system, and we also applied it to a wavelength de-multiplexing device for a photonic network. Consequently, a VPH grism was successfully fabricated with diffraction efficiency of over 80% by employing the Bragg condition of 1550 nm at the incident wavelength from 1530 to 1570 nm, and high refractive index modulation of 0.047 was confirmed. |
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Keywords: | VPH grism near-infrared VPH grating phase-control technique photonic network wavelength de-multiplexing device |
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