21 February 2014 Wide spectral range imaging acousto-optic turnable filter used in outer space probe
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This article introduces a wide spectral range imaging acousto-optic turnable filter made of two transducers. “Mismatch rate” was firstly put forward to represent the degree to which the impedance mismatch and a three stage matching circuit was designed for the filter to improve its spectral range and operating bandwidth. Now the spectral range is from 0.4μm to 1.1μm, the overall operating bandwidth reaches 1.14 octave, the diffraction efficiency over 60%, spectral resolution from 1.3nm to 7.5nm. To get rid of “ tin pest”, alloy material was used to make bonding layer material instead of pure tin, making the storage temperature of the acousto-optic turnable filter ranges from -65 °C to 85 °C, and the operating temperature from -35 °C to 70 °C.
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Zehong Zhang, Zehong Zhang, Liangqiu Wang, Liangqiu Wang, Xiaoliang He, Xiaoliang He, Yong Zhou, Yong Zhou, "Wide spectral range imaging acousto-optic turnable filter used in outer space probe", Proc. SPIE 9142, Selected Papers from Conferences of the Photoelectronic Technology Committee of the Chinese Society of Astronautics: Optical Imaging, Remote Sensing, and Laser-Matter Interaction 2013, 914214 (21 February 2014); doi: 10.1117/12.2057536; https://doi.org/10.1117/12.2057536

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