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31 May 2005 Dichroic beamsplitter for a dual-wavelength camera in a long-range airborne reconnaissance system
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There is a growing need for dual band cameras in airborne reconnaissance systems having simultaneous operation in the 0.5-0.9 μm and 3-5 μm spectral bands. The dual band requirement stems from considerations of system performance and cost as well as installation on the platform. Airborne reconnaissance cameras require optical systems with long focal length and large apertures in the 3-5 mm wavelength IR region. A large optical system conflicts with the limitations of weight and volume often associated with long-range reconnaissance platforms. A dual-waveband airborne telescope and camera system has been developed by El-Op Ltd. This system provides high-resolution images in the thermal IR at night and simultaneous IR and visible images during day. It offers low weight, compact size and high dimensional stability over a wide range of environmental conditions. To enable the operation of the dual band, a unique dichroic beam splitter with special coating and broad band anti-reflection coating was developed for optimization of the transmittance in each band. The optical design of the telescope, the coating and its performance will be presented in the paper.
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Dov Freiman, Zinovy Elgart, and Arie Chernoborov "Dichroic beamsplitter for a dual-wavelength camera in a long-range airborne reconnaissance system", Proc. SPIE 5783, Infrared Technology and Applications XXXI, (31 May 2005); doi: 10.1117/12.606820;


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