13 June 1989 Single Aperture Multi-Spectral Reticle Projector
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Abstract
The optical design presented here is capable of projecting the image of two different reticles, in two different spectral regions, through a single exit aperture. The reticle projections can then be viewed by a single instrument capable of operating in either spectral region. The system features coaxial reticles for boresight stability between the two projections, broadband transmissive optics which allow the sharing of optical paths in the two spectral regions, a single exit aperture, a double pass of the shorter waveband projector (which helps minimize the number of required optical components) and a dichroic lens coating which allows for independent control of the optical parameters in the two spectral regions. The spectral regions of the two reticle projections can be any two regions in which broadband transmissive optics and dichroic lens coatings are available. The application that brought forth this design required the projection of a visible reticle and an infrared reticle (3.0 to 5.0 gm) and much of the discussion will be based on these two spectral regions.
© (1989) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Robert J Brown, David Michika, "Single Aperture Multi-Spectral Reticle Projector", Proc. SPIE 1049, Recent Trends in Optical Systems Design and Computer Lens Design Workshop II, (13 June 1989); doi: 10.1117/12.951411; https://doi.org/10.1117/12.951411
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