USE OF A DISPERSIVE OPTICAL ELEMENT AS A SPECTRAL RECOMBINER FOR AN ADVANCED VOLUME HOLOGRAM FILTER (AVHF) AND OPTICAL IMAGING SYSTEMS EMPLOYING SUCH FILTER
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United States of America
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Mar 6, 2025
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Mar 25, 2024
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Mar 25, 2024
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Abstract
Addition of a light-recombiner in the form of a diffraction grating to an advanced-volume-hologram filter system (conventionally containing only a pre-disperser diffraction grating and a volume holographic filter VHF configured as a volume Bragg grating, VBG) demonstrated recollimation and spatial overlap of light components at different wavelengths in addition to the spectral bandwidth optimization and signal-to-noise improvement. Here, the wide spectral bandwidth is ensured by the angular Bragg-matching of the pre-disperser with the VBG. The signal-to-noise improvement is obtained by the wavefront selectivity of the VBG. The cancellation of the spectral dispersion is achieved by the light-recombiner. Utilization of a light-recombiner in the form of a diffraction grating as opposed to another dispersive optic such as an optical prism additionally eliminates the potential for spatial chirp that normally reduces the usability of the conventional AVHF system in optical imaging applications.
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