Volume phase gratings for spectroscopy, ultrafast laser compressors, and wavelength division multiplexing

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Abstract
Volume phase (VP) gratings are now available and being applied to the applications of astronomical spectroscopy, Raman spectroscopy, ultrafast lasers, and wavelength division multiplexers. A volume phase grating results from the recording of an interferometric pattern within the volume of a material which, when suitably processed, becomes a modulation of the material's index of refraction. When a VP grating is substantially illuminated, the light interacts with the material due tot he recorded pattern. Light propagates within and out of the VP grating according to Bragg diffraction. Definitions of various VP gratings designed and fabricated to study performance are provided as relating to the applications listed above. Performance parameters include diffraction efficiency, spectral coverage, and angular coverage. Descriptions of the test methods are given. Performance data is provided and compared to the respective design.

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