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4 June 2003 Single-element holographic nonspatial filter
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Abstract
We have previously described a holographic laser apparatus that 'cleans up' a laser beam by discarding off-axis rays. The device uses two matched holograms carefully oriented with respect to one another so that the Bragg effect from the first hologram cleans up first one direction and then the second hologram cleans up the orthogonal direction. The device works well and reduces the beam divergence to 0.8 mrad with a 3.0 mm thick hologram. However, there are practical difficulties with this configuration including sensitivity to the mutual alignment of the holograms and a cleaned-up beam which is inconveniently not in the same horizontal plane as the input laser beam. We describe here a much simpler design using a single hologram that improves performance and avoids these difficulties.
© (2003) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jacques E. Ludman, Timothy D. Upton, and Daniel Coolidge "Single-element holographic nonspatial filter", Proc. SPIE 5005, Practical Holography XVII and Holographic Materials IX, (4 June 2003); doi: 10.1117/12.487975; https://doi.org/10.1117/12.487975
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