18 August 2000 Beam-shaping elements for holographic applications
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Proceedings Volume 4179, Micromachining Technology for Micro-Optics; (2000) https://doi.org/10.1117/12.395687
Event: Micromachining and Microfabrication, 2000, Santa Clara, CA, United States
Abstract
Recording holographic optical elements usually requires a good illumination uniformity as well as a spherical or plane phase. To fulfill the uniformity demand, an expansion of the Gaussian beam is necessary. This leads to a loss of intensity connected with an essential extension of the recording time. Alternatively, the recording efficiency can be increased by using a beam transformation the beam from a Gaussian into a top hat intensity distribution. We designed, realized and tested a setup for a more efficient hologram recording which can be used for full color application. The heart of the setup is a refractive beam shaping element fabricated by a gray tone lithography and proportional transfer into quartz glass. The beam shaping element shows a conversion efficiency of $GTR99,5% (like a refractive lens) in the whole visible spectral range and an intensity uniformity <5%RMS.
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Ernst-Bernhard Kley, Matthias Cumme, Lars-Christian Wittig, Mike Thieme, Werner Gabler, "Beam-shaping elements for holographic applications", Proc. SPIE 4179, Micromachining Technology for Micro-Optics, (18 August 2000); doi: 10.1117/12.395687; https://doi.org/10.1117/12.395687
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