20 October 2005 Design and fabrication of refractive and diffractive micro optical elements used in holographic recording setups
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Abstract
The uniform illumination of holographic screens during their recording process is commonly realized by using only the quasi-constant, inner part of the gaussian intensity profile of a very strongly expanded laser beam. This technique is characterized by a very low efficiency (about 5%, depending on the required uniformity). We present a method, which uses refractive, micro optical beamshaping elements in order to create a rectangular, extraordinarily uniform, flat-top intensity profile with minimal phase aberrations. This allows the use of about 80%-90% of the provided optical power for the illumination of the holographic screen. To ensure the required quality of the illumination wave, a spatial frequency filtering has to be applied. For certain holographic applications, requiring a combination of high beam-divergence and high optical power, conventional pinholes are either too thin or too sensitive. To solve this problem, we present a new concept of dielectric pinholes, based on optical microstructures. The combination of beamshaping elements and dielectric pinholes allowed us to extend the available parameter range during the recording of holograms.
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T. Kaempfe, T. Kaempfe, E.-B. Kley, E.-B. Kley, A. Tuennermann, A. Tuennermann, } "Design and fabrication of refractive and diffractive micro optical elements used in holographic recording setups", Proc. SPIE 5965, Optical Fabrication, Testing, and Metrology II, 596503 (20 October 2005); doi: 10.1117/12.625195; https://doi.org/10.1117/12.625195
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