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.
© (2005) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
T. Kaempfe, E.-B. Kley, and 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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