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21 August 2009 Diffractive laser beam shaping for holography
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Abstract
Laser applications that demand a high quality with long coherence length are limited by the Gaussian profile of the fundamental TEM00 mode. Many of these applications require a uniform irradiance profile with a flat phase-front. In holography, both phase and intensity are critical to the process. Near-field beam shaping optics, also called beam transformers, re-map an input Gaussian profile to a top-hat profile. The top-hat profile is created at some working distance away from the shaping element where a corrector element has traditionally been placed in order to flatten the phase of the top-hat profile and allow it to propagate as a nominally collimated beam. This paper will discuss the theory to support the use of a diffractive optical element in holography and other applications where the phase is important. Two different geometric beam shapes will be explored, round and square profiles.
© (2009) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Kurt Kanzler and Andrew Stockham "Diffractive laser beam shaping for holography", Proc. SPIE 7430, Laser Beam Shaping X, 743006 (21 August 2009); https://doi.org/10.1117/12.828494
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