Performance of a zoom homogenizer for reshaping coherent laser beams

S. Bollanti, P. Di Lazzaro, D. Murra

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Abstract

We have reshaped the TEM00beam emitted by a diode-pumped Nd-Yag laser by means of an optical homogenizer with zoom. The laser beam, first enlarged up to a size of (100 × 37.5) mm2, is homogenized and resized to a final dimension continuously adjustable from (130 × 4.5) mm2up to (130 × 52) mm2. We measured the plateau uniformity, the root mean square fluctuation and the edge steepness of the beam according to the ISO standard definitions, showing a poor reliability of the above parameter values due to the definitions themselves, and propose an amendment to overcome this problem. We obtained a very sharp edge steepness, but the spatial coherence of the laser beam put a lower limit to the high-frequency intensity fluctuations on the plateau region of the homogenized beam. Finally, we discuss the optimum homogenizer design for spatially coherent laser beams, including the depth of focus issue. © 2006 Elsevier B.V. All rights reserved.
Original languageEnglish
Pages (from-to)174 - 179
Number of pages6
JournalOptics Communications
Volume264
Issue number1
DOIs
Publication statusPublished - 1 Aug 2006
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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