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.
All Science Journal Classification (ASJC) codes
- Atomic and Molecular Physics, and Optics
Bollanti, S., Di Lazzaro, P., & Murra, D. (2006). Performance of a zoom homogenizer for reshaping coherent laser beams. Optics Communications, 264(1), 174 - 179. https://doi.org/10.1016/j.optcom.2006.02.026