Single-shot laser beam profiling using multilevel imaging (Abstract Only)

Andrew M. Scott; Simon C. Woods; Paul Harrison

doi:10.1117/12.472398

30 May 2003 Single-shot laser beam profiling using multilevel imaging (Abstract Only)

Andrew M. Scott, Simon C. Woods, Paul Harrison

Proceedings Volume 4932, Laser-Induced Damage in Optical Materials: 2002 and 7th International Workshop on Laser Beam and Optics Characterization; (2003) https://doi.org/10.1117/12.472398
Event: XXXIV Annual Symposium on Optical Materials for High Power Lasers: Boulder Damage Symposium, 2002, Boulder, CO, United States

Abstract

We describe a compact laser beam profiler that records multiple images of a laser beam at different positions along the beam waist in a single shot. This is used to determine the laser beam parameter M². It is known that if light is incident on a curved grating such as a section of a Fresnel zone plate, then the +1 and -1 diffracted orders are focused or defocused. By combining two curved gratings and a conventional lens, it is possible to build a system in which a mosaic of nine images are created, corresponding to nine separate object planes. These nine images can be processed and fitted to an appropriate beam profile. This type of system measures beam quality in real time without any moving parts, and has the potential to provide real time monitoring of pulsed lasers, lasers with dynamic spatial behaviour, and in systems where beam handling optics may produce transient aberrations. Unlike other 'single shot' techniques, this technique makes no assumptions about beam propagation, and produces a value of M² based only on measurements of beam waists.

Citation Download Citation

Andrew M. Scott, Simon C. Woods, and Paul Harrison "Single-shot laser beam profiling using multilevel imaging (Abstract Only)", Proc. SPIE 4932, Laser-Induced Damage in Optical Materials: 2002 and 7th International Workshop on Laser Beam and Optics Characterization, (30 May 2003); https://doi.org/10.1117/12.472398

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KEYWORDS

Laser optics

Profiling

Optical testing

Pulsed laser operation

Beam quality measurement

Image processing

Laser beam propagation

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