Adaptive extracavity beam shaping for application in nanosecond laser micromachining

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The typical Gaussian intensity distribution generated at focus of a laser machining workstation is not always ideal for the application; instead other shapes such as ellipses, flat-tops (circular or square), or doughnuts can in some cases give better results. Also, other more complex beam profiles might be beneficial for surface micro structuring. In order to realise, and rapidly change between such beam shapes, we are investigating an adaptive optics approach based on using an iterative simulated annealing algorithm to control the actuators of a deformable mirror. A 37-element piezoelectric deformable mirror and a 37-element bimorph mirror were applied in an extracavity arrangement. Beam shaping results with these systems are presented and example laser machining is demonstrated in this paper. The results enabled by the deformable mirrors are compared to previous results using a spatial light modulator (SLM) based on a liquid crystal microdisplay. The SLM has a much higher resolution and enables complex beam shapes to be generated, however is much slower in response. Having an active beam shaping element incorporated in a laser machining workstation adds increased flexibility and improves process control. © 2011 SPIE.

Original languageEnglish
Title of host publicationLaser Resonators and Beam Control XIII
Volume7913
DOIs
Publication statusPublished - 2011
EventQuantum Sensing and Nanophotonic Devices VIII - San Francisco, CA, United States
Duration: 23 Jan 201127 Jan 2011

Conference

ConferenceQuantum Sensing and Nanophotonic Devices VIII
CountryUnited States
CitySan Francisco, CA
Period23/01/1127/01/11

Keywords

  • Beam shaping
  • Deformable mirror
  • Laser micromachining

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