Abstract
Laser beam profilers are extensively used to visualize the intensity distribution in the laser beam. In this way, diagnostic information is available to the laser operator making it possible to perform troubleshooting in case of poor laser performance. In this paper, a new beam splitting device for diagnostic purposes is described. The splitting is based on creating a diffraction grating in the air of the beam delivery path. For an acoustic wave in the 1 MHz-region interacting with a CO 2 laser beam at 10.6 μm wavelength, this leads to Bragg diffraction since the Klein-Cook parameter is 14. The beam diffracted off the grating is used as a beam monitor and is typically a factor 10 6 lower in power than the main beam.
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