Measurement of the intensity distribution of laser radiation using Bragg diffraction of light

The necessary, estimates were obtained and it was demonstrated experimentally that the Bragg diffraction of light by ultrasonic waves in air may be used to measure the intensity distribution of laser radiation. A transducer utilizing an X-cut quartz crystal was developed to implement this technique. Measurements were made of the angular distribution of the ultrasonic field and its divergence was determined as 4×10^–3 rad at 0.9 MHz. In order to confirm this possibility, measurements were made of the laser radiation distribution at λ = 0.6328 μ in the incident and Bragg-diffracted radiation.