Abstract
An improved version of a photoacoustic beam profiler of pulsed lasers is presented. The new model resorts to high-bandwidth condenser microphones to register higher-order, excited acoustic modes, thus enabling more accurate profiling. In addition, Xe was used as a buffer gas since its high atomic weight further reduces the eigenfrequencies. Furthermore, a new gas-handling system makes up for some deficiencies found in the first model. The system was calibrated using the Airy pattern generated with a pinhole illuminated by a frequency-doubled Nd:YAG laser that excited $$\text{ NO }_{2}$$ traces. Once calibrated, the beam profile of a TEA $$\text{ CO }_{2}$$ laser was obtained, using ethylene as the absorbing species. This profiler returns more accurate profiles than thermal paper.
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