Application of room-temperature infrared photo detectors in high-speed laser beam diagnostics of industrial CO2 lasers

Details Application of room-temperature infrared photo detectors in high-speed laser beam diagnostics of industrial CO2 lasers Application of room-temperature infrared photo detectors in high-speed laser beam diagnostics of industrial CO2 lasers

Apr 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995spie.2375..142h&link_type=abstract

Proc. SPIE Vol. 2375, p. 142-153, Beam Control, Diagnostics, Standards, and Propagation, Lindsay W. Austin; Adolf Giesen; Daniel

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The paper presents applications of newly developed room-temperature mercury based photo- detectors (single-element and array type) in the measurement of infrared CO2 laser radiation during material processing. A specially designed measuring device to determine the intensity profile of high-power CO2 lasers in two perpendicular cross-sections with a time- resolution up to 10 kHz for a whole line-scan is presented. The data-acquisition and analyzing equipment based on a digital-signal-processor (DSP) enables us to calculate parameters which characterize the temporal stability of the laser mode on-line. Experimental results illustrate the possibilities of the device. Moreover, the time-resolved measurement of laser beam parameters during material processing serves as a tool to investigate the influence of the laser beam on the dynamic process behavior. Optical signals obtained from the laser beam welding process are correlated with laser beam power variations to determine the grade of interaction.

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