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

Holger Heyn; Ingo Decker; Dirk Martinen; Helmut Wohlfahrt

doi:10.1117/12.206978

17 April 1995 Application of room-temperature infrared photodetectors in high-speed laser beam diagnostics of industrial CO₂ lasers

Holger Heyn, Ingo Decker, Dirk Martinen, Helmut Wohlfahrt

Author Affiliations +

Proceedings Volume 2375, Beam Control, Diagnostics, Standards, and Propagation; (1995) https://doi.org/10.1117/12.206978
Event: Photonics West '95, 1995, San Jose, CA, United States

Abstract

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.

Citation Download Citation

Holger Heyn, Ingo Decker, Dirk Martinen, and Helmut Wohlfahrt "Application of room-temperature infrared photodetectors in high-speed laser beam diagnostics of industrial CO₂ lasers", Proc. SPIE 2375, Beam Control, Diagnostics, Standards, and Propagation, (17 April 1995); https://doi.org/10.1117/12.206978

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