Variable coupling rotational wand for on‐line laser beam sampling

As power levels of industrial lasers increase, effective determination of beam profiles over extended operational regimes becomes problematic, due to dynamic range limitations of available detectors. To address this deficiency, a variable coupling rotating wand was developed for on‐line monitoring o...

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Bibliographic Details
Published in:Review of scientific instruments 1993-09, Vol.64 (9), p.2482-2487
Main Authors: Sellathamby, C. V., Seguin, H. J. J., Akitt, D. R., Reshef, H.
Format: Article
Language:English
Subjects:
Beam characteristics: profile, intensity, and power
spatial pattern formation
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Gas lasers including excimer and metal-vapor lasers
Laser optical systems: design and operation
Lasers
Optics
Physics
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Summary:As power levels of industrial lasers increase, effective determination of beam profiles over extended operational regimes becomes problematic, due to dynamic range limitations of available detectors. To address this deficiency, a variable coupling rotating wand was developed for on‐line monitoring of output radiation from high average power CO2 lasers. The concept features real‐time beam sampling adjustment, activated by wand rotational speed change. An associated controller provides appropriate speed regulation of the wand motor drive, via a computer generated setpoint. Design parameters thereby ensure optimal sensor operation at all power levels. A safety override prevents sensor damage by terminating laser operation, if wand speed decreases below a safe value.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.1143907