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Proceedings Paper

Utilization of plastic windows for large-dimension CO2 laser beam transmission
Author(s): Bernard Gautier; Rene C. Joeckle; Fabrice Lacroix
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Paper Abstract

Thin plastic films can be used as cheap protective windows for large dimensions, low mean power density CO2 laser optics. Polyethylene (PE) sheets with a typical thickness of 0.1 to 0.5 mm must be able to transmit a 30 kW, Gaussian shaped, one meter spot sized beam during 10 seconds prior to melting. Experiments at reduced scale with a 1.8 kW laser beam have been performed. A 0.4 mm thick PE window transmits 73% of the incident power (with a maximum intensity of 11 W/cm2) for more then the required 10 s, provided a low speed air blowing is applied. Nevertheless, an analysis of the transmitted intensity profiles exhibits peaks and spreading with respect to the incident power distribution. This diffusion effect has been more accurately studied in this paper.

Paper Details

Date Published: 4 May 1993
PDF: 4 pages
Proc. SPIE 1810, 9th International Symposium on Gas Flow and Chemical Lasers, (4 May 1993); doi: 10.1117/12.144599
Show Author Affiliations
Bernard Gautier, French-German Research Institute of Saint-Louis (France)
Rene C. Joeckle, French-German Research Institute of Saint-Louis (France)
Fabrice Lacroix, French-German Research Institute of Saint-Louis (France)


Published in SPIE Proceedings Vol. 1810:
9th International Symposium on Gas Flow and Chemical Lasers

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