Cylindrical wave of reflection and conduction in IR transparent BaF2 single crystal excited by 2.5 <mu>s duration pulse of CO2 laser

Eugene M. Kudriavtsev; Franck Guignard; G. Inglesacis; Michel L. Autric

doi:10.1117/12.307007

20 April 1998 Cylindrical wave of reflection and conduction in IR transparent BaF₂ single crystal excited by 2.5-μs-duration pulse of CO₂ laser

Eugene M. Kudriavtsev, Franck Guignard, G. Inglesacis, Michel L. Autric

Author Affiliations +

Proceedings Volume 3244, Laser-Induced Damage in Optical Materials: 1997; (1998) https://doi.org/10.1117/12.307007
Event: Laser-Induced Damage in Optical Materials: 1997, 1997, Boulder, CO, United States

Abstract

Experiments on optical damage testing by help of 2.5 microsecond(s) , approximately 0.1 J single pulse of 10.6 (mu) CO₂ laser showed the appearance of cylindrical geometry WRC in BaF₂ single crystal approximately 50 percent transparent for this radiation. It was measured the reflection variations of the He-Ne beam transmitted through the sample at the 30 degree angle to the IR laser axes and crossing it. The nonequilibrium heating of the sample along IR beam axes produced the heat lens and as a consequence the focusing of the He-Ne beam. The cylindrical WRC cross the focused He-Ne beam area and it gives the well pronounced bell shape peak, additional to the analogous reflection variation records made at conditions where He-Ne beam did not cross IR laser axes. The time of focused He-Ne beam crossing by WRC is 40 ms, which correspond to approximately 0.6 mm diameter of focused a beam. One can make conclusions about local optical constants changing inside of solid sample by help of reflection variations in WRC. This work was sponsored by RFBR.

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Eugene M. Kudriavtsev, Franck Guignard, G. Inglesacis, and Michel L. Autric "Cylindrical wave of reflection and conduction in IR transparent BaF₂ single crystal excited by 2.5-μs-duration pulse of CO₂ laser", Proc. SPIE 3244, Laser-Induced Damage in Optical Materials: 1997, (20 April 1998); https://doi.org/10.1117/12.307007

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