Waves of reflection and conduction in ZnS, ZnSe, and Ge irradiated by single pulse of CO2 laser as a possible tool of precatastrophic damage indications

Eugene M. Kudriavtsev; Sebastian Lefranc; Michel L. Autric

doi:10.1117/12.307005

20 April 1998 Waves of reflection and conduction in ZnS, ZnSe, and Ge irradiated by single pulse of CO2 laser as a possible tool of precatastrophic damage indications

Eugene M. Kudriavtsev, Sebastian Lefranc, Michel L. Autric

Author Affiliations +

Proceedings Volume 3244, Laser-Induced Damage in Optical Materials: 1997; (1998) https://doi.org/10.1117/12.307005
Event: Laser-Induced Damage in Optical Materials: 1997, 1997, Boulder, CO, United States

Abstract

Waves of reflection and conduction (WRC) was found in 1992 as a new reversible photoinduced phenomenon. Here WRC was studied for IR transparent semiconductors ZnS, ZnSe, Ge in the process of optical damage testing of this materials. It was measured the variations of reflected or transmitted beam intensity of the He-Ne and CO₂ lasers when WRC pulses generated on the front and rear sample surfaces moved through the sample with velocities of order of sound velocity v₁ and approximately 1/4, 1/8, 1/16, 1/32 of v₁ with many reflections. This WRC pulses realize some part of non stationer heat transfer in solids. This WRC component velocities increased up to 2 times with the sample focus region temperature increasing as an effect of the energy pulse growing and different levels of damage occurring. It gives the possibility to develop the technique for the remote nondestructive precatastrophic indications of damage. This work was sponsored by DRET and as project 97- 02-17954 by RFBR.

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Eugene M. Kudriavtsev, Sebastian Lefranc, and Michel L. Autric "Waves of reflection and conduction in ZnS, ZnSe, and Ge irradiated by single pulse of CO2 laser as a possible tool of precatastrophic damage indications", Proc. SPIE 3244, Laser-Induced Damage in Optical Materials: 1997, (20 April 1998); https://doi.org/10.1117/12.307005

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KEYWORDS

Germanium

Zinc

Carbon dioxide lasers

Gas lasers

Nondestructive evaluation

Optical damage

Optical testing

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