Interaction of high-power infrared radiation with germanium

D. Seo; L. C. Feldman; N. H. Tolk; P. I. Cohen

doi:10.1117/12.816611

30 December 2008 Interaction of high-power infrared radiation with germanium

D. Seo, L. C. Feldman, N. H. Tolk, P. I. Cohen

Proceedings Volume 7132, Laser-Induced Damage in Optical Materials: 2008; 713216 (2008) https://doi.org/10.1117/12.816611
Event: Boulder Damage Symposium XL Annual Symposium on Optical Materials for High Power Lasers, 2008, Boulder, Colorado, United States

Abstract

We have observed and characterized wavelength-dependent laser damage thresholds in crystalline germanium induced by trains of high-power infrared picosecond laser pulses at wavelengths ranging from 2.8 μm to 5.2 μm, using the Vanderbilt Free-Electron Laser. In this wavelength range, photon energies are well below the band-gap energy. As the wavelength is increased, threshold fluences are observed to increase by a factor of five over the studied wavelength range. Two- and three- photon absorption is the predominant photon energy absorption mechanism up to 4.4 μm. At wavelengths above 4.8 μm tunnel absorption appears to be the primary absorption mechanism. Wavelength and fluence dependent transmission and reflection measurements provide valuable insight into the nature of the damage mechanisms.

Citation Download Citation

D. Seo, L. C. Feldman, N. H. Tolk, and P. I. Cohen "Interaction of high-power infrared radiation with germanium", Proc. SPIE 7132, Laser-Induced Damage in Optical Materials: 2008, 713216 (30 December 2008); https://doi.org/10.1117/12.816611

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