Interaction of high-power infrared radiation with germanium

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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

3 Citations (Scopus)

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.

Original languageEnglish
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
Pages713216
Number of pages1
Volume7132
DOIs
Publication statusPublished - 2008
Event40th Annual Boulder Damage Symposium - Laser-Induced Damage in Optical Materials: 2008 - Boulder, CO, United States
Duration: Sep 22 2008Sep 24 2008

Other

Other40th Annual Boulder Damage Symposium - Laser-Induced Damage in Optical Materials: 2008
CountryUnited States
CityBoulder, CO
Period9/22/089/24/08

Fingerprint

Germanium
Infrared Radiation
infrared radiation
High Power
germanium
Wavelength
Infrared radiation
Interaction
wavelengths
Photon
Photons
interactions
Absorption
photons
fluence
Laser Damage
Energy Absorption
Laser damage
Free Electron Laser
laser damage

Keywords

  • Free-electron laser
  • Germanium
  • Laser induced damage
  • Mid-infrared
  • Transmittance

ASJC Scopus subject areas

  • Applied Mathematics
  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Seo, D., Feldman, L. C., Tolk, N. H., & Cohen, P. I. (2008). Interaction of high-power infrared radiation with germanium. In Proceedings of SPIE - The International Society for Optical Engineering (Vol. 7132, pp. 713216) https://doi.org/10.1117/12.816611

Interaction of high-power infrared radiation with germanium. / Seo, D.; Feldman, Leonard C; Tolk, N. H.; Cohen, P. I.

Proceedings of SPIE - The International Society for Optical Engineering. Vol. 7132 2008. p. 713216.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Seo, D, Feldman, LC, Tolk, NH & Cohen, PI 2008, Interaction of high-power infrared radiation with germanium. in Proceedings of SPIE - The International Society for Optical Engineering. vol. 7132, pp. 713216, 40th Annual Boulder Damage Symposium - Laser-Induced Damage in Optical Materials: 2008, Boulder, CO, United States, 9/22/08. https://doi.org/10.1117/12.816611
Seo D, Feldman LC, Tolk NH, Cohen PI. Interaction of high-power infrared radiation with germanium. In Proceedings of SPIE - The International Society for Optical Engineering. Vol. 7132. 2008. p. 713216 https://doi.org/10.1117/12.816611
Seo, D. ; Feldman, Leonard C ; Tolk, N. H. ; Cohen, P. I. / Interaction of high-power infrared radiation with germanium. Proceedings of SPIE - The International Society for Optical Engineering. Vol. 7132 2008. pp. 713216
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