Details
| Original language | English |
|---|---|
| Title of host publication | Femtosecond Phenomena and Nonlinear Optics III |
| Publication status | Published - 29 Sept 2006 |
| Externally published | Yes |
| Event | Femtosecond Phenomena and Nonlinear Optics III - Stockholm, Sweden Duration: 11 Sept 2006 → 12 Sept 2006 |
Publication series
| Name | Proceedings of SPIE - The International Society for Optical Engineering |
|---|---|
| Volume | 6400 |
| ISSN (Print) | 0277-786X |
Abstract
The power handling capability of optical components is still one of the most important limitations for the further improvement of ultra-short pulse lasers in respect of average power and pulse energy. Laser-induced damage of functional dielectric coatings on laser crystals, pockels cells, out-coupling polarizers and compressor gratings is severely inhibiting the wide dispersion of ultra-short pulse laser systems especially in industrial production environments. Since the underlying physical causes for laser-induced damage with ultra-short pulses are distinctly differing from those in the nanosecond time scale, novel approaches must be found for an unambiguous improvement in damage resistance of optical coatings. In previous investigations, the band-gap of the coating material and the maximum field strength in the layer stack were identified as most important influences on the laser-induced damage with ultra-short pulses. Furthermore, a significant nonlinear increase of absorptance in dielectric coatings was found to be strongly related to the band-gap of the material. These effects were traced back to the multi-photon and avalanche-ionization as driving mechanisms for producing a critical conduction band population. In the current investigations, numerous model layer systems were investigated concerning laser-induced damage and non-linear absorptance. Adapting the ion beam sputtering coating process for achieving co-deposition of high and low index materials, coatings with continuously tunable refractive indices were produced. The results of the experiments exhibit a strong correlation of the damage threshold to the controllable shifting band-gaps of the coating materials.
Keywords
- Graded-index coatings, Ion beam sputtering, ISO 11254, ISO 11551, Laser-induced damage threshold, Non-linear absorptance
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Physics and Astronomy(all)
- Condensed Matter Physics
- Computer Science(all)
- Computer Science Applications
- Mathematics(all)
- Applied Mathematics
- Engineering(all)
- Electrical and Electronic Engineering
Cite this
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Femtosecond Phenomena and Nonlinear Optics III. 2006. 640008 (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 6400).
Research output: Chapter in book/report/conference proceeding › Conference contribution › Research › peer review
}
TY - GEN
T1 - Non-linear laser-induced damage and absorptance effects in dielectric coatings by using ultra-short pulses
AU - Starke, Kai
AU - Jupé, Marco
AU - Jensen, Lars
AU - Mädebach, H.
AU - Lappschies, Marc
AU - Ristau, Detlev
AU - Ostendorf, Andreas
PY - 2006/9/29
Y1 - 2006/9/29
N2 - The power handling capability of optical components is still one of the most important limitations for the further improvement of ultra-short pulse lasers in respect of average power and pulse energy. Laser-induced damage of functional dielectric coatings on laser crystals, pockels cells, out-coupling polarizers and compressor gratings is severely inhibiting the wide dispersion of ultra-short pulse laser systems especially in industrial production environments. Since the underlying physical causes for laser-induced damage with ultra-short pulses are distinctly differing from those in the nanosecond time scale, novel approaches must be found for an unambiguous improvement in damage resistance of optical coatings. In previous investigations, the band-gap of the coating material and the maximum field strength in the layer stack were identified as most important influences on the laser-induced damage with ultra-short pulses. Furthermore, a significant nonlinear increase of absorptance in dielectric coatings was found to be strongly related to the band-gap of the material. These effects were traced back to the multi-photon and avalanche-ionization as driving mechanisms for producing a critical conduction band population. In the current investigations, numerous model layer systems were investigated concerning laser-induced damage and non-linear absorptance. Adapting the ion beam sputtering coating process for achieving co-deposition of high and low index materials, coatings with continuously tunable refractive indices were produced. The results of the experiments exhibit a strong correlation of the damage threshold to the controllable shifting band-gaps of the coating materials.
AB - The power handling capability of optical components is still one of the most important limitations for the further improvement of ultra-short pulse lasers in respect of average power and pulse energy. Laser-induced damage of functional dielectric coatings on laser crystals, pockels cells, out-coupling polarizers and compressor gratings is severely inhibiting the wide dispersion of ultra-short pulse laser systems especially in industrial production environments. Since the underlying physical causes for laser-induced damage with ultra-short pulses are distinctly differing from those in the nanosecond time scale, novel approaches must be found for an unambiguous improvement in damage resistance of optical coatings. In previous investigations, the band-gap of the coating material and the maximum field strength in the layer stack were identified as most important influences on the laser-induced damage with ultra-short pulses. Furthermore, a significant nonlinear increase of absorptance in dielectric coatings was found to be strongly related to the band-gap of the material. These effects were traced back to the multi-photon and avalanche-ionization as driving mechanisms for producing a critical conduction band population. In the current investigations, numerous model layer systems were investigated concerning laser-induced damage and non-linear absorptance. Adapting the ion beam sputtering coating process for achieving co-deposition of high and low index materials, coatings with continuously tunable refractive indices were produced. The results of the experiments exhibit a strong correlation of the damage threshold to the controllable shifting band-gaps of the coating materials.
KW - Graded-index coatings
KW - Ion beam sputtering
KW - ISO 11254
KW - ISO 11551
KW - Laser-induced damage threshold
KW - Non-linear absorptance
UR - http://www.scopus.com/inward/record.url?scp=33846235508&partnerID=8YFLogxK
U2 - 10.1117/12.690421
DO - 10.1117/12.690421
M3 - Conference contribution
AN - SCOPUS:33846235508
SN - 0819464988
SN - 9780819464989
T3 - Proceedings of SPIE - The International Society for Optical Engineering
BT - Femtosecond Phenomena and Nonlinear Optics III
T2 - Femtosecond Phenomena and Nonlinear Optics III
Y2 - 11 September 2006 through 12 September 2006
ER -