Details
| Original language | English |
|---|---|
| Title of host publication | Laser-Induced Damage in Optical Materials 2023 |
| Editors | Christopher Wren Carr, Detlev Ristau, Carmen S. Menoni, Michael D. Thomas |
| Publisher | SPIE |
| Number of pages | 7 |
| ISBN (electronic) | 9781510666818 |
| Publication status | Published - 24 Nov 2023 |
| Event | 55th Annual Laser Damage Symposium - Laser-Induced Damage in Optical Materials 2023 - Dublin/Livermore, United States Duration: 17 Sept 2023 → 21 Sept 2023 |
Publication series
| Name | Proceedings of SPIE - The International Society for Optical Engineering |
|---|---|
| Volume | 12726 |
| ISSN (Print) | 0277-786X |
| ISSN (electronic) | 1996-756X |
Abstract
Nonlinear absorption is mainly governed by mechanisms involving excitation processes of electrons. Typically, two phenomena are considered when discussing nonlinear absorption; the multiphoton absorption where multiple photons interact directly with a single electron, and tunnel ionization, where the high electric field results in a shifting of the bandgap allowing an electron to tunnel into the conduction band. Electrons in the conduction band can be accelerated through the absorption of further photons until they obtain enough energy to excite further electrons to the conduction band, leading to runaway absorption and finally damage of the sample. By laser calorimetric measurement of the nonlinear absorption, it is expected that the laser damage threshold can be predicted without damaging the optic. Before accurate predictions can be made, the process must be thoroughly characterized and understood. The nonlinear behavior of the absorption was demonstrated with potential increases in absorption of an order of magnitude. Initial results show a noticeable impact of contaminants, though a nonlinear response is still observed.
Keywords
- avalanche ionization, Keldysh, Laser Calorimetric Absorption, Laser Induced Damage Threshold, LCA, LIDT, Nonlinear Absorption
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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- BibTeX
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Laser-Induced Damage in Optical Materials 2023. ed. / Christopher Wren Carr; Detlev Ristau; Carmen S. Menoni; Michael D. Thomas. SPIE, 2023. 127260J (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 12726).
Research output: Chapter in book/report/conference proceeding › Conference contribution › Research › peer review
}
TY - GEN
T1 - Determining the bandgap dependence of nonlinear absorption and laser induced damage threshold through numerical simulation and experiment
AU - McCauley, Joshua
AU - Ji, Xiaochuan
AU - Jupé, Marco
AU - Zhang, Jinlong
AU - Wienke, Andreas
AU - Ristau, Detlev
N1 - Funding Information: The authors would like to thank DFG, German Research Foundation for funding this work under Sino German collaboration in project "Fast Coatings" (No. 448756425.) and under Germany's Excellence Strategy within the Cluster of Excellence PhoenixD (EXC 2122, Project ID 390833453).
PY - 2023/11/24
Y1 - 2023/11/24
N2 - Nonlinear absorption is mainly governed by mechanisms involving excitation processes of electrons. Typically, two phenomena are considered when discussing nonlinear absorption; the multiphoton absorption where multiple photons interact directly with a single electron, and tunnel ionization, where the high electric field results in a shifting of the bandgap allowing an electron to tunnel into the conduction band. Electrons in the conduction band can be accelerated through the absorption of further photons until they obtain enough energy to excite further electrons to the conduction band, leading to runaway absorption and finally damage of the sample. By laser calorimetric measurement of the nonlinear absorption, it is expected that the laser damage threshold can be predicted without damaging the optic. Before accurate predictions can be made, the process must be thoroughly characterized and understood. The nonlinear behavior of the absorption was demonstrated with potential increases in absorption of an order of magnitude. Initial results show a noticeable impact of contaminants, though a nonlinear response is still observed.
AB - Nonlinear absorption is mainly governed by mechanisms involving excitation processes of electrons. Typically, two phenomena are considered when discussing nonlinear absorption; the multiphoton absorption where multiple photons interact directly with a single electron, and tunnel ionization, where the high electric field results in a shifting of the bandgap allowing an electron to tunnel into the conduction band. Electrons in the conduction band can be accelerated through the absorption of further photons until they obtain enough energy to excite further electrons to the conduction band, leading to runaway absorption and finally damage of the sample. By laser calorimetric measurement of the nonlinear absorption, it is expected that the laser damage threshold can be predicted without damaging the optic. Before accurate predictions can be made, the process must be thoroughly characterized and understood. The nonlinear behavior of the absorption was demonstrated with potential increases in absorption of an order of magnitude. Initial results show a noticeable impact of contaminants, though a nonlinear response is still observed.
KW - avalanche ionization
KW - Keldysh
KW - Laser Calorimetric Absorption
KW - Laser Induced Damage Threshold
KW - LCA
KW - LIDT
KW - Nonlinear Absorption
UR - http://www.scopus.com/inward/record.url?scp=85181151154&partnerID=8YFLogxK
U2 - 10.1117/12.2685160
DO - 10.1117/12.2685160
M3 - Conference contribution
AN - SCOPUS:85181151154
T3 - Proceedings of SPIE - The International Society for Optical Engineering
BT - Laser-Induced Damage in Optical Materials 2023
A2 - Carr, Christopher Wren
A2 - Ristau, Detlev
A2 - Menoni, Carmen S.
A2 - Thomas, Michael D.
PB - SPIE
T2 - 55th Annual Laser Damage Symposium - Laser-Induced Damage in Optical Materials 2023
Y2 - 17 September 2023 through 21 September 2023
ER -