Special Section on Laser Damage III

Femtosecond laser-induced damage threshold of electron beam deposited dielectrics for 1-m class optics

[+] Author Affiliations
Adrien Hervy

Reosc (SAFRAN Group), 91280 Saint-Pierre-du-Perray, France

Aix Marseille Université, CNRS, Centrale Marseille, Institut Fresnel, UMR 7249, 13397 Marseille, France

ENSTA, Laboratoire d’Optique Appliquée, Ecole Polytechnique, CNRS UMR 7639, 91761 Palaiseau, France

Laurent Gallais

Aix Marseille Université, CNRS, Centrale Marseille, Institut Fresnel, UMR 7249, 13397 Marseille, France

Gilles Chériaux

ENSTA, Laboratoire d’Optique Appliquée, Ecole Polytechnique, CNRS UMR 7639, 91761 Palaiseau, France

Daniel Mouricaud

Reosc (SAFRAN Group), 91280 Saint-Pierre-du-Perray, France

Opt. Eng. 56(1), 011001 (Jun 30, 2016). doi:10.1117/1.OE.56.1.011001
History: Received December 13, 2015; Accepted April 12, 2016
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Abstract.  In order to transport multi-petawatt (PW) femtosecond laser beams with large spectral bandwidth, specific mirrors have to be designed and manufactured. We report on an experimental study of the laser-damage resistance and other optical properties of coating materials deposited in a 1-m class coating chamber. The study is conducted on single-layer coatings deposited by electron beam evaporation at 500 fs. Based on the experience of large optics for nanosecond applications, hafnia and silica are particularly investigated. However, in the case of sub-15 fs, the spectral specifications for PW beam transport mirrors cannot be reached by classical high laser-resistant quarter-wave SiO2/HfO2 stacks. Therefore, we investigate the laser resistance of different dielectrics of interest deposited with electron-beam processes: Al2O3, Y2O3, Sc2O3, HfO2, Ta2O5, TiO2. The influence of multiple pulse irradiations and environmental conditions, such as vacuum and temperature, is studied. With the investigation of multilayer stacks, we also show that there is no difference in behavior when a film is studied as a single layer or embedded in a stack. Based on these results, we were able to optimize high reflective (>99.5%), broadband (300 nm) and high laser-induced damage threshold (2.5  J/cm2) mirrors for PW applications.

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© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Adrien Hervy ; Laurent Gallais ; Gilles Chériaux and Daniel Mouricaud
"Femtosecond laser-induced damage threshold of electron beam deposited dielectrics for 1-m class optics", Opt. Eng. 56(1), 011001 (Jun 30, 2016). ; http://dx.doi.org/10.1117/1.OE.56.1.011001


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