Ten-year summary of the Boulder Damage Symposium annual thin film laser damage competition

Stolz, Christopher J.; Negres, Raluca A.

doi:10.1117/1.oe.57.12.121910

Cited by 26 publications

(13 citation statements)

References 28 publications

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“…Therefore, these coatings were found to be highly resistant for high-energy nanosecond laser applications. In contrast, dense coatings produced by ion beam sputtering (IBS) have high damage resistance in the fs regime [22]. Besides the type of coating technology, the laser damage resistance of the optical coatings is also dependent on intrinsic properties of coating materials, used laser parameters: wavelength, pulse duration and repetition rate, and coating designs.…”

Section: Introductionmentioning

confidence: 99%

Femtosecond Laser-Induced Damage Characterization of Multilayer Dielectric Coatings

Velpula¹,

Kramer²,

Rus³

2020

Coatings

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The laser-induced damage threshold (LIDT) of optical components is one of the major constraints in developing high-power ultrafast laser systems. Multi-layer dielectric (MLD) coatings-based optical components are key parts of high-power laser systems because of their high damage resistance. Therefore, understanding and characterizing the laser-induced damage of MLD coatings are of paramount importance for developing ultrahigh-intensity laser systems. In this article, we overview the possible femtosecond laser damage mechanisms through damage morphologies in various MLD optical coatings tested in our facility. To evaluate the major contributions to the coating failure, different LIDT test methods (R-on-1, ISO S-on-1 and Raster Scan) were carried out for a high reflective hybrid Ta2O5/HfO2/SiO2 MLD mirror coating at a pulse duration of 37 fs. Different LIDT test methods were compared due to the fact that each test method exposes the different underlying damage mechanisms. For instance, the ISO S-on-1 test at a higher number of laser pulses can bring out the fatigue effects, whereas the Raster Scan method can reveal the non-uniform defect clusters in the optical coating. The measured LIDT values on the sample surface for the tested coating in three test methods are 1.1 J/cm2 (R-on-1), 0.9 J/cm2 (100k-on-1) and 0.6 J/cm2 (Raster Scan) at an angle of incidence of 45 deg. The presented results reveal that the performance of the tested sample is limited by coating defects rather than fatigue effects. Hence, the Raster Scan method is found to be most accurate for the tested coating in evaluating the damage threshold for practical applications. Importantly, this study demonstrates that the testing of different LIDT test protocols is necessary in femtosecond regime to assess the key mechanisms to the coating failure.

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Section: Introductionmentioning

confidence: 99%

Femtosecond Laser-Induced Damage Characterization of Multilayer Dielectric Coatings

Velpula¹,

Kramer²,

Rus³

2020

Coatings

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“…Also, absorption losses in these coatings can increase with nonstoichiometric defects such as oxygen vacancies or electronic defects. , Hence, high-power laser applications require coatings with low absorption and minimal nodular defects. Conventionally, high-reflective (HR) coatings are mainly prepared using PVD techniques. − Several dielectric material combinations have been used for HR coatings such as TiO 2 /SiO 2 , , ZrO 2 /SiO 2 , ,, Nb 2 O 5 /SiO 2 , Al 2 O 3 /SiO 2 , , Ta 2 O 3 /SiO 2 , ,, Ta 2 O 3 /Al 2 O 3 , HfO 2 /SiO 2 , ,,, and HfO 2 /Al 2 O 3 . The 2020 SPIE laser damage symposium evaluated the laser-induced damage threshold (LIDT) of mirrors (deposited with five different PVD methods) at 532 nm wavelength with nanosecond pulses.…”

Section: Introductionmentioning

confidence: 99%

Plasma-Enhanced Atomic Layer Deposition of HfO₂ with Substrate Biasing: Thin Films for High-Reflective Mirrors

Beladiya

Faraz

Schmitt

et al. 2022

ACS Appl. Mater. Interfaces

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“…It is assumed that heating occurs due to the amplification of laser radiation by the nodular defects appearing during the deposition process [13][14][15]. These structural defects are currently considered one of the possible causes of laser induced damage [16][17][18]. In [16], the effect of various types of nodules in the Ta 2 O 5 /SiO 2 coatings on the local absorption of the laser radiation was studied.…”

Section: Introductionmentioning

confidence: 99%

“…This amplification can lead to an increase in the absorption of laser radiation, which affects the value of the LID threshold. In a review paper [18], nodular defects are considered to be the cause of laser induced damage to various types of coatings.…”

Section: Introductionmentioning

confidence: 99%

Molecular Dynamics Simulation of Laser Induced Heating of Silicon Dioxide Thin Films

2021

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The full-atomistic classical molecular dynamics simulation of the laser heating of silicon dioxide thin films is performed. Both dense isotropic films and porous anisotropic films are investigated. It is assumed that heating occurs due to nodal structural defects, which are currently considered one of the possible causes of laser induced damage. It is revealed that heating to a temperature of 1000 K insignificantly affects the structure of the films and the concentration of point defects responsible for the radiation absorption. An increase in the heating temperature to 2000 K leads to the growth of the concentration of these defects. For “as deposited” films, this growth is greater in the case of a porous film deposited at a high deposition angle. Annealing of film reduces the difference in the concentration of laser induced defects in dense and porous films. The possible influence of optical active defects arising due to heating on the laser induced damage threshold is discussed.

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Ten-year summary of the Boulder Damage Symposium annual thin film laser damage competition

Cited by 26 publications

References 28 publications

Femtosecond Laser-Induced Damage Characterization of Multilayer Dielectric Coatings

Femtosecond Laser-Induced Damage Characterization of Multilayer Dielectric Coatings

Plasma-Enhanced Atomic Layer Deposition of HfO₂ with Substrate Biasing: Thin Films for High-Reflective Mirrors

Molecular Dynamics Simulation of Laser Induced Heating of Silicon Dioxide Thin Films

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Ten-year summary of the Boulder Damage Symposium annual thin film laser damage competition

Cited by 26 publications

References 28 publications

Femtosecond Laser-Induced Damage Characterization of Multilayer Dielectric Coatings

Femtosecond Laser-Induced Damage Characterization of Multilayer Dielectric Coatings

Plasma-Enhanced Atomic Layer Deposition of HfO2 with Substrate Biasing: Thin Films for High-Reflective Mirrors

Molecular Dynamics Simulation of Laser Induced Heating of Silicon Dioxide Thin Films

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Product

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Plasma-Enhanced Atomic Layer Deposition of HfO₂ with Substrate Biasing: Thin Films for High-Reflective Mirrors