Thin films characterizations to design high-reflective coatings for ultrafast high power laser systems

Hervy, Adrien; Gallais, Laurent; Mouricaud, Daniel; Chériaux, G.; Utéza, O.; Clady, R.; Sentís, M.; Fréneaux, Antoine

doi:10.1117/12.2068047

Cited by 4 publications

(2 citation statements)

References 13 publications

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“…Therefore, if the initial damage layer for different coatings is made of the same material, we can calculate the relations among damage thresholds of different designs from the electric field distribution. Thus, the theoretical damage threshold can be calculated according to Equation (1) [16,23].…”

Section: Discussionmentioning

confidence: 99%

Effect of Electric Field Regulation on Laser Damage of Composite Low-Dispersion Mirrors

Zhang

Wang

et al. 2021

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Low dispersion mirrors are important because of their potential use in petawatt (PW) laser systems. The following two methods are known to increase the laser-induced damage threshold of low dispersion optical components: use of a wide-bandgap-material protective layer and control of electric field distribution. By controlling the electric field distribution of composite low-dispersion mirrors (CLDM), we shift the electric field peaks from the material interface into the wide-bandgap material. However, the damage threshold of modified-electric-field composite low dispersion mirror (E-CLDM) does not increase. Damage morphology shows that the initial damaged layer is Ta2O5. An immediate cause is the enhancement of the electric field in internal layers caused by surface electric field regulation. Theoretical calculations show that the damage threshold of CLDM or E-CLDM is determined by the competition results of bandgap and the electric field of layer materials. The CLDM with different materials or different protective layer periods can be optimally designed according to the electric field competition effect in the future.

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Section: Discussionmentioning

confidence: 99%

Effect of Electric Field Regulation on Laser Damage of Composite Low-Dispersion Mirrors

Zhang

Wang

et al. 2021

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“…15 The beam of the PETAL (PETawatt Aquitaine Laser) facility 16 [6], is linearly polarized after the compression stage. Depending Damage Threshold (LIDT) are both dependent on polarization 20 [7]. The electric field enhancement is lower in s-polarization 21 which leads to a higher LIDT in the sub-picosecond and picosec-22 ond regimes [8].…”

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Polarization dependence of laser damage growth features on multilayer dielectric mirrors for petawatt-class lasers

et al. 2022

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PETAL (Petawatt Aquitaine Laser) is an ultrahigh-power laser dedicated to academic research that delivers sub-picosecond pulses. One of the major issues of these facilities is the laser damage on optical components located at the final stage. Transport mirrors of the PETAL facility are illuminated under different polarization directions. This configuration motivates a thorough investigation of the dependency of the laser damage growth features (thresholds, dynamics, and damage site morphologies) on the incident polarization. Damage growth experiments were carried out in s- and p-polarization at 0.8 ps and 1053 nm on multilayer dielectric mirrors with a squared top-hat beam. Damage growth coefficients are determined by measuring the evolution of the damaged area for both polarizations. In this Letter, we report higher damage growth threshold in p-polarization together with higher damage initiation threshold in s-polarization. We also report faster damage growth dynamics in p-polarization. The damage site morphologies and their evolution under successive pulses are found to strongly depend on polarization. A numerical model in 3D was developed to assess experimental observations. This model shows the relative differences in damage growth threshold even if it is not able to reproduce the damage growth rate. Numerical results demonstrate that damage growth is mainly driven by the electric field distribution which depends on the polarization.

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Role of HfO₂/SiO₂thin-film interfaces in near-ultraviolet absorption and pulsed laser damage

et al. 2016

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Thin films characterizations to design high-reflective coatings for ultrafast high power laser systems

Cited by 4 publications

References 13 publications

Effect of Electric Field Regulation on Laser Damage of Composite Low-Dispersion Mirrors

Effect of Electric Field Regulation on Laser Damage of Composite Low-Dispersion Mirrors

Polarization dependence of laser damage growth features on multilayer dielectric mirrors for petawatt-class lasers

Role of HfO₂/SiO₂thin-film interfaces in near-ultraviolet absorption and pulsed laser damage

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Thin films characterizations to design high-reflective coatings for ultrafast high power laser systems

Cited by 4 publications

References 13 publications

Effect of Electric Field Regulation on Laser Damage of Composite Low-Dispersion Mirrors

Effect of Electric Field Regulation on Laser Damage of Composite Low-Dispersion Mirrors

Polarization dependence of laser damage growth features on multilayer dielectric mirrors for petawatt-class lasers

Role of HfO2/SiO2thin-film interfaces in near-ultraviolet absorption and pulsed laser damage

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Role of HfO₂/SiO₂thin-film interfaces in near-ultraviolet absorption and pulsed laser damage