Laser damage thresholds of optical coatings

Ristau, Detlev; Jupé, Marco; Starke, K.

doi:10.1016/j.tsf.2009.07.150

Cited by 69 publications

(23 citation statements)

References 5 publications

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“…Another crucial feature for the coatings applied in the high-power laser system is the laser damage resistance, which is normally evaluated by LIDT. Generally, this feature is acknowledged to be related with the structure of material, and a porous structure is considered helpful to increase the LIDT because extra space can contribute to buffer and relax the thermal effects produced by the high laser energy [35][36][37]. Therefore, the coating system designed in this study had an advantage since the dense structure of the polysiloxane coating was modified to be porous.…”

Section: Coating Applicationmentioning

confidence: 99%

Template-Free Fabrication of Refractive Index Tunable Polysiloxane Coating Using Homogeneous Embedding Strategy: Application in High-Power Laser System

et al. 2020

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A refractive index (RI) tunable polysiloxane coating was fabricated based on the cross-linked network structure embedded with mesoporous silica nanoparticles (MSNs), in which the MSNs were utilized to modulate the RI as well as to support the interior structure of the polysiloxane coating. The Si–O–Si inorganic backbone structure in combination with characteristics from the photopolymerization of active bonds produced the main cross-linked network structure, and controllable embedding of MSNs constructed the network-sphere structure. This approach eliminated the high-temperature post-treatment that was needed to remove the template, which ensures the safe application for temperature-sensitive laser crystal substrates and avoids coating structure collapse. In addition, degradation of the resulting coating can be minimized due to the similar chemical formation between MSN and polysiloxane coating. Hereby, a polysiloxane coating with expected spectral and laser damage-resistant properties can be obtained. This will facilitate the fabrication and application of a laser component with both high-transmission and high-flux capability for a high-power laser system.

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Section: Coating Applicationmentioning

confidence: 99%

Template-Free Fabrication of Refractive Index Tunable Polysiloxane Coating Using Homogeneous Embedding Strategy: Application in High-Power Laser System

et al. 2020

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“…For surfaces, the initiating defects are often linked to polishing residues [36], fractures [37,38], or contamination [39]. If the surface is coated, different additional limiting defects can be found in the multilayer system: Nodules [40], substrate contaminants [41], impurities coming from the coating chamber or from the source material [42,43], voids, grain boundaries. .…”

Section: Numerical Illustrationsmentioning

confidence: 99%

Tridimensional multiphysics model for the study of photo-induced thermal effects in arbitrary nano-structures

Demésy¹,

Gallais²,

Commandré³

2011

J. Eur. Opt. Soc.-Rapid Publ.

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In the present paper, we detail the implementation of a numerical scheme based on the Finite Element Method (FEM) dedicated to a tridimensional investigation of photo-induced thermal effects in arbitrary nano-structures. The distribution of Joule losses resulting from the scattering of an incident wave by an arbitrary object embedded in a multilayered media is used as source of a conductive thermal transient problem. It is shown that an appropriate and rigorous formulation of the FEM consists in reducing the electromagnetic scattering problem to a radiative one whose sources are localized inside the scatterer. This approach makes the calculation very tractable. Its advantage compared to other existing methods lies in its complete independence towards the geometric, optical and thermal properties of both the scatterer and the medium in which it lies. Among the wide range of domain of application of this numerical scheme, we illustrate its relevance when applied to two typical cases of laser damage of optical components in high power applications.

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“…Therefore, from the outset until nowadays, several activity fields -spatial [3][4][5], microelectronic [6][7][8][9], coating technologies [10], laser applications [11][12][13][14] -look for reducing contamination sources and study their impact on the surface properties. For example, for laser applications, contamination may impact the transmittance, the reflectance, or the laser-induced damage threshold (LIDT) of optics [15], limiting the development of high power lasers [16,17]. Therefore, several studies deal with intentional contamination of functional surfaces.…”

Section: Introductionmentioning

confidence: 99%

Study of organic contamination induced by outgassing materials. Application to the Laser MégaJoule optics

Favrat

Mangote

Tovena-Pecault

et al. 2014

Applied Surface Science

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International audienceOrganic contamination may decrease the targeted performances of coated surfaces. To study the contamination induced by surrounding materials, a method using a thermal extractor is presented in the first part of this work. Besides its normal operation (analyses of outgassing compounds from a material), this device is used in an original way to contaminate and decontaminate samples. Efficiency of contamination and decontamination protocols are assessed by automated thermal desorption and gas chromatography coupled with mass spectrometry and by secondary ion mass spectrometry coupled with a time of flight mass analyzer. This enables to study the contamination induced by a bulk material outgassing and to take in consideration the possible competition between outgassed species. This method is then applied to investigate contamination of Laser MégaJoule sol–gel coated optics by a retractable sheath. The impact of the temperature on the outgassing of the sheath has been highlighted. Increasing temperature from 30 to 50 • C enables the outgassing of organophosphorous compounds and increases the outgassing of oxy-genated compounds and phthalates. Chemical analyses of contaminated optics have highlighted affinities between the sol–gel coating and phthalates and organophosphorous, and low affinities with aromatics and terpens. Finally, samples with increasing levels of contamination have been realized. However a saturation phenomenon is observed at 90 ng cm–2

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Laser damage thresholds of optical coatings

Cited by 69 publications

References 5 publications

Template-Free Fabrication of Refractive Index Tunable Polysiloxane Coating Using Homogeneous Embedding Strategy: Application in High-Power Laser System

Template-Free Fabrication of Refractive Index Tunable Polysiloxane Coating Using Homogeneous Embedding Strategy: Application in High-Power Laser System

Tridimensional multiphysics model for the study of photo-induced thermal effects in arbitrary nano-structures

Study of organic contamination induced by outgassing materials. Application to the Laser MégaJoule optics

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