&lt;title&gt;Laser-induced damage in optical materials under UV excimer laser radiation&lt;/title&gt;

Morozov, N. V.

doi:10.1117/12.213751

Cited by 4 publications

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“…This cleavage of functional groups and the breaking of bonds is the result of a process of nonlinear photon absorption, where two or more photons are absorbed into a chemical bond, which is subsequently disrupted. The consequence of this destruction of bonds can be an increase in porosity but also the destruction of optical instruments [23].…”

Section: Introductionmentioning

confidence: 99%

Carbon Transformation Induced by High Energy Excimer Treatment

et al. 2022

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The main aim of this study was to describe the treatment of carbon sheet with a high-energy excimer laser. The excimer modification changed the surface chemistry and morphology of carbon. The appearance of specific carbon forms and modifications have been detected due to exposure to laser beam fluencies up to 8 J.cm−2. High fluence optics was used for dramatic changes in the carbon layer with the possibility of Q-carbon formation; a specific amorphous carbon phase was detected with Raman spectroscopy. The changes in morphology were determined with atomic force microscopy and confirmed with scanning electron microscopy, where the partial formation of the Q-carbon phase was detected. Energy dispersive spectroscopy (EDS) was applied for a detailed study of surface chemistry. The particular shift of functional groups induced on laser-treated areas was determined by X-ray photoelectron spectroscopy. For the first time, high-dose laser exposure successfully induced a specific amorphous carbon phase.

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Section: Introductionmentioning

confidence: 99%

Carbon Transformation Induced by High Energy Excimer Treatment

et al. 2022

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Ultraviolet-induced densification in fused silica

Schenker

Oldham

1997

Journal of Applied Physics

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Ultraviolet-induced densification in fused silica is investigated using birefringence measurements to detect compaction-induced strain. This technique is capable of measuring compaction in the 10 parts per billion range in cm-sized specimens. A universal relation describing ultraviolet-induced compaction is discovered in which, using the total energy absorbed from two-photon absorption as the dose parameter, density changes equal a material dependent constant times the dose parameter to a power of about 0.65. This dose dependence is consistent with past compaction studies using electron beam and gamma radiation. Moreover, the density change per ionization “event” is found to be consistent for all radiation types. By comparing density measurements to refractive index change measurements found with interferometry, polarizability changes from ultraviolet-induced densification are extracted and compared with previous results using other radiation sources and inelastic densification methods.

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Ultraviolet-induced densification of fused silica

Piao

Oldham

Häller

2000

Journal of Applied Physics

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A number of fused silica samples were evaluated for their resistance to densification by deep UV radiation at 193 nm wavelength. Density changes for all the samples equal the product of a material dependent constant and the absorbed two-photon dose to a sublinear power of about 2/3. This dose dependence is consistent with earlier compaction studies using UV, electron, and gamma radiation. We also studied the isothermal-annealing behavior of UV-induced compaction in fused silica and found a correlation between thermal recovery of compaction and the compaction rates for different fused silica samples. Preheat-treatment at 950 °C for 1 h increased the UV-induced compaction rate of two types of fused silica samples, but did not affect that of the other two types of samples. Based on these experimental observations and the well-accepted network structure model of glasses, we propose a model to explain the sublinear power dependence on absorbed radiation dose for the ionization-induced compaction.

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<title>Laser-induced damage in optical materials under UV excimer laser radiation</title>

Cited by 4 publications

References 0 publications

Carbon Transformation Induced by High Energy Excimer Treatment

Carbon Transformation Induced by High Energy Excimer Treatment

Ultraviolet-induced densification in fused silica

Ultraviolet-induced densification of fused silica

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