Laser damage threshold for dielectric coatings as determined by inclusions

Milam, D.; Bradbury, R. A.; Bass, Michael

doi:10.1063/1.1654780

Cited by 30 publications

(9 citation statements)

References 7 publications

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“…Laser damage of dielectric thin films in the nano-second regime is mainly initiated by nanometric absorbing defects [8][9][10] inherent to the manufacturing process. A useful method to obtain information on the damaging defects is to study the laser damage statistics: defect statistical model.…”

Section: Discussionmentioning

confidence: 99%

Laser conditioning of high-reflective and anti-reflective coatings in vacuum environments

Ling

Zhao

et al. 2010

Optics Communications

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Section: Discussionmentioning

confidence: 99%

Laser conditioning of high-reflective and anti-reflective coatings in vacuum environments

Ling

Zhao

et al. 2010

Optics Communications

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“…. On the other hand, this very same effect has proven to be harmful and costly in high-power applications where local scatterers and absorbers can enhance the local electric field and induce strong local temperature rise leading [9,10] to the damage of expensive large optical components. But in any case, there has recently been a growing interest in photo-induced thermal effects in various domains where metallic nano-structures are at stake.…”

Section: Introductionmentioning

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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“…Pit formation as a result of inclusions has also been extensively studied both experimentally 11,[37][38][39] and theoretically. 40,41 These studies have shown that nodular defect ejection depends on seed diameter and on incident laser fluence.…”

Section: Introductionmentioning

confidence: 99%

“…The importance of damage morphology studies has been widely recognized and many researchers have attempted to understand the relationship between damage morphology, damage threshold, and a variety of parameters such as wavelength, [4][5][6] fluence, 7 film material (composition and properties), 4,[8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26] optical design 9,27 and film thickness, 28 pulse length, 4,5,7,[29][30][31] and laser pulse repetition rate. 29,32 Understanding these relationships may allow process optimization so as to let the coating evolve (e.g.…”

Section: Introductionmentioning

confidence: 99%

<title>Morphologies of laser-induced damage in hafnia-silica multilayer mirror and polarizer coatings</title>

Génin

Stolz

1996

SPIE Proceedings

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August 22, 1996This is a preprint of a paper intended for publication in a journal or proceedings. Since changes may be made before publication, this preprint is made available with the understanding that it will not be cited or reproduced without the permission of the author. PREPRINTThis paper was prepared for submittal to the DISCLAIMER This document was prepared as an account of work sponsored by an agency of the United States Government. Neither the United States Government nor the University of California nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise, does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or the University of California. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or the University of California, and shall not be used for advertising or product endorsement purposes. ABSTRACTHafnia-silica multilayer mirrors and polarizers were deposited by e-beam evaporation onto BK7 glass substrates. The mirrors and polarizers were coated for operation at a wavelength of 1053 nm at 45° and at Brewster's angle (56°), respectively. They were tested with a single 3-ns laser pulse. The morphology of the laser-induced damage was characterized by optical and scanning electron microscopy. Four distinct damage morphologies were found: pits, flat bottom pits, scalds, and delaminates. The pits and flat bottom pits (< 30 µm in diameter) were detected at lower fluences (as low as 5 J/cm 2 ). The pits seemed to result from ejection of nodular defects by causing local enhancement of the electric field. Scalds and delaminates could be observed at higher fluences (above 13 J/cm 2 ) and seemed to result from the formation of plasmas on the surface. These damage types often originated at pits and were typically less than 300 µm in diameter; their size increased almost linearly with fluence. Finally, the effects of the damage on the characteristics of the beam (reflectivity degradation and phase modulations) were measured.

show abstract

Laser damage threshold for dielectric coatings as determined by inclusions

Cited by 30 publications

References 7 publications

Laser conditioning of high-reflective and anti-reflective coatings in vacuum environments

Laser conditioning of high-reflective and anti-reflective coatings in vacuum environments

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

<title>Morphologies of laser-induced damage in hafnia-silica multilayer mirror and polarizer coatings</title>

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