SPIE Laser Damage最新文献_第6页

Selective cancellation of scattered light in optical substrates and coatings 光学基板和涂层中散射光的选择性消除

SPIE Laser Damage Pub Date : 2007-12-20 DOI: 10.1117/12.752717

C. Amra, C. Deumié, G. Georges, L. Arnaud, M. Zerrad, C. Grèzes-besset, F. Chazallet

引用次数: 1

Comparison of Gaussian and top-hat beam profiles in LIDT testing 高斯光束和顶帽光束在LIDT测试中的比较

SPIE Laser Damage Pub Date : 2007-12-20 DOI: 10.1117/12.752873

L. Jensen, M. Jupé, K. Starke, D. Ristau, W. Riede, P. Allenspacher

引用次数: 3

Operational experience of contamination and damage of the larger aperture optics in the HELEN laser facility vacuum system at 1053 and 527 nanometres 1053和527纳米HELEN激光设备真空系统中大孔径光学元件污染和损坏的操作经验

SPIE Laser Damage Pub Date : 2007-12-20 DOI: 10.1117/12.746743

J. Andrew, M. Girling, Nicholas Honiatt, D. Scott, P. Wallace

{"title":"Operational experience of contamination and damage of the larger aperture optics in the HELEN laser facility vacuum system at 1053 and 527 nanometres","authors":"J. Andrew, M. Girling, Nicholas Honiatt, D. Scott, P. Wallace","doi":"10.1117/12.746743","DOIUrl":"https://doi.org/10.1117/12.746743","url":null,"abstract":"In this paper we review contamination and damage that has occurred since the HELEN laser was converted for use as a chirped pulse amplification (CPA) system. We concentrate on the largest components in the facility that operated in a vacuum environment in the short pulse (500fs) parts of the system. This experience will be valuable for planning commissioning and operations on the successor facility, ORION that is currently being constructed. The optical components located in the vacuum sections will be described. We have an interest in laser-induced damage and contamination from the long pulse only (~1ns), short pulse only (500fs) and combined regimes. For most of the operations the CPA system has operated at a wavelength of 1053nm (1ω). Some experiments have also been conducted with 527nm (2ω) CPA light derived by the use of a KDP doubling crystal. Damage to the infra red pulse compression gratings has occurred infrequently with a minority of high-energy shots. Contamination of multilayer dielectric plane turning mirrors has arisen from target disassembly. Focussing systems using off axis parabolic mirrors have sustained contamination from debris and a dielectric protected silver reflector used for green light suffered laser induced damage. Debris shields placed between the target and the parabolas have been used on selected experiments. The shields were anti-reflection coated with single layer, sol gel silica. These shields became contaminated on the target facing sides and in the case of 2ω operation also from blow off of the damaged mirror coating that caused a two-pass transmission loss in the system. A number of characterisation methods were used to evaluate and quantify the damage and contamination. These include macroscopic photography, microscopy, reflectometry and transmission spectroscopy.","PeriodicalId":204978,"journal":{"name":"SPIE Laser Damage","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132171770","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Optimizing a cleaning process for multilayer-dielectric- (MLD) diffraction gratings 优化多层介质(MLD)衍射光栅的清洗工艺

SPIE Laser Damage Pub Date : 2007-12-20 DOI: 10.1117/12.751750

B. Ashe, C. Giacofei, G. Myhre, A. Schmid

{"title":"Optimizing a cleaning process for multilayer-dielectric- (MLD) diffraction gratings","authors":"B. Ashe, C. Giacofei, G. Myhre, A. Schmid","doi":"10.1117/12.751750","DOIUrl":"https://doi.org/10.1117/12.751750","url":null,"abstract":"A critical component for the OMEGA EP short-pulse petawatt laser system is the grating compressor chamber (GCC). This large (12,375 ft3) vacuum chamber contains critical optics where laser-pulse compression is performed at the output of the system on two 40-cm-sq-aperture, IR (1054-nm) laser beams. Critical to this compression, within the GCC, are four sets of tiled multilayer-dielectric- (MLD) diffraction gratings that provide the capability for producing 2.6-kJ output IR energy per beam at 10 ps. The primary requirements for these large-aperture (43-cm × 47-cm) gratings are diffraction efficiencies greater than 95%, peak-to-valley wavefront quality of less than λ/10 waves, and laser-induced-damage thresholds greater than 2.7 J/cm2 at 10-ps measured beam normal. Degradation of the grating laser-damage threshold due to adsorption of contaminants from the manufacturing process must be prevented to maintain system performance. In this paper we discuss an optimized cleaning process to achieve the OMEGA EP requirements. The fabrication of MLD gratings involves processes that utilize a wide variety of both organic materials (photoresist processes) and inorganic materials (metals and metal oxides) that can affect the final cleaning process. A number of these materials have significant optical absorbance; therefore, incomplete cleaning of these residues may result in the MLD gratings experiencing laser damage.","PeriodicalId":204978,"journal":{"name":"SPIE Laser Damage","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130022289","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 21

Laser damage of silica and hafnia thin films made with different deposition technologies 不同沉积工艺制备的二氧化硅和铪薄膜的激光损伤

SPIE Laser Damage Pub Date : 2007-12-20 DOI: 10.1117/12.752952

L. Gallais, J. Capoulade, J. Natoli, M. Commandré, M. Cathelinaud, Cian Koc, M. Lequime

引用次数: 3

Fluorescence monitoring of organic deposits 有机沉积物的荧光监测

SPIE Laser Damage Pub Date : 2007-12-20 DOI: 10.1117/12.752866

H. Schröder, S. Becker, Y. Lien, W. Riede, D. Wernham

引用次数: 9

Nanospallation induced by a femtosecond laser pulse 飞秒激光脉冲诱导的纳米散裂

SPIE Laser Damage Pub Date : 2007-12-18 DOI: 10.1117/12.738550

M. Agranat, S. Anisimov, S. Ashitkov, V. Zhakhovskiĭ, N. Inogamov, K. Nishihara, Y. Petrov

{"title":"Nanospallation induced by a femtosecond laser pulse","authors":"M. Agranat, S. Anisimov, S. Ashitkov, V. Zhakhovskiĭ, N. Inogamov, K. Nishihara, Y. Petrov","doi":"10.1117/12.738550","DOIUrl":"https://doi.org/10.1117/12.738550","url":null,"abstract":"In the present work phenomena are considered related to the interaction of ultra-short laser pulses, τL~0.1 ps, with metallic targets. The absorption of laser pulse results in formation of thin layer of hot electrons strongly superheated (Te>>Ti) relative to the ion temperature, Ti. Initial thickness of the layer dheat is small, dheat~δ, where δ~10 nm is the skin layer thickness. Subsequent developments include the following stages: (1) Propagation of electron thermal wave which expands the hot layer dheat; (2) Cooling of electrons due to energy transfer to cold ions; (3) Onset of hydrodynamic motion that constitutes the rarefaction wave with positive pressure; (4) Further expansion of target material leading to the appearance of negative pressure; and (5) Long separation process which begins with nucleation of voids and goes on to the total separation of spallation plate. The thickness of the plate is ~10 nm (we call it nanospallation). Theoretical model involves two-temperature hydrodynamic equations with semiempirical EOS for a metal, electron heat conduction and electron-ion energy exchange. The decay of metastable strongly stretched matter is described by molecular dynamics (MD) simulation with extremely large number of atoms. The experimental setup includes femtosecond chromium-forsterite laser operating in the pump-probe regime. The experiments are performed with gold target. Measured ablation threshold for gold is 1.35 J/cm2 of incident pump light at inclination 45°, p-polarization. Calorimeter measurements give for the absorbed fluence Fabs=0.3Finc, therefore the threshold value of Fabs is 0.4 J/cm2.","PeriodicalId":204978,"journal":{"name":"SPIE Laser Damage","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128289387","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Experimental and theoretical studies of subpicosecond laser damage in TixSi1-xO2 composite films 亚皮秒激光损伤TixSi1-xO2复合薄膜的实验与理论研究

SPIE Laser Damage Pub Date : 2007-12-18 DOI: 10.1117/12.753547

D. Nguyen, I. Cravetchi, L. Emmert, W. Rudolph, M. Jupé, M. Lappschies, K. Starke, D. Ristau

引用次数: 4

Effect of S and P polarization on single layer homogeneous model S和P极化对单层均匀模型的影响

SPIE Laser Damage Pub Date : 2007-12-18 DOI: 10.1117/12.752026

Udaibir Singh, A. Kapoor

引用次数: 0

The effect of lattice temperature on surface damage in fused silica optics 熔融石英光学中晶格温度对表面损伤的影响

SPIE Laser Damage Pub Date : 2007-12-18 DOI: 10.1117/12.752989

J. Bude, G. Guss, M. Matthews, M. Spaeth

引用次数: 35