SPIE Laser Damage最新文献_第10页

A laser preconditioning process for improving the laser damage threshold, and the search for subtle laser damage from long-duration laser exposure for IBS thin films 一种提高激光损伤阈值的激光预处理工艺，以及对IBS薄膜长时间激光暴露的细微激光损伤的研究

SPIE Laser Damage Pub Date : 2007-10-10 DOI: 10.1117/12.753747

Dale C. Ness, A. Streater

引用次数: 2

Photo-ionization of superlattices on dielectric surface by IR radiation 红外辐射下介电表面超晶格的光电离

SPIE Laser Damage Pub Date : 2007-10-10 DOI: 10.1117/12.754056

V. Gruzdev

{"title":"Photo-ionization of superlattices on dielectric surface by IR radiation","authors":"V. Gruzdev","doi":"10.1117/12.754056","DOIUrl":"https://doi.org/10.1117/12.754056","url":null,"abstract":"In this paper we analyze the photo-excitation of electron sub-system of a periodic nano-structure by IR laser radiation. The nano-structure is a 1D super-lattice on surface of dielectric or semiconductor material transparent for the incident radiation. Theoretical description of the photo-excitation is based on the recent modification of the Keldysh theory adapted to the 1D case. We show that two specific regimes of the photo-excitation are possible in the super-lattices: photo-excitation suppression corresponding to decrease of the photo-excitation rate with increasing of laser intensity, and singularity regime corresponding to abrupt increase of the photo-ionization rate. Threshold of the singularity regime is calculated as function of laser wavelength and super-lattice period. The obtained results allow to propose a promising application of the super-lattices as intensity limiters for IR optical systems. In particular, we can calculate the period of the super-lattice to provide limiting of input laser intensity at required level due to multi-photon absorption by electrons of the lattice. Temperature of laser-induced heating resulted from total absorption of an incident laser pulse and diffraction distortions induced by the super-lattice are estimated to confirm possibility of utilizing the super-lattices as the intensity limiters.","PeriodicalId":204978,"journal":{"name":"SPIE Laser Damage","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116101573","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: 0

Comparison between S/1 and R/1 tests and damage density vs. fluence (ρ(Φ)) results for unconditioned and sub-nanosecond laser-conditioned KD2PO4 crystals 非条件和亚纳秒激光条件下KD2PO4晶体S/1和R/1测试及损伤密度与通量(ρ(Φ))结果的比较

SPIE Laser Damage Pub Date : 2007-10-10 DOI: 10.1117/12.752961

J. Adams, J. Jarboe, M. Feit, R. Hackel

{"title":"Comparison between S/1 and R/1 tests and damage density vs. fluence (ρ(Φ)) results for unconditioned and sub-nanosecond laser-conditioned KD2PO4 crystals","authors":"J. Adams, J. Jarboe, M. Feit, R. Hackel","doi":"10.1117/12.752961","DOIUrl":"https://doi.org/10.1117/12.752961","url":null,"abstract":"We present S/1 and R/1 test results on unconditioned and 355 nm (3ω), 500 ps laser conditioned DKDP. We find up to ~2.5X improvement in fluence in the S/1 performance after 3ω, 500 ps conditioning to 5 J/cm2. For the first time, we observe a shift to higher fluences in the R/1 results for DKDP at 3ω, 7 ns due to 500 ps laser conditioning. The S/1 results are compared to ρ(Φ) results previously measured on the same DKDP crystal [1]. A consistent behavior in fluence was found between the S/1 and ρ(Φ) results for unconditioned and 500 ps conditioned DKDP. We were successful at using Poisson statistics to derive a connection between the S/1 and ρ(Φ) results that could be tested with our data sets by trying to predict the shape of the ρ(Φ) curve. The value for the power dependence on fluence of ρ(Φ) derived from the S/1 data was ~11 ± 50%. The results presented and discussed here imply a strong correlation between the damage probability (S/1) test and ρ(Φ). We find a consistent description of the two test types in terms of a power law ρ(Φ) and that this basic shape held for all cases, i.e. the shape was invariant between unconditioned and conditioned results.","PeriodicalId":204978,"journal":{"name":"SPIE Laser Damage","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116291707","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: 11

Optical damage observed in the LHMEL II output coupler 在LHMEL II输出耦合器中观察到光学损伤

SPIE Laser Damage Pub Date : 2007-10-10 DOI: 10.1117/12.758950

John J. Eric, John O. Bagford, C. Devlin, R. Hull, Daniel B. Seibert

{"title":"Optical damage observed in the LHMEL II output coupler","authors":"John J. Eric, John O. Bagford, C. Devlin, R. Hull, Daniel B. Seibert","doi":"10.1117/12.758950","DOIUrl":"https://doi.org/10.1117/12.758950","url":null,"abstract":"During the annual NIST calibration testing done at the LHMEL facility in FY06 on its high energy Carbon-Dioxide lasers, the LHMEL II device suffered severe damage to the internal surface of its ZnSe output coupler optics. The damage occurred during a high power, short duration run and it was believed to have been the result of a significant amount of surface contaminants interacting with the LHMEL cavity beam. Initial theories as to the source of the contamination led to the inspection of the vacuum grease that seals the piping that supplies the source gases to the laser cavity. Other contamination sources were considered, and analysis was conducted in an effort to identify the material found at the damage sites on the optic, but the tests were mainly inconclusive. Some procedure changes were initiated to identify possible contamination before high energy laser operation in an attempt to mitigate and possibly prevent the continued occurrence of damage to the output coupler window. This paper is to illustrate the type and extent of the damage encountered, highlight some of the theories as to the contamination source, and serve as a notice as to the severity and consequences of damage that is possible even due to small amounts of foreign material in a high energy laser environment.","PeriodicalId":204978,"journal":{"name":"SPIE Laser Damage","volume":"100 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114515809","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: 0

A model of laser-induced damage of KDP based on the coupling of statistics and heat transfer 基于统计与传热耦合的激光损伤模型

SPIE Laser Damage Pub Date : 2007-10-10 DOI: 10.1117/12.752614

G. Duchateau, A. Dyan

引用次数: 1

Influence of process conditions on the optical properties HfO2/SiO2 thin films for high power laser coatings 工艺条件对高功率激光涂层HfO2/SiO2薄膜光学性能的影响

SPIE Laser Damage Pub Date : 2007-10-10 DOI: 10.1117/12.753027

B. Langdon, D. Patel, E. Krous, J. Rocca, C. Menoni, F. Tomasel, S. Kholi, P. Mccurdy, P. Langston, A. Ogloza

引用次数: 16

Measurement of initial absorption of fused silica at 193nm using laser induced deflection technique (LID) 激光诱导偏转技术测量熔融二氧化硅在193nm处的初始吸收

SPIE Laser Damage Pub Date : 2007-10-10 DOI: 10.1117/12.753081

D. Schönfeld, U. Klett, C. Mühlig, S. Thomas

{"title":"Measurement of initial absorption of fused silica at 193nm using laser induced deflection technique (LID)","authors":"D. Schönfeld, U. Klett, C. Mühlig, S. Thomas","doi":"10.1117/12.753081","DOIUrl":"https://doi.org/10.1117/12.753081","url":null,"abstract":"The ongoing development in microlithography towards further miniaturization of structures creates a strong demand for lens material with nearly ideal optical properties. Beside the highly demanding requirements on homogeneity and stress induced birefringence (SIB), low absorption is a key factor. Even a small absorption is associated with a temperature increase and results in thermally induced local variations of refractive index and SIB. This could affect the achievable resolution of the lithographic process. The total absorption of the material is composed of initial absorption and of absorption induced during irradiation. Thus, the optimization of both improves the lifetime of the material. In principal, it is possible to measure transmission and scattering with a suitable spectrometer assembly and calculate absorption from them. However, owing to the influence of sample surfaces and errors of measurement, these methods usually do not provide satisfactory results for highly light-transmissive fused silica. Therefore, it is most desirable to find a technique that is capable of directly measuring absorption coefficients in the range of (1...10)•10-4 cm-1 (base 10) directly. We report our first results for fused silica achieved with the LID technique. Besides a fused silica grade designed for 193 nm applications, grades with higher absorption at 193 nm were measured to test the LID technique. A special focus was set on the possibility of measuring initial absorption without the influence of degradation effects.","PeriodicalId":204978,"journal":{"name":"SPIE Laser Damage","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130946788","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: 7

Scaling in damage of optical materials by intensive laser radiation 强激光对光学材料损伤的标度研究

SPIE Laser Damage Pub Date : 2007-10-10 DOI: 10.1117/12.753827

E. Maldutis

引用次数: 2

Effect of laser pulse duration on damage to metal mirrors for laser IFE 激光脉冲时间对激光IFE金属镜损伤的影响

SPIE Laser Damage Pub Date : 2007-10-10 DOI: 10.1117/12.752940

J. Pulsifer, M. Tillack, S. S. Harilal

引用次数: 1

Effect of electric field distribution on the laser damage probability curves of multilayer coatings 电场分布对多层涂层激光损伤概率曲线的影响

SPIE Laser Damage Pub Date : 2007-10-10 DOI: 10.1117/12.752820

H. Krol, C. Amra, C. Grèzes-besset, M. Commandré

引用次数: 2