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Short Wavelength Coherent Radiation: Generation and Applications最新文献

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Studies of Hot, Solid Materials Produced by an Ultrashort Pulse Laser 超短脉冲激光产生热固体材料的研究
Short Wavelength Coherent Radiation: Generation and Applications Pub Date : 1900-01-01 DOI: 10.1364/swcr.1988.soa418
H. Milchberg, R. Freeman
{"title":"Studies of Hot, Solid Materials Produced by an Ultrashort Pulse Laser","authors":"H. Milchberg, R. Freeman","doi":"10.1364/swcr.1988.soa418","DOIUrl":"https://doi.org/10.1364/swcr.1988.soa418","url":null,"abstract":"A series of ultrashort pulse laser-solid interaction experiments have been performed using copper and aluminum which illustrate charge transport properties of these strongly heated materials at near-solid density. In aluminum, as a Drude metal at the laser wavelength, the transport is seen to be strongly dominated by collisions with the appearance of a minimum mean free path. In copper, band absorption of the laser light is seen to be a strong process even at ~ 50 eV temperatures.\u0000 In the context of using ultra-short pulse laser-produced plasmas as a source of ultrashort pulse soft X-rays, evidence is presented that heat loss mechanisms in these hot solids may not be sufficiently rapid to result in subpicosecond soft X-ray bursts.","PeriodicalId":190758,"journal":{"name":"Short Wavelength Coherent Radiation: Generation and Applications","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115497644","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
Capillary Discharge Plasmas as Extreme Ultraviolet Laser Sources 毛细管放电等离子体作为极紫外激光源
Short Wavelength Coherent Radiation: Generation and Applications Pub Date : 1900-01-01 DOI: 10.1364/swcr.1988.swlos99
J. Rocca, M. Marconi, M. Muñiz, D. Beethe
{"title":"Capillary Discharge Plasmas as Extreme Ultraviolet Laser Sources","authors":"J. Rocca, M. Marconi, M. Muñiz, D. Beethe","doi":"10.1364/swcr.1988.swlos99","DOIUrl":"https://doi.org/10.1364/swcr.1988.swlos99","url":null,"abstract":"We propose the generation of XUV and soft X-ray laser radiation by electronion recombination in capillary plasmas excited by fast discharges. Highly ionized plasmas are created in a capillary geometry by a high current pulse; subsequently rapid cooling of the plasma occurs by electron heat conduction and radiation. Electron-ion recombination is expected to result in population inversion and gain in 3-2 transitions of hydrogenic ions with wavelengths ranging from the VUV to soft X-rays. We have generated nearly completely ionized helium and lithium capillary plasmas to study the possibility of amplification in the 3-2 hydrogenic lines during plasma recombination. Time resolved XUV spectra of a 500 μm diameter lithium capillary discharge were obtained. The intensity of the LiIII 72.9 nm 3-2 line is observed to increase during the decay of the current pulse. The capillary discharge recombination scheme is expected to advantageously scale to soft X-rays wavelengths. A time dependent collisional-radiative model of the capillary plasmas predicts a gain of 5 cm−1 in the 18.2 nm CVI transition.","PeriodicalId":190758,"journal":{"name":"Short Wavelength Coherent Radiation: Generation and Applications","volume":"107 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125126218","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
Soft X-Ray Amplification in a Magnetically Confined Recombining H-like and Li-like Plasma 磁约束重组类h和类li等离子体中的软x射线放大
Short Wavelength Coherent Radiation: Generation and Applications Pub Date : 1900-01-01 DOI: 10.1364/swcr.1988.swlos116
D. Kim, C. Skinner, A. Wouters, E. Valeo, D. Voorhees, S. Suckewer
{"title":"Soft X-Ray Amplification in a Magnetically Confined Recombining H-like and Li-like Plasma","authors":"D. Kim, C. Skinner, A. Wouters, E. Valeo, D. Voorhees, S. Suckewer","doi":"10.1364/swcr.1988.swlos116","DOIUrl":"https://doi.org/10.1364/swcr.1988.swlos116","url":null,"abstract":"A series of experiments with H-like carbon has been performed using a Nd/Glass laser ( maximum output energy is 100 J in 3 nsecs ) in a line focus configuration. The maximum gain observed was 8.1 cm−1 using 25 J laser energy. This work is an initial step toward the development of a soft x-ray amplifier for the presently operating C VI 182 Å soft x-ray laser in a CO2 laser produced plasma confined in a magnetic field.\u0000 The possibility of lasing action at 187.2 Å in Li-like Mg X, 154.7 Å in Li-like Al XI, and 129 Å in Li-like Si XII in a magnetically confined recombing plasma has been also investigated. A CO2 laser was focused onto a target assembly and the resulting plasma confined in a solenoidal magnet field up to 9 Tesla. Impurities such as iron or titanium were introduced to increase the cooling in the recombination phase to produce more favorable conditions for high gain. Gain-length products of 1 ~ 2 at 187.2 Å in Mg X, 3 ~ 4 at 154.7 Å in Al XI, and 1 ~ 2 at 129 Å in Si XII were observed. To better understand plasma dynamics, a one-dimensional hydro-atomic code has been developed to simulate the experiment. The comparison between experiments and computer simulation will be discussed.","PeriodicalId":190758,"journal":{"name":"Short Wavelength Coherent Radiation: Generation and Applications","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121674772","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
Non-Reciprocity of Autoionizing Interferences: Lasers Without Inversion 自电离干涉的非互易性:无反转的激光器
Short Wavelength Coherent Radiation: Generation and Applications Pub Date : 1900-01-01 DOI: 10.1364/swcr.1988.soa414
S. Harris
{"title":"Non-Reciprocity of Autoionizing Interferences: Lasers Without Inversion","authors":"S. Harris","doi":"10.1364/swcr.1988.soa414","DOIUrl":"https://doi.org/10.1364/swcr.1988.soa414","url":null,"abstract":"Interferences of autoionizing lines may reduce or eliminate absorption of lower level atoms. Stimulated emission shows no such interferences, thereby allowing laser gain without population inversion.","PeriodicalId":190758,"journal":{"name":"Short Wavelength Coherent Radiation: Generation and Applications","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121995887","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
Search for X-Rays Generated by Collisionless Multiphoton Processes 寻找由无碰撞多光子过程产生的x射线
Short Wavelength Coherent Radiation: Generation and Applications Pub Date : 1900-01-01 DOI: 10.1364/swcr.1988.hilim242
P. Lee, D. Casperson, G. Schappert
{"title":"Search for X-Rays Generated by Collisionless Multiphoton Processes","authors":"P. Lee, D. Casperson, G. Schappert","doi":"10.1364/swcr.1988.hilim242","DOIUrl":"https://doi.org/10.1364/swcr.1988.hilim242","url":null,"abstract":"We have conducted photon counting experiments to search for x rays which may be generated by either collisionless multiphoton induced inner-shell processes or bremsstrahlung at high laser irradiance. Using KrF light at an irradiance ~ 3 x 1017 W/cm2 on low density Xe gas targets, we detect no prompt photons which are characteristic of these processes.","PeriodicalId":190758,"journal":{"name":"Short Wavelength Coherent Radiation: Generation and Applications","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121681408","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
Saddle Toroid Arrays: Novel Grazing Incidence Optics for Synchrotron X-Ray Lithography 鞍形环面阵列:同步加速器x射线光刻的新型掠入射光学
Short Wavelength Coherent Radiation: Generation and Applications Pub Date : 1900-01-01 DOI: 10.1364/swcr.1988.od339
R. Rosser, P. Wormell
{"title":"Saddle Toroid Arrays: Novel Grazing Incidence Optics for Synchrotron X-Ray Lithography","authors":"R. Rosser, P. Wormell","doi":"10.1364/swcr.1988.od339","DOIUrl":"https://doi.org/10.1364/swcr.1988.od339","url":null,"abstract":"Replacing the scanning mirror in a synchrotron lithography beamline with a fixed saddle-toroid array mirror will give uniform illumination over wafer-size fields, without the problem of moving parts in the high vacuum section of the beamline, the constraints of oscillating the electron beam in the storage ring or the engineering difficulties of moving the entire wafer alignment system.\u0000 Ray tracing results for one and two saddle-toroid systems are presented, showing that a single saddle-toroid mirror provides a satisfactory alternative to the scanning cylindrical mirrors used in existing lithography beamlines, if the input beam is uniform. A two element system, comprising a saddle-toroid and a cylindrical mirror, can be used to give a nearly rectangular patch of illumination, closely matched to the needs of lithography. However the total usable flux through the such a device is lower, because of the extra reflection.\u0000 Both designs require a uniform input beam and are not suitable for the gaussian profiled synchrotron beam. By using the techniques developed to produce micro-lens arrays, saddle-toroid arrays can be made which spatially average the beam. These provide outputs that are uniform, even from a synchrotron beam.\u0000 Though designed with storage ring x-ray lithography in mind, saddle-toroid arrays may have applications in expanding undulator and free-electron laser output.\u0000 Patents are pending.","PeriodicalId":190758,"journal":{"name":"Short Wavelength Coherent Radiation: Generation and Applications","volume":"200 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131811548","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
Population Inversion through Charge Exchange Process in Plasmas 等离子体电荷交换过程中的居群反转
Short Wavelength Coherent Radiation: Generation and Applications Pub Date : 1900-01-01 DOI: 10.1364/swcr.1988.swlos52
T. Kato, K. Masai, T. Fujimoto
{"title":"Population Inversion through Charge Exchange Process in Plasmas","authors":"T. Kato, K. Masai, T. Fujimoto","doi":"10.1364/swcr.1988.swlos52","DOIUrl":"https://doi.org/10.1364/swcr.1988.swlos52","url":null,"abstract":"Population inversion due to charge exchange processes is investigated for helium-like ions in tokamaks by using a collisional radiative model. Dependence of charge exchange cross secions on the quantum numbers n, Z is estimated from the observed spectra.","PeriodicalId":190758,"journal":{"name":"Short Wavelength Coherent Radiation: Generation and Applications","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130427647","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
Spectra of Lead, Bismuth, Thorium and Uranium Relevent To A Neodymium-Like Soft X-ray Lasing Scheme 与类钕软x射线激光方案相关的铅、铋、钍和铀的光谱
Short Wavelength Coherent Radiation: Generation and Applications Pub Date : 1900-01-01 DOI: 10.1364/swcr.1988.swlos133
W. Hodge, P. Filbert, D. A. Kohler, C. Navoda, J.D. Perez, P. Hagelstein, S. Maxon, J. Scofield, J. Peek
{"title":"Spectra of Lead, Bismuth, Thorium and Uranium Relevent To A Neodymium-Like Soft X-ray Lasing Scheme","authors":"W. Hodge, P. Filbert, D. A. Kohler, C. Navoda, J.D. Perez, P. Hagelstein, S. Maxon, J. Scofield, J. Peek","doi":"10.1364/swcr.1988.swlos133","DOIUrl":"https://doi.org/10.1364/swcr.1988.swlos133","url":null,"abstract":"The Nd-like isoelectronic sequence (60 electrons) of high Z elements could provide the basis for a soft x-ray laser (1). Gain may be possible at approximately 70 A for the 5f-5d transition in Nd-like Uranium. The potential advantage is that a medium power Nd:glass laser (10E12 to 10E13 watts/cm2) is sufficient to create a soft x-ray laser. As a first step in this development, soft x-ray spectra from Pb, Bi, Th and U were taken. These results will be presented along with three different atomic structure computer calculations of transition energies.","PeriodicalId":190758,"journal":{"name":"Short Wavelength Coherent Radiation: Generation and Applications","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129699528","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
X-Ray Emission Studies of Sub-Picosecond Laser Produced Plasmas 亚皮秒激光等离子体的x射线发射研究
Short Wavelength Coherent Radiation: Generation and Applications Pub Date : 1900-01-01 DOI: 10.1364/swcr.1988.swlos189
M. Murnane, H. Kapteyn, R. Falcone
{"title":"X-Ray Emission Studies of Sub-Picosecond Laser Produced Plasmas","authors":"M. Murnane, H. Kapteyn, R. Falcone","doi":"10.1364/swcr.1988.swlos189","DOIUrl":"https://doi.org/10.1364/swcr.1988.swlos189","url":null,"abstract":"We report on both experimental and theoretical studies of high-temperature, high-density plasmas produced when a solid is illuminated with intense, 160 femtosecond laser pulses. Time resolved measurements have determined the x-ray pulsewidth from the plasma to be 2 ± 2 psec in all spectral regions up to a kilovolt. Spectroscopic observations demonstrate that the x-ray emission comes from regions of density higher than those found in a conventional laser produced plasma. Finally reflectivity measurements indicate that the laser is absorbed at the surface of the solid before it expands.","PeriodicalId":190758,"journal":{"name":"Short Wavelength Coherent Radiation: Generation and Applications","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129841367","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
High Efficiency, Scalable, 130 nm Coherent Source by Four-Wave Mixing in Hg Vapor 高效，可扩展，130纳米相干源的四波混频汞蒸气
Short Wavelength Coherent Radiation: Generation and Applications Pub Date : 1900-01-01 DOI: 10.1364/swcr.1988.swlos177
C. Muller, C. Hamilton, D. Lowenthal, A. Smith
{"title":"High Efficiency, Scalable, 130 nm Coherent Source by Four-Wave Mixing in Hg Vapor","authors":"C. Muller, C. Hamilton, D. Lowenthal, A. Smith","doi":"10.1364/swcr.1988.swlos177","DOIUrl":"https://doi.org/10.1364/swcr.1988.swlos177","url":null,"abstract":"Coherent vacuum ultraviolet (VUV) pulses with energy 1.1 mJ, 3 ns pulse length (1.3 MW cm-2 unfocused), and measured bandwidth <0.1 cm-1 have been achieved using four-wave sum-frequency mixing in mercury vapor. High energy conversion efficiencies of 5 percent have been demonstrated in a collimated beam geometry over 1 meter interaction lengths. The 130 nm radiation is tunable over 2.5 cm-1. The experimental facility assembled to produce this efficient VUV laser source will be described, and comparison between experimental measurements and theory are provided.","PeriodicalId":190758,"journal":{"name":"Short Wavelength Coherent Radiation: Generation and Applications","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132632912","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
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