International Laser Science Conference最新文献_第8页

Single atomic particle at rest in free space 在自由空间中静止的单个原子粒子

International Laser Science Conference Pub Date : 1987-09-25 DOI: 10.1007/978-3-540-47973-4_10

H. Dehmelt

引用次数: 5

Interactions of excimer lasers with polymers 准分子激光与聚合物的相互作用

International Laser Science Conference Pub Date : 1987-09-25 DOI: 10.1063/1.36803

Y. Liu, H. Cole, H. Philipp

{"title":"Interactions of excimer lasers with polymers","authors":"Y. Liu, H. Cole, H. Philipp","doi":"10.1063/1.36803","DOIUrl":"https://doi.org/10.1063/1.36803","url":null,"abstract":"Interaction of high photon energy (> 5-eV) radiation from excimer lasers with polymeric materials has drawn much interest because of its potential importance in material processing such as etching and patterning which have found use over a number of diversified fields such as medicine, polymer science, and microelectronics. The laser etching process is noncontact, maskless, selective, and offers a high spatial resolution. Although the topic has been the subject of numerous recent studies, basic parameters for understanding interactions between polymers and high energy photons are not well understood. In this paper we present the results of a recent study on VUV optical properties of several polymeric materials including polymethyl methacrylate (PMMA), polystyrene (PS), polyvinylacetate (PVA), polyimide (PI), and polycarbonate (PC) and review parameters that are critical for understanding the interaction of polymers with excimer laser radiation. Results of a study of the surface compostions using small area x-ray photoelectron spectroscopy of two kinds of polymer, PMMA and PS, irradiated with an ArF laser at a photon energy of 6.4 eV are discussed. A simple model is then presented to show how various parameters including optical constants, photon energy, laser fluence, and polymer structures affect characteristics of photon etching observed in these polymers.","PeriodicalId":422579,"journal":{"name":"International Laser Science Conference","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1987-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128730881","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: 3

Classical and holographic interferometry systems combined to document inertial fusion experiments 经典和全息干涉测量系统相结合，以记录惯性聚变实验

International Laser Science Conference Pub Date : 1987-09-25 DOI: 10.1063/1.36791

J. Ankney, G. Busch

{"title":"Classical and holographic interferometry systems combined to document inertial fusion experiments","authors":"J. Ankney, G. Busch","doi":"10.1063/1.36791","DOIUrl":"https://doi.org/10.1063/1.36791","url":null,"abstract":"Inertial fusion (IF) employs laser beams to implode spherical shells containing deuterium and tritium. Freezing the DTfuel in a uniform layer within the container aids in achieving the densities required for fusion. A documentation system has been developed which is used to record both classical interferograms of solid IF fuel layers within the container and then holographic interferograms of plasma as the container implodes. This optical system has the advantages of visible and UV utility, 2–4-µm resolution, and a low space requirement. Both systems share a catadioptric objective lens and a refractive relay lens. The visible classical interferometric beam and the UV pulsed holographic probe follow different off-axis paths within the object cone of the lenses. While the solid layer is being formed, the beam is diverted to a shearing cube interferometer using a lens-mirror assembly on a sliding stage. This assembly then slides out of the way before the implosion to admit the UV probe to the holographic camera, which records four holographic interferograms of the imploding plasma separated in time by 40–400 ps. The two operational modes, shearing interferometer and holographic, are serial; switching from one to the other requires only seconds.","PeriodicalId":422579,"journal":{"name":"International Laser Science Conference","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1987-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123644883","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

Measurements of subpicosecond laser-produced plasmas 亚皮秒激光产生等离子体的测量

International Laser Science Conference Pub Date : 1987-09-25 DOI: 10.1063/1.36720

H. Milchberg, R. Freeman, S. Davey

引用次数: 1

Multibeam Borrmann effect in crystalline gamma-ray lasers 晶体伽玛射线激光器中的多束博尔曼效应

International Laser Science Conference Pub Date : 1987-09-25 DOI: 10.1364/ils.1986.tud2

J. Hutton, G. T. Trammell, J. P. Hannon

{"title":"Multibeam Borrmann effect in crystalline gamma-ray lasers","authors":"J. Hutton, G. T. Trammell, J. P. Hannon","doi":"10.1364/ils.1986.tud2","DOIUrl":"https://doi.org/10.1364/ils.1986.tud2","url":null,"abstract":"The effects of crystallinity are of crucial importance in considerations regarding gamma-ray lasers, bringing in new elements of laser theory which could well prove decisive in determining whether lasing can or cannot be achieved. Certain multibeam Borrmann eigenmodes of the radiation field within a perfect crystal containing resonant Mossbauer nuclei exhibit much less photoabsorption and much stronger coupling to the nuclei (provided the nuclear transition is of multipolarity M1 or higher) than do the single plane wave channels of an amorphous system (or equivalently, off-Bragg in the crystal). These modes offer the possibility of achieving lasing with orders of magnitude less population inversion density than would otherwise be the case, provided a nondestructive means is found to achieve a population inversion. The radiation in these modes would emerge from the crystal in a number of well-defined beams, each collimated by Bragg diffraction to an angular divergence of from 10-5to 10-4 rad. The properties of these multibeam modes as they relate to gamma-ray lasers, as well as the effects of crystallinity on the optics of systems which decay by superradiant rather than stimulate demission, are discussed.","PeriodicalId":422579,"journal":{"name":"International Laser Science Conference","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1987-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128960646","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

Four-atomic rare-gas halide exciplexes and their impact on high-power laser kinetics 四原子稀有气体卤化物复合物及其对大功率激光动力学的影响

International Laser Science Conference Pub Date : 1987-09-25 DOI: 10.1063/1.36770

R. Sauerbrey, F. Tittel, Y. Zhu, W. Wilson

{"title":"Four-atomic rare-gas halide exciplexes and their impact on high-power laser kinetics","authors":"R. Sauerbrey, F. Tittel, Y. Zhu, W. Wilson","doi":"10.1063/1.36770","DOIUrl":"https://doi.org/10.1063/1.36770","url":null,"abstract":"This talk presents spectroscopic evidence for the existence of the four-atomic rare gas halide exciplex Ar3F.1 It is identified through its broadband emission from electron beam excited high pressure Ar/F2 and Ar/NF3 mixtures at (435 ± 50) nm. The temporal behavior of the Ar3F emission as well as the Ar2F/Ar3F intensity ratio shows that the four-atomic species is produced by three-body collisions from Ar2F. However, it is easily destroyed by two-body collisions due to its small binding energy of < 0.2 eV, which can be inferred from the binding energy of \u0000 \u0000 \u0000 \u0000 \u0000 Ar\u0000 \u0000 3\u0000 +\u0000 \u0000 \u0000 \u0000 . The assignment of the blue emission continuum is further confirmed by the observation of a similar, previously unassigned emission from liquid Ar/F2 mixtures.2 Abnormalities in the Ar2F kinetics found in earlier investigations can now be partially explained by the formation of Ar3F, and partially by electron quenching of ArF and Ar2F. The existence of four-atomic rare gas halide exciplexes could impact on the absorption behavior of rare gas halide lasers. Recently, doubts have been raised as to whether the main absorber in the KrF lasers is, in fact, Kr2F, because the absorption cross section of this molecule appears to be too small. The possible formation of four-atomic exciplexes has to be taken into account for the determination of the absorption cross sections of trimers, as well as for the investigation of scalability of rare gas halide lasers.","PeriodicalId":422579,"journal":{"name":"International Laser Science Conference","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1987-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122174475","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

Application of semiconductor diode lasers to probe photodissociation dynamics 半导体二极管激光器在探测光解动力学中的应用

International Laser Science Conference Pub Date : 1987-09-25 DOI: 10.1063/1.36819

H. Haugen, W. Hess, S. Leone

引用次数: 2

Highly efficient emerald laser 高效绿宝石激光器

International Laser Science Conference Pub Date : 1987-08-01 DOI: 10.1364/JOSAB.4.001286

S. Lai

{"title":"Highly efficient emerald laser","authors":"S. Lai","doi":"10.1364/JOSAB.4.001286","DOIUrl":"https://doi.org/10.1364/JOSAB.4.001286","url":null,"abstract":"We report highly efficient quasi-cw laser operation in emerald. A crystal of 3 mm in length was pumped longitudinally by a krypton laser at 647.1 nm in a nearly concentric cavity. A64% output slope efficiency was measured with an output coupler of 1.16% transmission at 768 nm. The maximum output power reached 1.65 W with 3.63 W of pump power and was pump power limited. These results are among the highest in efficiency reported in laser-pumped Cr lasers operating in a quasi-cw mode. The calculated round trip laser loss was 0.11% in our sample, corresponding to 0.36%/cm. The laser quantum yield was 76%. A tuning range of 720-842 nm was achieved with a single element birefringent filter. Excitation spectra indicated that the relative fluorescence quantum yield was close to unity in the visible region of the emerald absorption bands. The calculated emission cross section was 3.3 × 10−20cm2 at 750 nm for the c-axis polarization. The excited state absorption was estimated from the laser results to be 20% of the stimulated emission cross section at 768 nm. The pump power threshold of the present laser was at 230 mW with a 60-µm pump beam radius. A scheme for the miniaturization of a tunable emerald laser to accept diode pumping is also discussed.","PeriodicalId":422579,"journal":{"name":"International Laser Science Conference","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1987-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127807214","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: 35

Generation of solitons in transient stimulated Raman scattering by optical phase shifts 光学相移瞬态受激拉曼散射中孤子的产生

International Laser Science Conference Pub Date : 1987-04-26 DOI: 10.1063/1.36867

D. C. MacPherson, J. Carlsten, Kai Drühl

引用次数: 16

Laser-induced surface chemical epitaxy: a novel thin film deposition technique 激光诱导表面化学外延:一种新型薄膜沉积技术

International Laser Science Conference Pub Date : 1987-04-15 DOI: 10.1364/ils.1986.thl40

C. Stinespring, A. Freedman

引用次数: 0