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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Applied physics 71 (2000), S. 255-260 
    ISSN: 1432-0630
    Keywords: PACS: 52.40.Nk; 52.50.JM; 61.80.Cb
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. Some closed expressions for the flight ranges of the spherical particle ejected from a laser-produced plasma target in buffer gas are given as a function of its initial velocity, diameter, and some parameters of the properties for gas and particle material. It is shown that when estimating the ranges of the particulates generated from the laser target, the decline of viscosity with the decrease of the gas pressure has to be considered.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Applied physics 52 (1991), S. 117-121 
    ISSN: 1432-0649
    Keywords: 42.60D
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A colliding pulse mode-locked ring dye laser, pumped by an all-line small frame Ar+ laser has been used to generate stable pulses as short as 49 fs with pulse duration and stability similar to those obtained with the usual configuration where a single line of the pump is used. The effects of cavity alignment on the absorber saturation are presented and explained in terms of an analysis of stability of the ring cavity.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1090-6487
    Keywords: 52.25.Nr ; 52.70.La ; 52.58.Hm
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract It is shown that in a dense, not very hot, multiply charged plasma the satellite structures of resonance lines can become more intense than the resonance lines themselves. Experimental and theoretical investigations show that the conditions under which the satellite structures dominate in the emission spectrum of the plasma are quite easily realized experimentally and, furthermore, apparently they will be the most typical case in investigations of compressed plasma regions in inertial-confinement fusion experiments and in the study of plasma produced by high-contrast pico-and femtosecond laser pulses.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 0392-6737
    Keywords: Plasma production and heating by laser beams ; X-ray and ψ-ray measurements
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary We present a detailed study of XUV and soft X-ray emission from Cu plasma produced by an excimer laser at intensitiesI L≦8·1011 W/cm2. The XeCl excimer laser (ψ≈308 nm) delivers pulses with energyE L≈2.3 J, temporal durationt L≈100 ns and brightnessB≧1014 W/cm2 sr. We recorded a spectral conversion efficiency η=0.5% eV−1 forI L=4·1011W/cm2 in the aluminium window at 73eV with a harder X-ray tail around ≈400eV. We also measured the dependence of X-ray signal on laser intensity and viewing angle. Experimental results have been compared with some analytical laser-plasma interaction models.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 9 (1987), S. 873-891 
    ISSN: 0392-6737
    Keywords: Lasing processes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto Si presentano le caratteristiche costruttive e operative di un laser a XeCl preionizzato a raggi X e funzionante in regime di scarica autosostenuta. Si sono ottenuti impulsi laser con energie specifiche di 3.3 J/l e durata di 150 ns. L’uniformità spaziale del fascio laser di dimensioni (3.5×3.5) cm2 è risultata migliore del 90%. La massima efficienza intrinseca raggiunta senza l’uso di un circuito esterno di preimpulso è stata del 3.6%. L’introduzione del preimpulso ad alta tensione per intensificare la preionizzazione ha consentito di migliorare l’accoppiamento in energia depositata nel mezzo attivo e di ottenere un punto di lavoro piú stabile a tensione di pompaggio piú bassa.
    Abstract: Резюме Описываются конструкция и характеристики рентгеновского предионизационного XeCl лазера. Были получены лазерные импульсы с удельной энергией 3.3 Дж/литр и длительностью 150 нс. Пространственная однородность лазерного пучка с размерами (3.5×3.5) см2 была лучше 90%. Была получена внутренняя эффективность вплоть до 3.6% без использования внешнего предимпульсного тока. Успешно опробовано введение предимпульса высокого напряжения для интенсификации предионизации. Получено улучшение связи энергии в активной среде и более надежные условия работы лазера при меньшем напряжении.
    Notes: Summary The construction and the operating characteristics of a X-ray preionized discharge XeCl laser are described. A specific laser output energy of 3.3 J/l with a pulsewidth of 150 ns and a spatial beam uniformity better than 90% in a (3.5×3.5) cm2 cross-section was achieved. Intrinsic efficiency up to 3.6% has been obtained without the use of an external prepulse circuit. A fast, high-voltage prepulse to intensify the preionization has been successfully tried out, obtaining a better energy coupling to the gas and more reliable conditions at lower working voltage.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 0392-6737
    Keywords: Excimer lasers ; Ultraviolet spectra
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Description / Table of Contents: Riassunto I coefficienti di guadagno a piccolo segnale e di assorbimento di un laser a eccimero XeCl, preionizzato a raggi X, sono stati misurati sia in funzione del tempo che della lunghezza d'onda. Inoltre sono stati ottenuti due valori per l'intensità di saturazione usando l'analisi di Rigrod sull'evoluzione dell'intensità fotonica all'interno della cavità e misure di guadagno in condizioni di saturazione.
    Abstract: Резюме Измеряются усиление малых сигналов и коэффициенты поглощения рентгеновского, предионизонного XeCl лазера с высокой однородностью. С высоким разрешением одновременно определяются временная эволюция и зависимость от длины волны. Получаются две различные оценки интенсивности насьшения, используя анализ внутриполостной интенсивности и измерения усиления.
    Notes: Summary The small signal gain and absorption coefficients of a high uniformity, X-ray preionized XeCl laser have been measured. Their time evolution and wavelength dependence have been simultaneously detected with high resolution. Two distinct estimates of the saturation intensity were obtained by means of a Rigrod-type analysis of the intracavity intensity and by using saturated gain measurements.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 14 (1992), S. 495-507 
    ISSN: 0392-6737
    Keywords: Electrical phenomena in gases ; Other laser system operation parameters (e.g. efficiency, lifetime, reliability, performance) ; Excimer lasers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary Some limitation problems for gas discharge excimer lasers, when scaled to a high pulsed energy output with high repetition rate are discussed. As an example, we present some experimental results obtained with an X-ray preionized (10×10×100) cm3 active volume, low-repetition-rate-operated gas discharge XeCl laser system.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 13 (1991), S. 1387-1398 
    ISSN: 0392-6737
    Keywords: Excimer lasers ; Electrical phenomena in gases ; Electric discharges
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary Some performances of an excimer discharge at the formative stage are calculated and compared to the experimental results obtained in a XeCl* laser device with a pin cathode without external preionization. We present a simplified discharge model for exploring the process of the preionization generated by the coronas in the cathode pin region.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 0392-6737
    Keywords: thermodynamics of plasmas ; Ionizing radiations (ultraviolet, X-rays, γ-rays, ions, electrons, positrons, neutrons, and mesons, etc) ; Biophysical instrumentation and techniques ; X-ray spectra ; PACS 42.55Gp ; Excimer lasers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary A large-aperture, long-pulse XeCl excimer laser has been used to generate a soft-X-ray plasma source. Several laser optical configurations have been employed to optimise X-ray emission, including positive-branch unstable resonators and injection by seeding the gain region of the laser with a small commercial excimer laser, resulting in power densities in the range 1012–1014 W cm−2. The characteristics of the plasma source for each different laser configuration and for different target materials are investigated. The most suitable source conditions (spectral energy distribution, time duration, etc.) for specific applications are discussed.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Physica C: Superconductivity and its applications 180 (1991), S. 77-80 
    ISSN: 0921-4534
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
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