60 J quasistationary electroionization laser on Xe atomic metastables

Basov, N G; Baranov, V.V.; Chugunov, A Yu; Danilychev, V. A.; Dudin, A Yu; Kholin, I V; Ustinovskii, N. N.; Zayarnyĭ, D A

doi:10.1109/jqe.1985.1072576

Cited by 50 publications

(11 citation statements)

References 15 publications

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“…Since the excitation cross sections are needed in a very wide range of energy starting from near-threshold region to high impact energies, we employed various distorted-wave and close-coupling approaches to obtain the cross sections. (1) 12.907 7 Ar(4p) (2) 12.907 8 Ar(3d) 13 The semi-relativistic Breit-Pauli R-matrix (BPRM) method using a 43-state model was used to calculate the low-energy excitation cross sections [22,23]. The 43-state model closely coupled the 31 states of neutral xenon with configurations 5p 6 , 5p 5 6s, 5p 5 6p, 5p 5 6d and 5p 5 7s, as well as 12 pseudostates generated from the 5p 5 6d configuration.…”

Section: Atomic Datamentioning

confidence: 99%

“…All the laser transitions originate from a 5d upper state and terminate on a 6p lower state. This laser has been demonstrated and investigated by several groups [1][2][3][4][5][6][7][8][9][10][11][12][13] but the detailed mechanism of population inversion is still poorly understood. It is generally believed that the upper 5d laser levels are overpopulated by electron dissociative recombination from the molecular ions ArXe + and Xe + 2 .…”

Section: Introductionmentioning

confidence: 99%

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Electron kinetics of the e-beam pumped Ar–Xe laser

Petrov

Giuliani

Apruzese

et al. 2007

J. Phys. D: Appl. Phys.

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Extensive electron collision data for Ar and Xe are assembled and employed to study the e-beam deposition in this noble gas mixture for application to the Ar–Xe laser. Nineteen states of Xe and thirteen of Ar are used for the atomic model. The electron energy distribution function is calculated from the Boltzmann equation using atomic cross sections for excitations from the ground states computed from atomic physics codes. The resulting electron distribution is then used to investigate the electron temperature, energy per electron–ion pair, ionization rates and excitation-to-ionization ratios for both species as a function of three parameters: the Xe mole fraction, the fractional ionization, and the power deposition per Ar atom. While the Ar ionization and excitation are fairly insensitive to these parameters, the rates for Xe, especially total excitation-to-ionization ratio, can vary with all three. Cross sections for excited to excited transitions among all the considered upper states in Xe are also calculated and transition rates, fitted to an Arrhenius form, are presented in tabular form. The assembled atomic data and calculated rates are useful for further detailed electron kinetics modelling of the Ar–Xe laser.

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Section: Atomic Datamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electron kinetics of the e-beam pumped Ar–Xe laser

Petrov

Giuliani

Apruzese

et al. 2007

J. Phys. D: Appl. Phys.

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“…The xenon laser has been operated at pressures of 0.5-16 atm in mixtures consisting of I 0.5-2% of xenon in rare gas buffers (Ar, He, Kr). Electric discharge [l], 121, electron beam ( e beam) 131, [4], e-beam sustained discharge [5], [6], and fission fragment [7] excitation at power depositions of < 10's W/cm3 atm to >MW's/cm3 . atm and pulse lengths of 10's ns to 5 ms have been investigated.…”

Section: Introductionmentioning

confidence: 99%

Impact of electron collision mixing on the delay times of an electron beam excited atomic xenon laser

Peters

Lan

Ohwa

et al. 1990

IEEE J. Quantum Electron.

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The atomic xenon (5d + 6 p) infrared laser has been experimentally and theoretically investigated using a short pulse (30 ns) high power (1-10 MW/cm3) coaxial electron beam excitation source. In most cases, laser oscillation is not observed during the e-beam current pulse. Laser pulses of 100's of ns duration are subsequently obtained, however, with oscillation beginning 60-800 ns after the current pulse terminates. Results from a computer model for the xenon laser reproduce the experimental values, and show that oscillation begins when the fractional electron density decays below a critical value of = 0.2-0.8 x lo6. These results lend credance to the proposal that electron collision mixing of the laser levels limits the maximum value of specific power deposition which may be used to efficiently excite the atomic xenon laser on a quasi-CW basis. Manuscript received May 2, 1990. The work of P. J. Peters and Y. F. Lan is part of the research program of the "Stichting voor Fundamenteel Onderzoek der Materie (FOM)," which is supported by the "Nederlandse organisatie voor Wetenschappelijk Onderzoek (NWO)". The work of M. Ohwa and M. J. Kushner was supported by Sandia National Laboratory.

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“…1). An intrinsic efficiency of about 5% with a maximum specific output energy of 8 J/liter was reported in 1985 by Basov et al [2]. Recently is was observed that an e-beam sustained system has the potential of about 9% intrinsic efficiency [3].…”

mentioning

confidence: 99%

“…Recently is was observed that an e-beam sustained system has the potential of about 9% intrinsic efficiency [3]. The laser operates in various modes such as an electric discharge mode [4,5], with electron-beam excitation [6,7], with an electron beam sustained discharge [2,3,8], fission fragment excited [9], and in a microwave discarge [10]. Power depositions of 10W/cm 3 • bar to 1 MW/cm 3 " bar, pumping pulse durations of 10ns-5 ms, and total gas pressures of 0.5-14bar in a mixture consisting of 0.01-10% of xenon in rare gas buffers (He, Ne, Ar, Kr) have been investigated.…”

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confidence: 99%

Spectral line competition in a coaxial electron-beam-pumped high pressure Ar/Xe laser

1991

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Abstract. In order to study the kinetic mechanism of the e-beam pumped Ar/Xe laser, the temporal profiles of individual laser lines during multiline oscillation have been measured as a function of power deposition (1-12MW/cm 3) and gas laser pressure (2-14bar) using a short pulse (30 ns) coaxial electron beam as excitation source. It was found that the optimum output energy at each pressure was obtained at the same specific power deposition.Strong line competition has been observed between the 2.65 and 1.73 ~tm transitions. In order to explain our results we suggest that besides electron collision mixing (ECM) between the 5d and 6p levels of Xe, there is also a redistribution between all 6p levels which strongly favours the lower levels at higher pumping densities. The atomic xenon infrared laser has attracted the attention of researchers since an electrical effÉciency of nearly 1% was reported for this laser by Newman and DeTemple using an electron beam preionized discharge [1]. The atomic xenon laser operates on six infrared transitions (1.73 ~tm-3.51 gm) between the 5d and 6p manifold (Fig. 1). An intrinsic efficiency of about 5% with a maximum specific output energy of 8 J/liter was reported in 1985 by Basov et al. [2]. Recently is was observed that an e-beam sustained system has the potential of about 9% intrinsic efficiency [3]. The laser operates in various modes such as an electric discharge mode [4,5], with electron-beam excitation [6,7], with an electron beam sustained discharge [2,3,8], fission fragment excited [9], and in a microwave discarge [10]. Power depositions of 10W/cm 3 • bar to 1 MW/cm 3 " bar, pumping pulse durations of 10ns-5 ms, and total gas pressures of 0.5-14bar in a mixture consisting of 0.01-10% of xenon in rare gas buffers (He, Ne, Ar, Kr) have been investigated. Since the most promising laser performance has been obtained in Ar/Xe mixtures with electron-beam pumping and electron-beam sustained discharge pumping, most experimental work has been carried out on those systems. Recently there has been increased interest in studying the kinetic mechanism [11]. As the atomic xenon laser * Permanent address: Institute of Electronics, Academia Sinica, Beijing, RR. China is a highly complicated laser system, little is understood about the fundamental kinetic mechanism which is responsible for the performance of the laser. In order to study the kinetic processes of the Ar/Xe laser, we have operated the laser with a short pulse table-top coaxial electron beam source. Measurements of the delay times of the various laser lines with respect to the pumping pulse as a function of different total gas pressures and power deposition rates have already been made [12].In this paper the temporal profiles of the individual laser lines have been studied in a large parameter space. The results of these measurements will be presented and discussed with respect to the line competition. We found

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60 J quasistationary electroionization laser on Xe atomic metastables

Cited by 50 publications

References 15 publications

Electron kinetics of the e-beam pumped Ar–Xe laser

Electron kinetics of the e-beam pumped Ar–Xe laser

Impact of electron collision mixing on the delay times of an electron beam excited atomic xenon laser

Spectral line competition in a coaxial electron-beam-pumped high pressure Ar/Xe laser

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