<i>An Introduction to Gas Lasers: Population Inversion Mechanisms</i>

Willett, Colin S.; Lorents, D. C.

doi:10.1063/1.3023266

Cited by 33 publications

(4 citation statements)

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“…The role of NDC in gas discharge physics has been stressed by Lopantseva et ala (1979) (see also Petrushevich and Starostin 1981), who made both experimental and theoretical studies of instabilities in externally sustained discharges in Ar-N z and Ar-CO mixtures and in pure Ar. Investigations of the phenomenon are particularly important in relation to the operation of Ar-N, lasers (Searles 1974;Ault et ala 1974;Ault 1975;Bychkov et ale 1980), CO lasers (Willett 1974;Garscadden 1981) and diffuse discharge switches (Christophorou et ala 1982;Schoenbach et ale 1982), and to the detection of nuclear radiation (Mathieson and El-Hakeem 1979;Al-Dargazelli et ala 1981).…”

Section: Introductionmentioning

confidence: 99%

Model Calculations of Negative Differential Conductivity in Gases

Petrovic¹,

Crompton²,

Haddad³

1984

Aust. J. Phys.

114

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Negative differential conductivity in gases has been studied using simple models of elastic and inelastic collision cross sections for electron scattering. The use of such models has demonstrated features of the cross sections that lead to the phenomenon, and shown that it can occur without a Ramsauer-Townsend minimum (and even without a sharply rising momentum-transfer cross section) or a special combination of inelastic cross sections.

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Section: Introductionmentioning

confidence: 99%

Model Calculations of Negative Differential Conductivity in Gases

Petrovic¹,

Crompton²,

Haddad³

1984

Aust. J. Phys.

114

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“…The molecular CO 2 laser did not work with direct nuclear-pumping , while it does work with direct e-beam pumping (Willet 1974). 2.…”

Section: (A) Generation Vuv Fluorescence For Energy Conversion In Arecsmentioning

confidence: 97%

Nuclear driven flashlamps

Prelas

Boody²,

Miley

et al. 1988

Laser Part. Beams

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Due to the low power density of pumping schemes for nuclear-pumped lasers prior to 1978, a method of utilizing the efficient production of narrow band fluorescence from excimers was developed. This method has since been referred to as a nuclear driven flashlamp. It is possible to achieve sufficient power densities, when combining the flashlamp with novel techniques of reactor/laser interfaces, to drive efficient, high power lasers directly with products from nuclear reactions.

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“…T he form er can be calculated from [25], and the latter from an expression p roposed by G riem [27]. U nder our experim ental conditions, calculations show that th e last term is dom inant.…”

Section: I L a S E R G A I Nmentioning

confidence: 99%

“…L aser levels are m ainly populated by electron im pact and cascade recom bination, and their relative w eights differ for different ions. We w ill restrict o u r analysis to the optically allow ed transitions since their cross sections m aintain a large value for a m uch broader range than the optically forbidden ones [25]. B esides, calculations show that the upper laser level has a stronger transition probability to the low er laser level than to the rest o f the levels.…”

Section: P U M P I N G P R O C E S S E Smentioning

confidence: 99%

Excitation mechanisms and characterization of a multi-ionic xenon laser

Sobral

Raineri

Schinca

et al. 1999

IEEE J. Quantum Electron.

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The emission characteristics of an ultraviolet-visible pulsed multi-ionic xenon laser were studied through time-resolved spectroscopy and the results were interpreted using a collisional radiative theoretical model. This analysis includes more than 20 laser lines belonging to several ionic species (Xe III VIII). Depending on the experimental conditions, different temporal distributions of the laser lines and their corresponding sponta neous emissions can be observed. In particular, laser emission presents temporal oscillations near threshold. Pumping processes for the laser transitions have been analyzed by using this model. Relativistic Hartree Fock calculations of laser level lifetimes and radiative transition probabilities were performed. Experimental laser gain for several transitions were obtained and compared with the theoretical values derived from the calculations.Index Terms Collisional-radiative model, gas discharge, gas lasers, xenon laser. I. In t r o d u c t i o n S IN C E TH E advent o f the laser, capillary discharges have been used to produce laser action in the ultraviolet (U V), visible, and infrared (IR) range [l]-[ 4 ]. In particular, lowpressure xenon plasm a excited by pulsed h igh-current-highvoltage electrical discharges produces high gain laser transi tions in the near U V and visible range. This laser output has been used for pum ping dye lasers [5] [7] and for studying injection locking phenom ena in CW dye lasers [8 ], [9].B oth from a basic and practical point o f view , it is im portant to know w hich are the levels and ionic species involved in laser em ission. D uchow icz et al. [10] show ed that m ost visible laser em issions belong to Xe V w hile UV em issions belong in general to X e VTI. In recent w orks, m ost o f the unresolved laser lines w ere attributed to X e V [11], X e VII [12], and X e V III [13].

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An Introduction to Gas Lasers: Population Inversion Mechanisms

Cited by 33 publications

References 0 publications

Model Calculations of Negative Differential Conductivity in Gases

Model Calculations of Negative Differential Conductivity in Gases

Nuclear driven flashlamps

Excitation mechanisms and characterization of a multi-ionic xenon laser

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