Kinetics of the active medium of a laser with nuclear pumping of transitions in the oxygen atom

Karelin, A. V.; Simakova, O. V.

doi:10.1070/qe1998v028n09abeh001319

Cited by 3 publications

(7 citation statements)

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“…6-9 that the optimal energy deposition range shifts from [15][16][17][18][19][20] J/l up to [18][19][20][21][22][23][24][25] in experiment and from 10-15 J/l up to 10-20 J/1 in the calculation with a mixture pressure increasing from of N2 and H20 molecules with electrons. The causes of distinctions between experimental and calculating curve (1) we see in influence of impurities on kinetics of the Xe-laser.…”

Section: Results Of Optimizationmentioning

confidence: 99%

Optimization of generation parameters of the wide-aperture Xe laser pumped by an electron beam

et al. 2002

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The data on optimization of output parameters (output energy and laser efficiency) and distribution of laser radiation energy on the output window cross-section of the wide-aperture Xe-laser pumped by a radially-convergent e-beam with pulse duration of 0,5 s at the FWH1VI were obtained. It is shown experimentally, that the requirement of homogeneity of output laser radiation across the aperture limits the energy deposition value from below, and the requirement of maximal laser efficiency restricts the energy deposition value from above.In the experiment the maximal laser efficiency as 1,5-2 % was obtained at the specific energy deposition of 12-14 inJ/cm3atm. The calculations show that with cleaning of the operating mixture from molecular gases impurities the laser efficiency and energy output can be increased in 1 . 5-2 times. The negative influence of impurity gases at optimum range of pumping power is decreasing of electron temperature and as a consequence decreasing of the upper laser level pumping.

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Section: Results Of Optimizationmentioning

confidence: 99%

Optimization of generation parameters of the wide-aperture Xe laser pumped by an electron beam

et al. 2002

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“…It is one of the most promising NPLs in the IR region for high-power applications [4]. This laser has a high efficiency (maximum 8%) [5][6][7] and a low threshold [1,8]. It is a potentially high-energy (up to 50 kJ) NPL with pulse lengths of ∼10 ms [9].…”

Section: Introductionmentioning

confidence: 99%

“…Laser oscillation is observed for gas mixtures of Xe with other inert gases (He, Ar, Kr). Many experiments have been performed on the 1.73 µm line of Xe using an Ar(99.5%)-Xe(0.5%) gas mixture with total pressures ranging from 0.5 to 4 atm [1][2][3][4][5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

“…The pumping scheme of the Ar-Xe laser is interesting for studying gas kinetic processes [6,[8][9][10] of recombination lasers in cold, dense plasmas [12]. The laser operates between the 5d and 6p manifolds, showing complex phenomena caused by the several competing laser lines in the near-IR region.…”

Section: Introductionmentioning

confidence: 99%

“…Often, peak laser intensity is reached prior to the peak of the pumping power [13,14]. Also, the time dependence of laser output power seems to be irreproducible when comparing various similar experiments described in the literature [6,[13][14][15]. The problem of limited reproducibility of the laser pulse suggests that there are factors which strongly influence the performance of the laser but which are not yet fully understood.…”

Section: Introductionmentioning

confidence: 99%

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Influence of water vapour impurities on the atomic Xe laser

Tomizawa

Salvermoser

Wieser

et al. 2000

J. Phys. B: At. Mol. Opt. Phys.

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The influence of water vapour impurities on the output power of the 1.73 µm 5d[3/2] 1 -6p[5/2] 2 Xe I laser has been studied. The laser gas was a mixture of 99.5% Ar and 0.5% Xe with a total pressure of 500 mbar and was pumped by 50 µs long 100 MeV 32 S 9+ heavy ion beam pulses. The gas remained essentially at room temperature during the pumping pulses. A significant reduction of laser power was observed when water vapour at a concentration of more than 10 14 cm −3 was added. A simple model assuming electron attachment and collisional quenching by water vapour as the dominant causes for reduced laser intensity was used to fit the experimental data. We obtained a rate constant for quenching the upper laser level (K Q H 2 O ) of 4 × 10 −9 cm 3 s −1 , and a ratio of the rate constant of electron attachment to water vapour to total recombination rate of 6 × 10 −16 cm 3 .

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