High-power IR lasers operating on Xe I transitions

Sereda, O. V.; Тарасенко, В. Ф.; Fedenev, Andrei V.; Yakovlenko, S. I.

doi:10.1070/qe1993v023n06abeh003100

Cited by 19 publications

(11 citation statements)

References 8 publications

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“…It can be seen that a substantial increase in gas temperature becomes possible if n increases. However, a more significant restriction on Tg may follow from other physical considerations, such as, for example, the necessity of avoiding appreciable thermal dissociation of ArXe + ions and a decrease in the dissociative-recombination-rate constant [9]. On the other hand, it is necessary to fulfill the condition for the upper limit of ne (2.4), which holds in this case as well.…”

Section: > (25)mentioning

confidence: 93%

Theoretical feasibility study of new high-efficiency continuous-wave lasers operating at electron transitions in the spectral regions from near ir to uv on the basis of unconventional mechanisms of forming the active gaseous media

et al. 2000

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This paper is a review of the results of theoretical studies related to the search for new mechanisms, which are not yet completely understood and have not been implemented so far, of forming the active laser media that offer the prospect of development of high-efficiency continuous-wave (cw) laser operating at electron transitions (in atoms or molecules) in a wide range of wavelengths (from near IR to UV). The main attention is paid to unconventional mechanisms of forming the population inversion of lasing-active levels. These mechanisms involve the intramultiplet (due to collisions with heavy particles) or ionization-induced (due to collisions with electrons) deactivation of the lowest lasing-active atomic level; the population of the upper lasing-active level as a result of three-body electron ion recombination induced by the presence of alkali impurity, with simultaneous intramultiplet decay of the lower level; the mechanism ensuring the lasing transitions between repulsing terms of the involved molecules; and the exchange of vibrational-electronic excitation (for example, exchange of two vibrational quanta of an excited hydrogen molecule for a single electronic quantum of the iodine atom).

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Section: > (25)mentioning

confidence: 93%

Theoretical feasibility study of new high-efficiency continuous-wave lasers operating at electron transitions in the spectral regions from near ir to uv on the basis of unconventional mechanisms of forming the active gaseous media

et al. 2000

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“…was pumped by a radially convergent e-beam from four cathodes~Abdullin et al, 1997!. Device two was used previously to investigate broadband emission and was similar to that described in Sereda et al 1993!. The accelerator made it possible to generate an e-beam with a cross section of 42 ϫ 1.5 cm 2 , a current density of 2.5 A0cm 2 , a current pulse duration at half amplitude of 50 ns, and an electron energy of 155 keV after crossing the separation foil.…”

Section: Experimental Technique and Measurement Proceduresmentioning

confidence: 99%

Efficient e-beam and discharge initiated nonchain HF(DF) lasers

2003

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The spectral and amplitude-temporal parameters of HF~DF! lasers pumped by nonchain chemical reactions initiated by radially convergent or planar e-beams and self-sustained discharge were studied. Intrinsic efficiency of the HF lasers up to ;10% was obtained for both excitation methods. It was shown that the high efficiency of an e-beam-initiated HF laser may be attained as a result of the simultaneous formation of atomic and molecular fluorine and of the participation of F 2 in population inversion. A laser pulse has a complex profile caused by the successive generation of P-lines and the overlap during the radiation pulse of both the rotational lines of the same vibration band and of individual vibration bands. Experimental conditions providing high intrinsic efficiency of a discharge nonchain HF~DF! laser are determined. Intrinsic efficiency of HF and DF lasers up to h in ; 10% and 7%, respectively, is obtained using excitation by inductive and LC generators in the SF 6 -H 2~D2 ! mixtures. High discharge uniformity obtained with the use of special shaped electrodes along with uniform UV preionization is a key parameter for improving the intrinsic efficiency of discharge HF~DF! lasers. It was found that in this excitation condition, output spectra of the HF laser significantly widen and cascade laser action on some rotational lines of the vibrational transitions of HF molecules n~3-2! r n~2-1! r n~1-0! is observed. This can explain the high intrinsic efficiency obtained. Specific output of the discharge HF laser over 8 J0L~140 J0Lϫatm! and total laser efficiency h t ; 4.5% were achieved. For the discharge DF laser, specific output and total efficiency were as high as 6.5 J0L and 3.2%, respectively.

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“…Therefore, if the electron density is too high, the levels will be driven to Boltzmann equilibrium, 6,8,10,12,14 no inversion is possible, and no lasing will occur. Therefore, if the electron density is too high, the levels will be driven to Boltzmann equilibrium, 6,8,10,12,14 no inversion is possible, and no lasing will occur.…”

Section: B Efficiency E-beam Power Deposition and Electron Densitymentioning

confidence: 99%

“…It was believed to be pumped solely by electron collisional excitation. It has since been investigated by several groups [5][6][7][8][9][10][11][12][13][14][15][16] in Russia, The Netherlands, and also in the United States. Thus, this atomic xenon laser is usually referred to as the "Ar-Xe laser."…”

Section: Introductionmentioning

confidence: 99%