Investigation of some elementary processes in a vacuum-UV hydrogen laser discharge

Ross, W.; Florek, Stefan; Gatzke, J.

doi:10.1016/0030-4018(77)90118-3

Cited by 3 publications

(2 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The increase in the laser pulse duration is associated with transition to a four-level scheme of the active medium operation, predicted in [4,34], when the lower laser level X 1 Σ g + is quenched in collisions with components of the diffuse discharge plasma in processes of dissociation [31] and VT relaxation at a gas mixture pressure of the order of one atm. As a result, the lifetime of the population inversion increases with the laser pulse duration.…”

Section: Hydrogen Lasermentioning

confidence: 98%

“…It should be noted that in the conditions of high current densities, quenching of the B 1 Σ + u state in collisions with electrons becomes noticeable, which significantly reduces the ULL lifetime and the efficiency of the high-current excitation mode [31]. Probably for this reason, in the references cited above, the duration of the H 2 laser pulses was no more than 1-3 ns, and the output did not exceed 0.5 mJ.…”

Section: Hydrogen Lasermentioning

confidence: 99%

See 1 more Smart Citation

VUV lasing in diffuse discharges formed by runaway electrons

Panchenko,

Tarasenko,

Kozevnikov

2023

Laser Phys.

View full text Add to dashboard Cite

The parameters of stimulated emission in diffuse discharges formed in a sharply inhomogeneous electric field by runaway electrons in mixtures of rare gases with the addition of H2 and F2 at pressures up to 10 atm are studied. Efficient VUV lasing was obtained at wavelengths from 148 to 193 nm on the transitions of H2, F2 and exciplex ArF* molecules. It was shown that the addition of He buffer gas increases the pulse duration, while Ne addition improves the output energy of the VUV laser on the H2 Lyman band. A laser pulse duration over 10 ns and an output of 0.12 mJ were obtained. The diffuse discharge in mixtures of He with F2 was found to form as a result of successive ionization waves. It was shown that the laser pulse at 157 nm has three peaks, which correspond to the maxima of the diffuse discharge current. Therewith, the first or second peak of the laser radiation has the maximum intensity, depending on the amplitude of the conduction current in the primary ionization wave. A maximal F2* laser electrical efficiency of η 0 = 0.18% and an output of Q 157 = 3.8 mJ were obtained in a He–F2 gas mixture at pressure of 10 atm, which exceeds the efficiency of lasers of this type pumped by transverse volume discharges with UV preionization. Long-pulse operation of the ArF* laser was achieved in a He–Ne–Ar–F2 gas mixture. Lasing at 193 nm continued during two periods of the diffuse discharge current. The total duration of the laser pulse was as long as 40 ns, and the radiation energy at 193 nm was as high as 2 mJ from an active volume of 20 cm3.

show abstract

Section: Hydrogen Lasermentioning

confidence: 98%

Section: Hydrogen Lasermentioning

confidence: 99%