A high power N2-laser of long pulse duration

Rebhan, Ulrich; Hildebrandt, J.; Skopp, G.

doi:10.1007/bf00903212

Cited by 43 publications

(4 citation statements)

References 2 publications

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“…A N,-laser, whose construction is described in detail in Ref. [22], was used to generate the atomic beam. At t = 0, the N,-laser beam with a pulse duration of about 2511s (FWHM) was reflected by a UV-mirror into the z-direction.…”

Section: Experimental Apparatusmentioning

confidence: 99%

“…Here, I,(th) is estimated from eqs. (21)(22), and X C, Xj, + Id,?, where Xj, is the excitation rate of electric dipole-allowed transitions between the ground state and the intermediate 2l-state [32], and I,, is the direct ionization rate from the ground state [31] Then we took the average value of I,, over z as the effective ionization rate coefficient &(exp). In order to examine the reliability of the density determination by the LIF-method in the presence of the plasma, the Ze,-measurements for Zr I were also performed under several plasma conditions in the UV region (& = 296.087 nm, &, = 302.275 nm).…”

Section: Effective Ionization Rate Coeficients Of Ai I and Zr I Atoms...mentioning

confidence: 99%

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Investigation of effective ionization rate coefficients of Al I and Zr I in a plasma using laser produced atomic beams

Chu

Kunze²

1990

Phys. Scr.

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Al I and Zr I atomic as well as Zr II ionic beams were produced by laser irradiation of Al and Zr targets. The beams were injected into a plasma, and effective ionization rate coefficients were derived by analyzing the beam densities both with and without the plasma present. Because of the large number of intermediate levels, the Zr I atoms are ionized much faster than the Al I atoms under the same plasma conditions, in spite of the fact that the ionization energy from the ground state for Zr I is higher than that for Al I. The results are compared with theoretical effective ionization rate coefficients assuming a simplified two-step ionization process. For Zr I, the measured effective ionization rate coefficients were found to be two to five times the sum of the excitation rate coefficients for electric dipole-allowed transitions and for Al I one to three times. These results may represent a limiting case, in which the effective ionization rate coefficient is nearly equal to the sum of all excitation rate coefficients including electric dipole-allowed as well as multipole and forbidden transitions.

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Section: Experimental Apparatusmentioning

confidence: 99%

Section: Effective Ionization Rate Coeficients Of Ai I and Zr I Atoms...mentioning

confidence: 99%

Investigation of effective ionization rate coefficients of Al I and Zr I in a plasma using laser produced atomic beams

Chu

Kunze²

1990

Phys. Scr.

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“…With the low (<1 )-internal impedance Blumlein driver, the commercial N 2 laser operates usually with voltages ranging from 8 to 14 kV and pressures between 70 and 250 torr of N 2 . Under optimum conditions, the laser provides pulses with energies of <30 mJ and the width of the pulse not exceeding 19 ns [1].…”

mentioning

confidence: 99%

“…The gas discharges formed in N 2 and/or air provides the N 2 laser gain medium. The preionization had to be applied to produce a semi-uniform glow-like column [1]- [4].…”

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confidence: 99%

Nitrogen Laser Emissions of Short and Long Durations Generated in Air

Kekez

Villeneuve

2020

IEEE Trans. Plasma Sci.

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This article describes two sets of experiments. An eight-stage, pulse-forming network (PFN) Marx generator of 50-internal impedance produces a "square"-shaped voltage waveform and induces multiphoton ionization, excitation of molecules and ions to generate laser pulses of long (<3 μs) and short (∼10 ns) durations in air, when the principal laser line of the N 2 laser at 337.1 nm was observed. The visible blue laser lines coming from the first negative band of N + 2 ions due to the B 2 + u →X 2 + g transition at 391.4 and 427.8 nm were studied. The wideband (300-800 nm) Schott BG 39 interference filter was also employed to examine whether some other lines participate in the emission being generated. The scaling law was derived describing the attenuation of the emission versus the distance for long-duration pulses (<3 μs) at 337.1 nm. The second set of experiments was introduced to support the data obtained. It offers information pertinent to the visible blue line emissions as well as to the photoionization processes, lighting phenomena, and processes occurring at high altitudes.

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Spatial and Temporal Behavior of a Laser Generated Titanium Plasma

Lira¹,

Castell²

1998

Plasma Physics

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A high power N2-laser of long pulse duration

Cited by 43 publications

References 2 publications

Investigation of effective ionization rate coefficients of Al I and Zr I in a plasma using laser produced atomic beams

Investigation of effective ionization rate coefficients of Al I and Zr I in a plasma using laser produced atomic beams

Nitrogen Laser Emissions of Short and Long Durations Generated in Air

Spatial and Temporal Behavior of a Laser Generated Titanium Plasma

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