Pulsed-Molecular-Nitrogen Laser Theory

Gerry, Edward T.

doi:10.1063/1.1754242

Cited by 115 publications

(14 citation statements)

References 2 publications

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“…The problem of calculating the excitation rates to the laser levels in the nitrogen laser has been dealt with in [9][10][11]16]. In the present work two methods were used in accordance with [16].…”

Section: 3 Pumping Calculationsmentioning

confidence: 99%

“…In the present work two methods were used in accordance with [16]. One method, based on electrical measurements, resembles the outlines in [9][10][11], although the detailed approach is different, including the use of more recent cross-section data. The other method is based on measurements of spontaneous emission.…”

Section: 3 Pumping Calculationsmentioning

confidence: 99%

“…Power outputs from nitrogen lasers have previously been calculated by Gerry 1,9] and All et al rl0, 11] with an approximate method assuming saturated power density throughout the laser. This method is very simple and requires knowledge only of the excitation rates to the laser levels and the lifetimes.…”

Section: Calculations Of Stimulated Emissionmentioning

confidence: 99%

“…References [1][2][3][4][5][6][7][8] describe transversely excited nitrogen lasers. Nitrogen laser theory is dealt with in [9][10][11] and spectroscopy on the stimulated emission may be found in [12,13].…”

Section: Introductionmentioning

confidence: 99%

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Time-resolved analysis of a transversely excited nitrogen laser

Andersson¹,

Borgstrom²

1974

Opto-electronics

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Time-resolved measurements have been made of stimulated and spontaneous emission, voltage and current in a transversely excited nitrogen laser giving 50 kW peak power at 337 nm. The excitation rates to the laser levels were calculated from literature data using the results of electrical measurements, a check being obtained from measurements of spontaneous emission. The Druyvesteyn electron energy distribution gives better agreement with measurements than the Maxwellian. Laser pulses were calculated by solving numerically the space-dependent rate equations for population and photon number densities. Recent literature data on the transition probabilities and the pressure-dependence of the lifetime of the upper laser level were introduced into the calculations. The formation of a thin discharge channel was found to be essential for the high gain achieved. The onset of stimulated emission as observed on oscilloscope pictures was found to have a delay of the order of 1 ns in relation to the onset of current and spontaneous emission. This delay was confirmed by the calculations and explained as the time required to build up the population inversion and radiation density.

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Section: 3 Pumping Calculationsmentioning

confidence: 99%

Section: 3 Pumping Calculationsmentioning

confidence: 99%

Section: Calculations Of Stimulated Emissionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Time-resolved analysis of a transversely excited nitrogen laser

Andersson¹,

Borgstrom²

1974

Opto-electronics

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“…A lot of publications is devoted to investigations and creation of nitrogen lasers, several of which are considered in the review [7] where various designs of discharge chambers and excitation systems are described. The mechanism of inversion formation on transition C 3 Π u -B 3 П g was investigated well enough and described in [8,9]. It is based on idea of direct excitation of a nitrogen molecule by electronic impact from ground state X 1 Σ g + at which primary population of the upper level occurs according to a principle of Franck-Condon.…”

Section: Introductionmentioning

confidence: 99%

Nitrogen, atomic fluorine and CO 2 lasers excited by a pulsed inductive discharge

2007

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The experimental investigations results of spectral, energy and temporal parameters of the first inductive N 2 , FI and CO 2 gas lasers are reported. The excitation system for formation of the achievement the pulsed cylindrical inductive discharge in gas mixtures is described. For the first time the nitrogen inductive laser (337.1 nm) with pulse power of 350 kW was created. The generation energy of 4.6 mJ with the pulse duration (FWHM) of 12±1 ns was achieved. The total efficiency of nitrogen inductive laser was 0.05 %. The laser beam has a ring form with an outer diameter of 43 mm, thickness of 1.5-2.0 mm and the divergence of 0.3 mrad. For FI inductive laser the lasing was observed on 8 lines (623-755 nm). The maximal output energy of 2.6 mJ was achieved in He:F 2 -100:1 gas mixture. The pulse duration was 80±1 ns (FWHM) that correspond to pulse power of 32 kW. The total efficiency of the FI inductive laser was 0.01 %. The ring laser beam has an outer diameter of 43 mm, thickness of 3.0 mm and the divergence of 0.4 mrad. For CO 2 (10.6 um) inductive laser the maximal output energy of 150 mJ was achieved in gas mixture He:N 2 :CO 2 -8:1:1. The pulse duration (FWHM) was 170 us that corresponds to a pulse power of 0.9 kW. The laser beam has a ring form with dimension of an outer diameter of 33 mm with the thickness about 6.0 -6.5 mm and the divergence of 4.0 mrad.

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