Amplification of long and short pulses in the medium of a DF–CO<sub>2</sub>chemical laser

Agroskin, V. Ya.; Bravyi, B. G.; Vasiliev, G K; Kir'yanov, V I

doi:10.1070/qe1980v010n02abeh009895

Sov. J. Quantum Electron.

1980

DOI: 10.1070/qe1980v010n02abeh009895

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Amplification of long and short pulses in the medium of a DF–CO₂chemical laser

V. Ya. Agroskin¹,

B. G. Bravyi²,

G K Vasiliev³

et al.

Abstract: Poly(3-hexylthiophene) thin-film transistors with anodized high-dielectric constant () tantalum pentoxide (Ta 2 O 5 ) and spincoated poly(4-vinylphenol) (PVP) film dual insulator layers were demonstrated. The polymeric PVP layer covering the Ta 2 O 5 can considerably improve the transistor performance. The mobility was increased up to 3:07 Â 10 À2 cm 2 /(VÁs), which is much higher than that obtained by only using a PVP or Ta 2 O 5 single dielectric layer. The threshold voltage of the dual-insulator device was … Show more

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1982

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Pulsed DF and DF-CO2 laser performance

Dreiling

1987

Journal of Applied Physics

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A comprehensive set of pulsed DF and DF-CO2 laser performance measurements is presented as a function of gas mixture composition (F2, O2, D2, diluent, and CO2), laser threshold gain, and reaction initiation strength. All the data were collected on a 47-l device using flash photodissociation of F2 to initiate the D2/F2 chain reaction. For helium buffered mixtures, maximum DF laser energy was found to occur at the highest pressures investigated (760 Torr), where the least amount of O2 is required for stabilization of the D2-F2 mixture prior to initiation. The addition of N2 or NF3 is deleterious to DF laser performance. However, at low partial pressures (∼100 Torr) the performance of N2 or NF3 diluted mixtures is comparable to that of He mixtures, suggesting that N2 or NF3 may be acceptable alternatives to He diluent in some laser system designs. The maximum DF-CO2 transfer laser energy was found to be 40% higher than the corresponding DF laser energy for comparable gas mixtures without any CO2. As with DF, the DF-CO2 laser energy was found to scale with the pump rate parameter, PF2(F/F2)1/2, provided the partial pressure of CO2 was adjusted to maintain a constant ratio of PCO2/(PF2(F/F2)1/2)2. The presence of NF3 caused a strong decline in DF-CO2 laser output, which is believed to be due to the ν1, symmetric stretch absorption band of NF3 at 10.3 μm.

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Pulsed DF and DF-CO2 laser performance

Dreiling

1987

Journal of Applied Physics

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Shortening of pulses emitted by a chemical DF–CO₂laser

Grigor’ev¹,

Kalinovskii²,

Lavrov³

et al. 1982

Sov. J. Quantum Electron.

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Absolute term values of L i ( l~2 s n p )~P " and ( 1~2 p n p )~P states ( n = 3 , 4 , 5 ) and their corresponding transition probabilities for electric dipole decay are calculated by means of configuration interaction calculations approximately corrected for relativistic, radiative and mass polarisation effects. Only ls2pnp-ls2snp transitions ( n = 2, 3,4, 5 ) possess relatively high decay rates to be readily observed in the beam-foil source; however, the n = 5 transition at A = 5405.2(0.6) 8, has not yet been detected. Unobserved weak and very weak lines ((0.2) and 6469.8(0.8)A) are predicted. An earlier assignment of A = 8504 8, to ls2p3p+ ls2s4p is not confirmed (A = 8605.0(2.5) 8, at very weak intensity but within the range of detectability). Comparison of theoretical E l decay rates with experimental mean lifetimes suggests that autoionisation is by far the principal mode of decay for all these even-parity 4P states except ls2p2, thus explaining the scarce participation of 4~0 -4~ transitions in Li quartet spectra.

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Amplification of long and short pulses in the medium of a DF–CO₂chemical laser

Cited by 2 publications

References 3 publications

Pulsed DF and DF-CO2 laser performance

Pulsed DF and DF-CO2 laser performance

Shortening of pulses emitted by a chemical DF–CO₂laser

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Amplification of long and short pulses in the medium of a DF–CO2chemical laser

Cited by 2 publications

References 3 publications

Pulsed DF and DF-CO2 laser performance

Pulsed DF and DF-CO2 laser performance

Shortening of pulses emitted by a chemical DF–CO2laser

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Product

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Amplification of long and short pulses in the medium of a DF–CO₂chemical laser

Shortening of pulses emitted by a chemical DF–CO₂laser