Pulsed chemical oxygen — iodine laser initiated by a transverse electric discharge

Vagin, N. P.; Yuryshev, Nikolai N

doi:10.1070/qe2001v031n02abeh001899

Cited by 16 publications

(8 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This suggests that electron-impact processes play a significant role during the discharge. Especially, the concentration of iodine atom used as the active medium of COIL has been reached the order of 10 15 cm À3 at end of the discharge, which is similar to the experimental results obtained by Li 4 and Vagin et al 6 The average energy cost of the iodine atoms produced is about 50.3 eV/atom. In the voltage-off phase, due to electron-ion and ion-ion recombination processes, as well as the quenching of the excited states (processes 14-23 and 36-39 in Table I) the densities of the charged particles and excited states decrease continuously.…”

Section: A Characteristics Of He/cf 3 I Pulsed Dischargesupporting

confidence: 86%

Numerical study of He/CF3I pulsed discharge used to produce iodine atom in chemical oxygen-iodine laser

et al. 2013

View full text Add to dashboard Cite

Articles you may be interested inEmission spectroscopy of a microhollow cathode discharge plasma in helium-water gas mixturesThe pulsed discharge for producing iodine atoms from the alkyl and perfluoroalky iodides (CH 3 I, CF 3 I, etc.) is the most efficient method for achieving the pulse operating mode of a chemical oxygen-iodine laser. In this paper, a one-dimensional fluid model is developed to study the characteristics of pulsed discharge in CF 3 I-He mixture. By solving continuity equation, momentum equation, Poisson equation, Boltzmann equation, and an electric circuit equation, the temporal evolution of discharge current density and various discharge products, especially the atomic iodine, are investigated. The dependence of iodine atom density on discharge parameters is also studied. The results show that iodine atom density increases with the pulsed width and pulsed voltage amplitude. The mixture ratio of CF 3 I and helium plays a more significant role in iodine atom production. For a constant voltage amplitude, there exists an optimal mixture ratio under which the maximum iodine atom concentration is achieved. The bigger the applied voltage amplitude is, the higher partial pressure of CF 3 I is needed to obtain the maximum iodine atom concentration. V C 2013 AIP Publishing LLC [http://dx.

show abstract

Section: A Characteristics Of He/cf 3 I Pulsed Dischargesupporting

confidence: 86%

Numerical study of He/CF3I pulsed discharge used to produce iodine atom in chemical oxygen-iodine laser

et al. 2013

View full text Add to dashboard Cite

show abstract

“…Vagin et al 5,6 tested a pulsed COIL with production of iodine atoms by a pulsed electric discharge. They obtained 10 s laser pulses and achieved an iodine atom number density of 1.8 ϫ 10 15 cm −3 .…”

Section: Introductionmentioning

confidence: 99%

Properties of O2(Δ1)–I(P21/2) laser medium with a dc glow discharge iodine atom generator

Mikheyev

Azyazov

2008

Journal of Applied Physics

View full text Add to dashboard Cite

Experiments were carried out in a flow cell apparatus under conditions corresponding to those of a typical oxygen-iodine laser. The cell was equipped with a chemical jet type singlet oxygen generator and an electric discharge for the production of iodine atoms. The properties of the discharge generator and the active medium were studied using laser-induced fluorescence and emission spectroscopy. I2 or CH3I entrained in a carrier flow of Ar were used as atomic iodine precursors. About 50% of the iodine contained in CH3I molecules was extracted in the generator. 2.6% of the electric power loaded into the discharge was used in CH3I dissociation. Right after the discharge 80%–90% of the iodine flow consisted of atoms. However, due to recombination during transport, only 20%–50% of atoms remained at the point of injection into the oxygen flow. A straightforward comparison of two methods of oxygen-iodine medium production—conventional, by means of I2 dissociation in the singlet oxygen flow and with iodine atoms produced externally in the electric discharge—was performed. It was found that the lifetime for the energy stored in singlet oxygen was about 30% longer, when atomic iodine was produced from CH3I in the discharge, as compared to the conventional chemical dissociation of I2 in the singlet oxygen flow.

show abstract

“…The motivations for investigation of the pulsed chemical oxygen-iodine laser based on the jet singlet oxygen generator are the promising results obtained in investigation of the features of pulsed COIL initiation with transverse discharge [1], as well as results of numerical analysis and experimental study of COIL with generation of singlet oxygen via photolytic ozone decomposition [6]. It was shown that pulsed COIL output energy increased linearly with the growth of the oxygen pressure.…”

Section: Pulsed Coil Based On the Jet Sogmentioning

confidence: 99%

Pulsed COIL with volume generation of iodine atoms in electric discharge

Yuryshev

Vagin

Konoshenko

et al. 2002

Gas and Chemical Lasers and Intense Beam Applications III

View full text Add to dashboard Cite

The method of volume generation of iodine atoms to obtain the pulsed mode of COIL is the most effective by the ratio of pulsed power to cw one at the same flowrate of chemicals. The electric discharge is a very convenient tool to produce iodine atoms in an active medium. The electrical efficiency close to 100% was obtained when longitudinal glow discharge was used. The investigation of both influence of the discharge gap length on the performance of pulsed COIL initiated with longitudinal discharge and transverse discharge initiated pulsed COIL based on the Jet Singlet Oxygen Generator were performed. The lasing of Jet SOG based pulsed COIL has been obtained for the first time. The operation pressure of 17 Torr at oxygen partial pressure of 7 Torr in the laser cavity has been obtained The temperature parameters of active medium being under electric discharge initiation were analyzed. The active medium temperature growth was shown to be responsible for decrease of specific output energy in discharge initiated COIL unlike that for photolytic initiation.

show abstract

Pulsed chemical oxygen — iodine laser initiated by a transverse electric discharge

Cited by 16 publications

References 10 publications

Numerical study of He/CF3I pulsed discharge used to produce iodine atom in chemical oxygen-iodine laser

Numerical study of He/CF3I pulsed discharge used to produce iodine atom in chemical oxygen-iodine laser

Properties of O2(Δ1)–I(P21/2) laser medium with a dc glow discharge iodine atom generator

Pulsed COIL with volume generation of iodine atoms in electric discharge

Contact Info

Product

Resources

About