On the influence of a strong pump-field ellipticity on the third harmonic generation

Vagin, K. Yu.; Ovchinnikov, K. N.; Silin, V. P.

doi:10.1070/qe2004v034n03abeh002616

Cited by 4 publications

(5 citation statements)

References 3 publications

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“…It was demonstrated in [81,82,157,210,[232][233][234][235][236][237][238][239][240][241] that the electric stability of the EBSD increases when adding a small amount of carbon monoxide or hydrogen, specific input energy per molecular component being much higher at higher partial pressure of oxygen and rising to 6.5 kJ (l atm) −1 . A pulsed EBSD laser facility with rather large active volume V = 18 litre was used for the study of the EBSD in pure oxygen and oxygen gas mixtures.…”

Section: Non-self-sustained Discharge It Was Indicated Inmentioning

confidence: 99%

Physics and engineering of singlet delta oxygen production in low-temperature plasma

Ионин

Кочетов

Napartovich

et al. 2007

J. Phys. D: Appl. Phys.

260

190

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An overview is presented of experimental and theoretical research in the field of physics and engineering of singlet delta oxygen (SDO) production in low-temperature plasma of various electric discharges. Attention is paid mainly to the SDO production with SDO yield adequate for the development of an electric discharge oxygen–iodine laser (DOIL). The review comprises a historical sketch describing the main experimental results on SDO physics in low-temperature plasma obtained since the first detection of SDO in electric discharge in the 1950s and the first attempt to launch a DOIL in the 1970s up to the mid-1980s when several research groups started their activity aimed at DOIL development, stimulated by success in the development of a chemical oxygen–iodine laser (COIL). A detailed analysis of theoretical and experimental research on SDO production in electric discharge from the mid-1980s to the present, when the first DOIL has been launched, is given. Different kinetic models of oxygen low-temperature plasma are compared with the model developed by the authors. The latter comprises electron kinetics based on the accompanying solution of the electron Boltzmann equation, plasma chemistry including reactions of excited molecules and numerous ion–molecular reactions, thermal energy balance and electric circuit equation. The experimental part of the overview is focused on the experimental methods of SDO detection including experiments on the measurements of the Einstein coefficient for SDO transition and experimental procedures of SDO production in self-sustained and non-self-sustained discharges and analysis of different plasma-chemical processes occurring in oxygen low-temperature plasma which brings limitation to the maximum SDO yield and to the lifetime of the SDO in an electric discharge and its afterglow. Quite recently obtained results on gain and output characteristics of DOIL and some projects aimed at the development of high-power DOIL are discussed.

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Section: Non-self-sustained Discharge It Was Indicated Inmentioning

confidence: 99%

Physics and engineering of singlet delta oxygen production in low-temperature plasma

Ионин

Кочетов

Napartovich

et al. 2007

J. Phys. D: Appl. Phys.

260

190

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“…In the previous experiments [12,13], when detecting SDO radiation at the wavelength 1.27 µm in the course of the EBSD pulse and just after it, strong luminescence not connected with SDO luminescence was observed. In the experiments described in this paper a similar luminescence, perhaps related to the NO 2 luminescence, was observed within the detected wavelength interval 1.24-1.30 µm.…”

Section: Time Behaviour Of the Sdo Concentrationmentioning

confidence: 88%

“…Excitation of the oxygen containing gas mixture in the steady regime was carried out by a pulsed e-beam sustained discharge (EBSD) by applying the EBSD facility described in [11][12][13].…”

Section: Experimental Facilitymentioning

confidence: 99%

“…A schematic of the experimental setup is presented in figure 1. A diffraction monochromator with spectral resolution ∼10 nm was used for spectral selection of the SDO luminescence [12,13].…”

Section: Experimental Facilitymentioning

confidence: 99%

“…However, the increase in the initial NO fraction up to 0.2% and higher does not influence the time behaviour of the SDO luminescence pulse. SDO production in the electric discharge strongly depends on the SIE [12,13]. The initial nitric oxide addition leads to the SIE decrease which is related to the conversion of NO into NO 2 (see section 4).…”

Section: Time Behaviour Of the Sdo Concentrationmentioning

confidence: 99%

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Influence of nitrogen oxides NO and NO₂on singlet delta oxygen production in pulsed discharge

Ионин¹,

Klimachev²,

Kozlov³

et al. 2008

J. Phys. D: Appl. Phys.

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The influence of nitrogen oxides NO and NO2 on the specific input energy (SIE) and the time behaviour of singlet delta oxygen (SDO) luminescence excited by a pulsed e-beam sustained discharge in oxygen were experimentally and theoretically studied. NO and NO2 addition into oxygen results in a small increase and decrease in the SIE, respectively, the latter being connected with a large energy of electron affinity to NO2. The addition of 0.1–0.3% nitrogen oxides was experimentally and theoretically demonstrated to result in a notable enhancement of the SDO lifetime, which is related to a decrease in the atomic oxygen concentration in afterglow. It was experimentally demonstrated that to get a high SDO concentration at the gas pressure 30–60 Torr for a time interval of less than ∼0.5 s one needs to add not less than 0.2% nitrogen oxides into oxygen. The temperature dependence of the relaxation constant for SDO quenching by unexcited oxygen was estimated by using experimental data on the time behaviour of SDO luminescence.

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Third-harmonic generation and scattering in combustion flames using a femtosecond laser filament

Zang

et al. 2018

Opt. Lett.

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Coherent radiation in the ultraviolent (UV) range has high potential applicability to the diagnosis of the formation processes of soot in combustion because of the high scattering efficiency in the UV wavelength region, even though the UV light is lost largely by the absorption within the combustion flames. We show that the third harmonic (TH) of a Ti:sapphire 800 nm femtosecond laser is generated in a laser-induced filament in a combustion flame and that the conversion efficiency of the TH varies sensitively by the ellipticity of the driver laser pulse but does not vary so much by the choice of alkanol species introduced as fuel for the combustion flames. We also find that the TH recorded from the side direction of the filament is the Rayleigh scattering of the TH by soot nanoparticles within the flame and that the intensity of the TH varies depending on the fuel species as well as on the position of the laser filament within the flame. Our results show that a remote and in situ measurement of distributions of soot nanoparticles in a combustion flame can be achieved by Rayleigh scattering spectroscopy of the TH generated by a femtosecond-laser-induced filament in the combustion flame.

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On the influence of a strong pump-field ellipticity on the third harmonic generation

Cited by 4 publications

References 3 publications

Physics and engineering of singlet delta oxygen production in low-temperature plasma

Physics and engineering of singlet delta oxygen production in low-temperature plasma

Influence of nitrogen oxides NO and NO₂on singlet delta oxygen production in pulsed discharge

Third-harmonic generation and scattering in combustion flames using a femtosecond laser filament

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On the influence of a strong pump-field ellipticity on the third harmonic generation

Cited by 4 publications

References 3 publications

Physics and engineering of singlet delta oxygen production in low-temperature plasma

Physics and engineering of singlet delta oxygen production in low-temperature plasma

Influence of nitrogen oxides NO and NO2on singlet delta oxygen production in pulsed discharge

Third-harmonic generation and scattering in combustion flames using a femtosecond laser filament

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Product

Resources

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Influence of nitrogen oxides NO and NO₂on singlet delta oxygen production in pulsed discharge