2019
DOI: 10.1364/ol.44.005477
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Detection of atomic oxygen in a plasma-assisted flame via a backward lasing technique

Abstract: In this Letter, we have investigated 845 nm lasing generation in atomic oxygen, present in a lean methane-air flame, using two-photon pumping with femtosecond 226 nm laser pulses, particularly focusing on the impact of nanosecond repetitively pulsed glow discharges forcing on the backward lasing signal. Characterizations of the backward lasing pulse, in terms of its spectrum, beam profile, pump pulse energy dependence, and divergence, were conducted to establish the presence of lasing. With plasma forcing of t… Show more

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Cited by 9 publications
(2 citation statements)
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“…The 845 nm fluorescence emitted upon relaxation to the intermediate 3s 3 S state was recorded [21]. Preliminary 2D fs-TALIF imaging of O-atoms recorded under same experimental conditions (10 kHz, 8.5 kV) have been reported in our previous work [22], where significant enhancement of O-atom fluorescence and thus concentration due to NRP discharge was observed. To study the temporal dynamics of this enhancement, 2D fs-TALIF images at different times within the discharge cycle of 100 µs were recorded using the same method as in [14] The temporal dynamics of O-atom fluorescence in a discharge cycle was studied using the spectroscopic method previously discussed.…”
Section: Study Of Atomic Oxygenmentioning
confidence: 55%
“…The 845 nm fluorescence emitted upon relaxation to the intermediate 3s 3 S state was recorded [21]. Preliminary 2D fs-TALIF imaging of O-atoms recorded under same experimental conditions (10 kHz, 8.5 kV) have been reported in our previous work [22], where significant enhancement of O-atom fluorescence and thus concentration due to NRP discharge was observed. To study the temporal dynamics of this enhancement, 2D fs-TALIF images at different times within the discharge cycle of 100 µs were recorded using the same method as in [14] The temporal dynamics of O-atom fluorescence in a discharge cycle was studied using the spectroscopic method previously discussed.…”
Section: Study Of Atomic Oxygenmentioning
confidence: 55%
“…In air containing mixtures, atomic O produced either by electron impact reactions or by other mechanisms (see Sect. 3), has a strong impact on combustion [197,198]. For hydrocarbon-air mixtures, atomic H, as well as OH radicals, has been shown to be involved in combustion enhancement [199,200].…”
Section: Chemical Effectmentioning
confidence: 99%