EOIL power scaling in a 1-5 kW supersonic discharge-flow reactor

Davis, Steven J.; Lee, Seonkyung; Oakes, David B.; Haney, Julie M.; Magill, John C.; Paulsen, D.; Cataldi, P; Galbally-Kinney, Kristin L.; Vu, Danthu; Polex, Jan; Kessler, William J.; Rawlins, W. T.

doi:10.1117/12.773786

Cited by 17 publications

(18 citation statements)

References 11 publications

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“…The lasing state I ‫ء‬ is produced by near resonant energy transfer with the singlet oxygen metastable O 2 ͑a 1 ⌬͒ ͓denoted hereafter as O 2 ͑ 1 ⌬͔͒. Subsequent efforts have demonstrated gain [3][4][5] and lasing [4][5][6] in other ElectricOIL configurations since the first demonstrations. Ionin et al 7 provided a comprehensive topical review of discharge production of O 2 ͑ 1 ⌬͒ and various ElectricOIL studies.…”

mentioning

confidence: 99%

Gain recovery in an electric oxygen-iodine laser

Zimmerman

Benavides

Palla

et al. 2009

Applied Physics Letters

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Recent investigations of an electric oxygen-iodine laser system have shown that computational modeling overpredicts the experimentally measured power output for similar gain conditions. This discrepancy is potentially due to an unknown reaction that competes with the forward pumping of I(P21/2) by O2(a Δ1). Measurements of gain recovery downstream of an operating laser cavity were performed. Modeling of this experiment shows that reducing the forward pumping rate by an effective factor of approximately 4 to simulate a competing mechanism results in the computational modeling matching the experimental gain recovery measurements, and in improved agreement between the measured and modeled laser power extraction.

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mentioning

confidence: 99%

Gain recovery in an electric oxygen-iodine laser

Zimmerman

Benavides

Palla

et al. 2009

Applied Physics Letters

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“…The viability of EOIL has been demonstrated through measurements of positive gain and lasing in a variety of laboratory systems at low to moderate discharge powers. [1][2][3][4][5][6][7][8] In particular, work reported at this conference describes detailed measurements of high beam quality 9 and scaling to unprecedented high gains and output powers 10 for EOIL test reactors.…”

Section: Introductionmentioning

confidence: 99%

“…To partially offset the I* quenching loss, it is necessary to carefully control the O concentration through titrations with NO 2 and/or NO [1][2][3][4][5] so that [O] is large enough to dissociate I 2 but small enough to minimize I* quenching.…”

Section: Introductionmentioning

confidence: 99%

Catalytic enhancement of singlet oxygen for hybrid electric discharge oxygen-iodine laser systems

et al. 2010

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We are investigating catalytically enhanced production of singlet oxygen, O 2 (a 1 Δ g ), observed by reaction of O 2 /He discharge effluents on an iodine oxide film surface in a microwave discharge-flow reactor at 320 K. We have previously reported a two-fold increase in the O 2 (a) yields by this process, and corresponding enhancement of I( 2 P 1/2 ) excitation and small-signal gain upon injection of I 2 . In this paper we report further observations of the effects of elevated temperature up to 410 K, and correlations of the catalytically generated O 2 (a) with atomic oxygen over a large range of discharge-flow conditions. We have applied a diffusion-limited reaction rate model to extrapolate the catalytic reaction rates to the highpressure, fast-flow conditions of the subsonic plenum of a supersonic EOIL test reactor. Using the model and the flow reactor results, we have designed and implemented a first-generation catalytic module for the PSI supersonic MIDJet/EOIL reactor. We describe preliminary tests with this module for catalyst coating deposition and enhancement of the small-signal gain observed in the supersonic flow. The observed catalytic effect could significantly benefit the development of high-power electrically driven oxygen-iodine laser systems.

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“…There are 4 types of discharge singlet oxygen generator (DSOG), which were used for successful DOIL experiments (i.e. laser oscillations or positive laser gain) -an RF discharge 1,2 , a pulse sustained DC discharge 3 , a MW cavity discharge 4 , and a MW swirl plasma jet 5 . Our concept of DSOG is based on a proposal 6 of a fast mixing of Ar hybrid RF/DC plasma jet with a neutral O 2 stream.…”

Section: Introductionmentioning

confidence: 99%

Hybrid RF/DC discharge generator of singlet oxygen for DOIL

Schmiedberger

Gregor

Jirásek

et al. 2013

XIX International Symposium on High-Power Laser Systems and Applications 2012

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Recent research on high-pressure hybrid radiofrequency/arc (RF/DC) generator of singlet oxygen for DOIL is presented. A stable hybrid RF/DC discharge with a diffusive arc root near the anode side was demonstrated experimentally under well defined conditions. A minimization of anode erosion and a non-equilibrium state of the arc plasma were achieved in this way. The RF discharge is used for the ignition of the DC arc and its sustainment. The hybrid discharge can be characterized as an RF sustained (i.e. non-self sustained in the pure DC mode) DC arc between a conventional glowing tungsten cone cathode and a cooled aluminum cylindrical anode with a diffusive arc mode. The diffusive mode of the arc is assisted by a plasma anode formed inside the aluminum anode channel due to the radiofrequency. The generation of singlet oxygen was achieved by a laterally symmetric injection of neutral oxygen in a mixture of O 2 +He+NO into the Ar+He plasma jet of the hybrid RF/DC plasmatron. An overview of basic characteristics and CFD modeling of some key gas flow phenomena are presented. The research is directed to experimental investigation and theoretical modeling of the hybrid plasma. In the case of its successful completion it will be used for pumping a discharge oxygen-iodine laser.

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EOIL power scaling in a 1-5 kW supersonic discharge-flow reactor

Cited by 17 publications

References 11 publications

Gain recovery in an electric oxygen-iodine laser

Gain recovery in an electric oxygen-iodine laser

Catalytic enhancement of singlet oxygen for hybrid electric discharge oxygen-iodine laser systems

Hybrid RF/DC discharge generator of singlet oxygen for DOIL

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