How many O2(Δ1) molecules are consumed per dissociated I2 in chemical oxygen-iodine lasers?

Rybalkin, V.; Katz, A.; Waichman, Karol; Vingurt, Dima; Dahan, Z.; Barmashenko, Boris D.; Rosenwaks, Salman

doi:10.1063/1.2221903

Cited by 11 publications

(4 citation statements)

References 11 publications

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“…This would reduce the fraction of O 2 ͑a 1 ⌬͒ yield lost to dissociate iodine, nO 2 ͑a 1 ⌬͒ +I 2 →¯→ nO 2 +I+I, where n Ϸ 4 and increases at low I 2 concentrations. 11 Studies of iodine dissociation, as well as increasing gain path and flow residence time in the discharge, i.e., scaling the pulsersustainer discharge volume, are currently underway.…”

mentioning

confidence: 99%

Effect of nitric oxide on gain and output power of a non-self-sustained electric discharge pumped oxygen-iodine laser

Hicks

Bruzzese

Lempert

et al. 2007

Applied Physics Letters

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This letter discusses the effect of nitric oxide on gain and output power of a pulser-sustainer discharge excited oxygen iodine laser. Adding small amounts of NO to the laser mixture ͑a few hundreds of ppm͒ considerably increases gain and output power due to ͑i͒ O atom titration and resultant slower I * atom quenching and ͑ii͒ improved stability of the dc sustainer discharge, which allows stable operation at significantly higher discharge powers. Gain on the 1315 nm iodine atom transition and laser power in the M = 3 transverse laser cavity are 0.049% / cm and 1.24 W, at a flow temperature of T = 100 K.

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confidence: 99%

Effect of nitric oxide on gain and output power of a non-self-sustained electric discharge pumped oxygen-iodine laser

Hicks

Bruzzese

Lempert

et al. 2007

Applied Physics Letters

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“…The dissociation of I in the presence of singlet oxygen is not fully understood, but it occurs via a sequence of energy transfer events involving O (a), excited states of I , I* and I [22][23][24][25]. The energy consumed by this process can be assessed by determining the average number of O (a) molecules needed to dissociate one I molecule, (9) Values for fall in the range of 4-6 depending on the conditions [23][24][25]. This number is variable because excited intermediates are formed, and dissociation competes against processes that deactivate the intermediates.…”

Section: Basic Principles Of Discharge Oxygen-iodine Lasersmentioning

confidence: 99%

“…Initial attempts to determine this rate constant in a pulsed photochemistry experiment produced a much lower estimate, but subsequent measurements have provided results that are consistent with the modeling estimates. Most recently, Mikheyev et al [32] used photolysis of N O/I mixtures to investigate the quenching rate constant for the temperature range from 293 to 360 K. O( P) atoms were produced by the photo-initiated reaction sequence (24) (25) while singlet oxygen was generated by the secondary reaction (26) Iodine atoms were produced by I photodissociation and from the secondary reactions of I with O( P) atoms. Subsequent excitation of I by O (a) led to I( P formation, with I( P concentrations monitored using timeresolved 1315 nm emission.…”

Section: Kinetics Issuesmentioning

confidence: 99%

Recent advances in the development of discharge‐pumped oxygen‐iodine lasers

Heaven

2010

Laser & Photonics Reviews

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Chemical oxygen-iodine lasers are unique in their ability to generate high-power beams with near diffraction limited beam quality. The operating wavelength, 1.315 μm is readily transmitted by the atmosphere and compatible with fiber optics beam delivery systems. However, applications of the laser are severely limited by logistical problems associated with the complex chemistry used to power the device. Electrical or microwave discharge excitation of oxygen-iodine lasers offers an attractive alternative that eliminates the chemical power generation problems and has the possibility of closedcycle operation. A discharge oxygen-iodine laser was first demonstrated in 2005. Since that time the power of the device has been improved by a factor of 400 and much has been learned concerning the physics and chemistry of the discharge driven system. Although our current understanding of the chemical kinetics is incomplete, parametric studies of laser performance show considerable promise for further scaling. This article reviews the basic principles of the discharge oxygen iodine laser, summarizes the most recent advances, and outlines some of the unresolved questions regarding the production and removal of excited species in the gas flow.

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“…. → n • O 2 + I + I, where n ≈ 4 and increases at low I 2 concentrations [2]. Therefore iodine vapour dissociation prior to injection, using an auxiliary electric discharge, may potentially reduce SDO loss to dissociate iodine injected into the main flow and thereby increase the amount of SDO available for energy transfer to iodine atoms.…”

mentioning

confidence: 99%

Effect of iodine dissociation in an auxiliary discharge on gain in a pulser-sustainer discharge excited oxygen–iodine laser

Hicks¹,

Bruzzese²,

Adamovich³

2009

J. Phys. D: Appl. Phys.

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The paper presents the results of iodine vapour dissociation measurements in a high voltage, nanosecond pulse duration, repetitively pulsed discharge, used as an auxiliary (‘side’) discharge in an electric discharge excited oxygen–iodine laser. The side discharge, sustained in a high-pressure iodine vapour/helium mixture remained stable in the entire range of experimental conditions. Iodine dissociation fraction generated in the side discharge and measured in the laser cavity is up to 50%. However, the experiments showed that additional iodine dissociation generated in the side discharge only moderately increases laser gain, by 10–15%. Parametric gain optimization by varying main discharge pressure, O2 and NO fractions in the flow, I2 flow rate, pulsed discharge frequency and sustainer discharge power, with the side discharge in operation produces gain up to 0.08% cm−1. Two parameters that critically affect gain are the energy loading per molecule in the discharge and the NO flow rate controlling the O atom concentration in the flow. In particular, operation at the main discharge pressure of 60 Torr results in significantly higher gain than at 100 Torr, 0.080% cm−1 versus 0.043% cm−1, due to higher discharge energy loading per molecule at the lower pressure. Laser output power measured at the gain optimized conditions is 1.4 W.

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How many O2(Δ1) molecules are consumed per dissociated I2 in chemical oxygen-iodine lasers?

Cited by 11 publications

References 11 publications

Effect of nitric oxide on gain and output power of a non-self-sustained electric discharge pumped oxygen-iodine laser

Effect of nitric oxide on gain and output power of a non-self-sustained electric discharge pumped oxygen-iodine laser

Recent advances in the development of discharge‐pumped oxygen‐iodine lasers

Effect of iodine dissociation in an auxiliary discharge on gain in a pulser-sustainer discharge excited oxygen–iodine laser

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