Experiment and modeling of a small-scale, supersonic chemical oxygen-iodine laser

Elior, A.; Barmashenko, Boris D.; Lebiush, E.; Rosenwaks, Salman

doi:10.1007/bf01090970

Cited by 20 publications

(12 citation statements)

References 21 publications

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“…Peak O 2 ͑ 1 ⌬͒ yields are obtained at relatively low power depositions ഛ1 W/cm 3 . In simulations of discharges with P d Ͻ 0.3 W / cm 3 the electron density did not consistently avalanche, and thus the discharge could not self-sustain.…”

Section: Scaling Of O 2 "mentioning

confidence: 99%

“…A four factor, four level full factorial computational experiment (256 cases) was run. Inlet velocities ranged from 500 to 5000 cm/ s, total pressures from 1 to 20 Torr, power depositions from 0.1 to 1.5 W / cm 3 , and O 2 fractions in He from 0.03 to 1. Although this design allows resolution of linear effects, two-, three-, and four-way interactions, all four variables were expected to have strong interactions that influence O 2 ͑ 1 ⌬͒ yield by changing the net amount of energy deposited into the oxygen species.…”

Section: Scaling Of O 2 "mentioning

confidence: 99%

“…[1][2][3][4][5][6] The conventional chemical oxygen-iodine laser (COIL) dissociates I 2 by collisions with O 2 ͑ 1 ⌬͒. Subsequent collisions with O 2 ͑ 1 ⌬͒ then excite the atomic iodine in a near resonant transfer to create a population inversion and lasing on the I͑ 2 P 1/2 ͒ → I͑ 2 P 3/2 ͒ transition.…”

Section: Introductionmentioning

confidence: 99%

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O 2 ( Δ 1 ) production in He∕O2 mixtures in flowing low pressure plasmas

Stafford

Kushner

2004

Journal of Applied Physics

272

200

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Chemical oxygen-iodine lasers (COIL) are attractive for diverse industrial applications because they are capable of high efficiency, high power operation, and because the 1.315 m wavelength can be transmitted through fiber optics and couples efficiently with most metals. Conventional COILs are pumped with O 2 ͑ 1 ⌬͒ that is generated by reaction of Cl 2 in a basic H 2 O 2 solution. Current trends in pumping COILs involve producing the O 2 ͑ 1 ⌬͒ in electric discharges, thereby circumventing the hazards, complexity, and weight associated with pumping and storing caustic liquids. In this work, we have investigated the scaling of O 2 ͑ 1 ⌬͒ yields with specific energy deposition in He/ O 2 mixtures in flowing radio frequency (rf) discharges at pressures of a few to tens of Torr using a global plasma kinetics model. We found that O 2 ͑ 1 ⌬͒ yield increases nearly linearly with specific energy deposition in O 2 molecules up to a few eV per molecule, with yields peaking around 30% by 5 -8 eV. Further increases in specific energy deposition serve only to increase O 2 dissociation and gas heating, thereby reducing the O 2 ͑ 1 ⌬͒ yield. We also found that variations in peak yields at a given specific energy deposition are caused by secondary effects resulting from dilution, pressure, and power level. We show that these secondary effects alter the O 2 ͑ 1 ⌬͒ yield by shifting the O 2 ͑ 1 ⌺͒ /O 2 ͑ 1 ⌬͒ ratio.

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Section: Scaling Of O 2 "mentioning

confidence: 99%

Section: Scaling Of O 2 "mentioning

confidence: 99%

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O 2 ( Δ 1 ) production in He∕O2 mixtures in flowing low pressure plasmas

Stafford

Kushner

2004

Journal of Applied Physics

272

200

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“…For a Fabry-Perot resonator and based on the constant-gain approximation, 7,10,12 g is equal to the threshold gain and is a constant in the streamwise direction x. In the case of low gas pressure, i.e., inhomogeneous broadening, it is deduced from Eqs.…”

Section: Calculation Of Output Power and Extraction Efficiencymentioning

confidence: 99%

“…For the Fabry-Perot resonator, with the assumptions that the gain is equal to the loss in the laser cavity and the distributed loss and aperture loss are independent upon the distance x in the streamwise direction ͑the so-called constant gain approximation͒, 7,10,12 it can be deduced that g ϭ g th , dg th dx ϭ 0.…”

Section: Gain Saturation Equation Of the Re Model In Flowing Coilmentioning

confidence: 99%

Performance Analyses of Flowing Chemical Oxygen-Iodine Laser

Zhi

2003

Appl. Opt.

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A modified simplified rate-equation model that utilizes the Voigt profile function and another gain saturation model deduced from the kinetic equations are presented for performance analyses of a flowing chemical oxygen-iodine laser. Both models are adapted to both the condition of homogeneous broadening and that of inhomogeneous broadening being of importance and the condition of inhomogeneous broadening being predominant. Effects of temperature and iodine density on the output power and on variations of output power, optical intensity, and saturation intensity with flow distance are presented as well. There are differences between results of two models, but both qualitatively agree with known results.

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3.7 Iodine lasers

Rohlena

Beránek

Laser Systems, Part 1

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Experiment and modeling of a small-scale, supersonic chemical oxygen-iodine laser

Cited by 20 publications

References 21 publications

O 2 ( Δ 1 ) production in He∕O2 mixtures in flowing low pressure plasmas

O 2 ( Δ 1 ) production in He∕O2 mixtures in flowing low pressure plasmas

Performance Analyses of Flowing Chemical Oxygen-Iodine Laser

3.7 Iodine lasers

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