Parametric study of small-signal gain in a slit nozzle, supersonic chemical oxygen-iodine laser operating without primary buffer gas

Furman, Dov; Bruins, E.; Rybalkin, V.; Barmashenko, Boris D.; Rosenwaks, Salman

doi:10.1109/3.903066

Cited by 18 publications

(6 citation statements)

References 16 publications

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“…5 and 3 shows that the gain decreases as the optical axis is moved downstream from the first position and the temperatures increase due to higher losses. This trend is also observed experimentally in 14 Figs. 6 and 7 show that there is a good agreement between the calculated and experimental results for smaller values of nCl 2 (runs 2 and 3, Table 1).…”

Section: Comparison Of Calculated and Experimental Resultssupporting

confidence: 75%

“…3 and 4 show calculated dependencies of g, Tm and F on nI, for Heidner's and Heaven's mechanisms of iodine dissociation, respectively, for run 1 (Table 1) with nCl 2 = 20 mmole/s and the first position of the optical axis located 5 cm downstream of the injection point. The same figures show experimental dependencies of g and T, on nI 2 obtained in 14 It should be mentioned that F is not measured during the experiment and therefore only the calculated results for F are presented. It is seen (Fig.…”

Section: Comparison Of Calculated and Experimental Resultsmentioning

confidence: 92%

“…The cross-sections of the primary flow in the subsonic part (5 cm 2 ) and of the secondary flow in the sonic part (0.2 cm 2 and 0.34 cm 2 for transonic injectors No. 1 and 2, respectively, described in detail in 14), are fixed parameters.…”

Section: Input Parameters Of the Modelmentioning

confidence: 99%

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Modeling of the gain, temperature, and iodine dissociation fraction in a supersonic chemical oxygen-iodine laser

Barmashenko

Bruins

Furman

et al. 2002

Gas and Chemical Lasers and Intense Beam Applications III

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We report on a simple one-dimensional model developed for the fluid dynamics and chemical kinetics in the chemical oxygen iodine laser (COIL). Two different 12 dissociation mechanisms are tested against the performance of a COIL device in our laboratory. The two dissociation mechanisms chosen are the celebrated mechanism of Heidner and the newly suggested mechanism of Heaven. The gain calculated using Heaven's dissociation mechanism is much lower than the measured one. Employing Heidner's mechanism, a surprisingly good agreement is obtained between the measured and calculated gain and temperature over a wide range of the flow parameters. Other predictions of the model (larger mixing efficiency and higher temperature with a leak opened downstream of the resonator and gain decrease along the flow) are also in agreement with the experimental observations.

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Section: Comparison Of Calculated and Experimental Resultssupporting

confidence: 75%

Section: Comparison Of Calculated and Experimental Resultsmentioning

confidence: 92%

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Modeling of the gain, temperature, and iodine dissociation fraction in a supersonic chemical oxygen-iodine laser

Barmashenko

Bruins

Furman

et al. 2002

Gas and Chemical Lasers and Intense Beam Applications III

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“…[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%

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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“…Recently, a new concept of COIL operating without primary buffer gas was proved to be of higher efficiency and stability, and more applicability for mobile integration. This kind of COIL uses nitrogen rather than helium as the buffer gas in the secondary flow (Furman, Barmashenko and Rosenwaks, 1998;Furman et al, 2001;Chen, 2002 &2003), which results in characteristic velocity reduction. A series of experimental studies were completed with a supersonic COIL at Ben-Gurion University (Furman, Barmashenko and Rosenwaks, 1998;Furman et al, 2001;Bruins et al, 2002;Rybalkin et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of the Flowfield in a Supersonic Coil with an Interleaved Jet Configuration and its Effect on the Gain Distribution

胡宗民

et al. 2007

Engineering Applications of Computational Fluid Mechanics

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ABSTRACT:In a supersonic chemical oxygen-iodine laser (COIL) operating without primary buffer gas, the features of flowfield have significant effects on the Laser efficiency and beam quality. In this paper three-dimensional, multispecies, chemically reactive CFD technology was used to study the flowfield in mixing nozzle implemented with a supersonic interleaving jet configuration. The features of the flowfield as well as its effect on the spatial distribution of small signal gain were analyzed.

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Parametric study of small-signal gain in a slit nozzle, supersonic chemical oxygen-iodine laser operating without primary buffer gas

Cited by 18 publications

References 16 publications

Modeling of the gain, temperature, and iodine dissociation fraction in a supersonic chemical oxygen-iodine laser

Modeling of the gain, temperature, and iodine dissociation fraction in a supersonic chemical oxygen-iodine laser

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

Numerical Analysis of the Flowfield in a Supersonic Coil with an Interleaved Jet Configuration and its Effect on the Gain Distribution

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