A compact CW supersonic chemical oxygen iodine laser

Phipps, Steven P.; Helms, Charles A.; Truesdell, Keith A.; Healey, Keith P.

doi:10.2514/6.1994-2453

Cited by 8 publications

(5 citation statements)

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“…As a first step on the present stage, we needed confirmation in lasing experiments the TA SOG performance obtained earlier in measurements of SO concentration and making sure of sufficient effectiveness of the mixing system we used. Therefore, our experiments were performed with SO pressure at the nozzle inlet of 20 to 30 Ton as it was in the early papers, reported on the highest COIL efficiency attained so far [9,10,15]. Fig.…”

Section: Mixing Systemmentioning

confidence: 97%

Supersonic oxygen-iodine laser evolution at Russian Federal Nuclear Center-VNIIEF

Vyskubenko¹,

Adamenkov²,

Deryugin³

et al. 2001

SPIE Proceedings

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The results of experimental and numerical-theoreticalsupersonic COIL study carried out at RFNC-VNIIEF in 1998 are performed. The novel data concern our research into the twisted-flow SOG (TA SOG) performance. The experimental investigations of gas-dynamic and energy performance, chemical efficiency, and optical quality are reported and discussed for the supersonic COIL with the parallel-flow system of gaseous iodine and singlet oxygen mixing. Application of TA-SOG together with the parallel-flow mixing system was shown to allow high values of COIL operation. The peculiarities of numerical-theoretical model developed at RFNC-VNIIEF are discussed. INTRODUCTIONIndustrial applications of the Oxygen -Iodine Laser (COIL) have been under active consideration in the last 5-7 years [1][2][3][4]. The interest in development of industrial COIL is stipulated by a number of its advantageous peculiarities such as: first, high emission power at good beam quality; second, possibility for powerful emission of COIL to reach remote workplaces via virtually loss-less fiber-silica beam delivery, which opens new technological areas of application. Due to the purely chemical pumping method, an independent powerful industrial laser facility wouldn't have too high demand in electric energy. Together with other unique features, all the above properties give COIL a definite priority over other industrial lasers, especially in such applications as dismantling of outserved nuclear plants or accident response operations [3][4][5]. COIL development for industrial purposes faces a set of difficulties, the most serious of them being as follows: i) keeping of the working vacuum inside the laser cavity; ii) safety and ecological problems related to the presence of chlorine, iodine, and corrosive solutions; iii) effective procedures of hydrogen peroxide alkali solution (BlIP) preparation and re-circulation. These and other problems refer to the tasks that will be solved in the course of industrial COIL development in VNIIEF. The principal problem at which the developers are currently focusing their efforts is pressure recovery at the exit COIL duct. The highest singlet oxygen pressure that may ensure high laser efficiency is supposed to be determined experimentally. Increasing the singlet oxygen pressure one can obtain higher output power with the same size of a facility; and increase in

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Section: Mixing Systemmentioning

confidence: 97%

Supersonic oxygen-iodine laser evolution at Russian Federal Nuclear Center-VNIIEF

Vyskubenko¹,

Adamenkov²,

Deryugin³

et al. 2001

SPIE Proceedings

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“…3 Fujii et al [4][5][6] at Kawasaki Heavy Industries, Ltd., in Japan demonstrated the operation of a COIL for long durations with the operation of a 1 kW subsonic gas flow COIL for 2 h. At the Phillips Laboratory, sustained high-power operation of a supersonic COIL was demonstrated with operation at 9 kW for 2 min 7 and at 430 W for 13 min on a compact COIL test stand. 8 Further details on COIL development and on the theoretical operation of COIL can be found Truesdell et al 2 and Avizonis and Truesdell, 9 respectively. Fujioka 10 reviewed the transmission of a COIL beam through optical fibers in 1991 to examine the industrial applications of such beam delivery systems.…”

Section: A Coil Developmentmentioning

confidence: 99%

Effects of mode structure on three-dimensional laser heating due to single or multiple rectangular laser beams

Kantor

Scott²,

Latham³

1996

Journal of Applied Physics

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The natural shape of a typical chemical oxygen-iodine laser ͑COIL͒ beam is rectangular which means that the transverse cross section of the beam is rectangular. Such a rectangular beam can be split into two or more beams to carry out materials processing. The distance between such beams and the mode structure in the beams can affect the distribution of heat in the workpiece. This, in turn, affects the quality and efficiency of materials processing. A three-dimensional quasi-steady-state thermal model is presented in this article, and an expression for the temperature distribution during laser heating with single or multiple COIL beams having rectangular spots is obtained. Calculations are carried out for single or two rectangular COIL beams. The depth of heating is found to increase when the distance between two beams is less than a certain value.

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“…Meanwhile, research towards making COIL an industrial device began in the latter half of the 1980's [9]. Long duration, high power industrial COIL operation was addressed in several papers [10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

<title>Cutting performance of a chemical oxygen-iodine laser on aerospace and industrial materials</title>

et al. 2000

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A chemical oxygen-iodine laser (COIL) was used for cutting aluminum, titanium,inconel and copper plates. The laser was operated with a stable resonator having an intracavity aperture to produce a circular COIL beam with very few transverse modes. The multimode focal spot diameter was calculated to be 0.24 mm. The new aluminum cut was of particularly high kerf edge quality. These COIL cutting data are compared with an existing theoretical laser cutting model. Using thermophysical data for aluminum, titanium, inconel and copper, this theory agrees very well with the data. To test the versatility ofthe model, the effects of different assumptions are examined; different assumptions produced very little effect on model predictions at high cutting speeds and a small difference at very slow cutting speeds. Overall, the theoretical model provides good agreement with experiments for a wide variety of metals.

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A compact CW supersonic chemical oxygen iodine laser

Cited by 8 publications

References 0 publications

Supersonic oxygen-iodine laser evolution at Russian Federal Nuclear Center-VNIIEF

Supersonic oxygen-iodine laser evolution at Russian Federal Nuclear Center-VNIIEF

Effects of mode structure on three-dimensional laser heating due to single or multiple rectangular laser beams

<title>Cutting performance of a chemical oxygen-iodine laser on aerospace and industrial materials</title>

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