Comparative characteristics of subsonic and supersonic oxygen—iodine lasers

Загидуллин, М. В.; Николаев, В. Д.; Svistun, M I; Khvatov, N A

doi:10.1070/qe1998v028n05abeh001235

Cited by 6 publications

(4 citation statements)

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“…These results are in close agreement with the analytical results obtained and also with that reported by Zagidullin et al [3]. The cavity Mach number was found to drop marginally in the case of hot runs to 2.5 for a measured cavity pressure of approximately 10 Torr and stagnation pressure of approximately 85 Torr, which is higher compared to that in the cold runs, possibly due to the heat release and the accompanying boundary layer effects.…”

Section: Discussionsupporting

confidence: 95%

“…SCOIL systems are mostly operated in supersonic regimes [3] as compared to their subsonic counterparts due to the existence of some inherent advantages in its operation-high gain on account of low temperature due to high Mach number, decreased sensitivity of laser output to the iodine flow rates and better power scalability potential. In a supersonic SCOIL, the cavity temperature (T) and the cavity Mach number (M) are related as [4] …”

Section: Introductionmentioning

confidence: 99%

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Realization of an advanced nozzle concept for compact chemical oxygen iodine laser

Singhal

Subbarao

Rajesh

et al. 2007

Optics & Laser Technology

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Section: Discussionsupporting

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Realization of an advanced nozzle concept for compact chemical oxygen iodine laser

Singhal

Subbarao

Rajesh

et al. 2007

Optics & Laser Technology

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“…This method is described in [9]. The experimental set-up is similar to that described in [10] and is presented in fig.1.…”

Section: Methodsmentioning

confidence: 99%

Study of the Process of Mixing, Temperature, and Small Signal Gain in the Active Medium of Supersonic COIL With Advanced Nozzle Bank and DC Discharge Method of O2(1 Delta) Production in a Vortex Tube

Николаев¹

2001

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Public reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing the burden, to Department of Defense, Washington Headquarters Services, Directorate for Information TITLE AND SUBTITLEThe study of the mixing process, gas temperature, and small signal gain in the active medium of supersonic COIL with advanced nozzle bank and DC discharge method of production of O2 singlet delta in the vortex tube SPONSOR/MONITOR'S ACRONYM(S) 9. SPONSORING/MONITORING AGENCY NAME(S) AND ADDRESS(ES)EOARD PSC 802 BOX 14 FPO 09499-0014 SPONSOR/MONITOR'S REPORT NUMBER(S)ISTC 00-7016 DISTRIBUTION/AVAILABILITY STATEMENTApproved for public release; distribution is unlimited. SUPPLEMENTARY NOTES ABSTRACTThis report results from a contract tasking P. N. Lebedev Physical Institute, as follows:The objective of this project is to develop the optimal ejector nozzle bank for chemical oxygen iodine laser and to diagnose the gain and gasdynamic characteristics of the laser active medium employing the usual standard methods, laser induced fluorescence (LIF) and tunable one-mode semiconductor probe laser. The objective of this project is to develop the optimal ejector nozzle bank for chemical oxygen iodine laser and to diagnose the gain and gasdynamic characteristics of the laser active medium employing the usual standard methods, laser induced fluorescence (LIF) and tunable one-mode semiconductor probe laser. Several ejector nozzle bank designs have been developed, manufactured and tested. The mixing efficiencies of the gas jets, small signal gain distributions and Pitot pressure distributions have been comprised for these nozzle banks. The maximal COIL chemical efficiency has reached in the direct lasing experiments equal to 25%. The one-dimensional gasdynamic simulation has been developed for calculation of completely mixed gas stream parameters downstream of the ejector nozzle banks. The temperature dependence of pressure broadening of the atomic iodine line 2 ? 1/2 -2 ? 3/2 in the range T=220°? ÷340°? has been measured. The other objective to investigate of the vortex-stabilized discharge characteristics in pure oxygen and singlet delta oxygen content in the downstream afterglow region for power load up to 3 kJ/g, measurement of iodine atoms concentration when methyl iodide is mixed into the discharge or downstream afterglow regions. SUBJECT TERMS

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“…Also, in supersonic operation the power output is not critically dependent on iodine flow rates [3] as compared to the subsonic case, in which the output power is optimum only in a very narrow range of iodine concentration. Moreover, the small signal gain (a) inside the cavity is inversely proportional to the temperature of the flow medium in the cavity [4].…”

Section: Introductionmentioning

confidence: 94%