Supersonic COIL with iodine injection in transonic and supersonic sections of the nozzle

S. Rosenwaks, E. Bruins, D. Furman, V. Rybalkin, B. D. Barmashenko

Research output: Contribution to journalConference articlepeer-review

6 Scopus citations


We report on a detailed experimental study of the gain and temperature in the cavity of a supersonic chemical oxygen-iodine laser operating without primary buffer gas and on preliminary power measurements in this laser. In particular, a study is carried out to find optimal values of the flow parameters corresponding to the maximum gain. The measurements are performed for slit nozzles with different numbers and positions of iodine injection holes. Using a diode laser based diagnostic, the gain and temperature in the cavity are studied. Maximum gain of 0.73%/cm is obtained at chlorine and secondary nitrogen flow rates of 15 mmole/s and 7 mmole/s, respectively, for a slit nozzle with transonic injection of iodine. Preliminary power measurements are performed. For slit nozzle with iodine injection in the diverging part of the nozzle output power of 287 W with chemical efficiency of 21% was measured at 15.1 mmole/s of Cl2 with no primary buffer gas. This is the highest reported chemical efficiency of a supersonic COIL operating without primary buffer gas.

Original languageEnglish
Pages (from-to)19-22
Number of pages4
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - 1 Jan 2001
EventXIII International Symposium on Gas Flow and Chemical Lasers - Florence, Italy
Duration: 18 Sep 200022 Sep 2000


  • Chemical lasers
  • Iodine
  • Oxygen
  • Power lasers

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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