Experimental study of a small scale COIL using a jet type generator of singlet oxygen

Salman Rosenwaks, I. Blayvas, Boris D. Barmashenko, Dov Furman, Marsel V. Zagidullin

Research output: Contribution to journalConference articlepeer-review


We report on studies of a 5 cm gain length chemical oxygen- iodine laser (COIL) energized by a jet-type singlet oxygen generator (JSOG) are presented. For 10 mmole/s of Cl2 flow rate, output power of 132 W with chemical efficiency of 14.5% were obtained without a water vapor trap. One-hundred-sixty- three watts and 18% were achieved when cooled (173 K) He was introduced downstream of the JSOG; under these conditions the small signal gain was estimated to be 0.32% cm-1. Wattage of 190 and 10.5% were obtained for 20 mmole/s of Cl2 flow rate. Replacing He by N2 as a buffer gas resulted in a 13% power decrease only. The main key for increasing the chemical efficiency of a COIL without a water vapor trap for a given iodine-oxygen mixing system is found to be high oxygen pressure and low water vapor pressure inside the reaction zone of the JSOG. The last goal was achieved by optimizing the composition and temperature of the basic hydrogen peroxide solution (BHP). The experimental results are discussed and related to the composition and flow conditions of the gaseous reactants and of the BHP. We also report on preliminary results of efficient COIL operation without primary buffer gas using rectangular nozzles with iodine injection in the throat.

Original languageEnglish
Pages (from-to)690-693
Number of pages4
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - 1 Dec 1997
EventXI International Symposium on Gas Flow and Chemical Lasers and High-Power Laser Conference - Edinburgh, United Kingdom
Duration: 25 Aug 199625 Aug 1996


  • Chemical oxygen-iodine lasers
  • Supersonic COILs

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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