Pulsed COIL with volume generation of iodine atoms in electric discharge

Abstract

The method of volume generation of iodine atoms to obtain the pulsed mode of COIL is the most effective by the ratio of pulsed power to cw one at the same flowrate of chemicals. The electric discharge is a very convenient tool to produce iodine atoms in an active medium. The electrical efficiency close to 100% was obtained when longitudinal glow discharge was used. The investigation of both influence of the discharge gap length on the performance of pulsed COIL initiated with longitudinal discharge and transverse discharge initiated pulsed COIL based on the Jet Singlet Oxygen Generator were performed. The lasing of Jet SOG based pulsed COIL has been obtained for the first time. The operation pressure of 17 Torr at oxygen partial pressure of 7 Torr in the laser cavity has been obtained The temperature parameters of active medium being under electric discharge initiation were analyzed. The active medium temperature growth was shown to be responsible for decrease of specific output energy in discharge initiated COIL unlike that for photolytic initiation.

RF discharge generation of I atoms in CH 3 I and CF 3 I for COIL/DOIL

“…The operation of COIL or DOIL imposes the following main requirements on the atomic iodine generator: (1) a high yield of atomic iodine, (2) a low temperature, (3) a sufficiently high pressure to inject produced iodine into the laser cavity and (4) a low quenching rate of O 2 ( 1 ∆ g ) and I( 2 P 1/2 ) by reactants and reaction products. Two methods of atomic iodine for COIL/DOIL were investigated till now, a chemical way [2][3][4][5] and electric discharge way [6][7][8][9][10][11][12][13][14][15][16][17] (plasma-chemical way). *schmiedb@fzu.cz; phone +420-266052629; fax +420-286890265; www.fzu.cz The chemical way of atomic iodine generation for COIL was suggested and theoretically and experimentally tested in our laboratory.…”

“…[6][7][8][9][10][11][12][13][14][15][16][17] A lifetime of the COIL active medium is inversely proportional to a water vapor and I atom concentrations. The injection of atomic iodine into the laser cavity shortens, besides increasing the laser power, this active medium lifetime and thus it can result in shifting an optimum position of optical axis.…”