Diode-laser-based absorption spectroscopy diagnostics of a jet-type O-2((1)Delta) generator for chemical oxygen-iodine lasers

Using diode-laser-based diagnostics, O-2((1)Delta) yield and water vapor fr action were measured at the exit of a jet-type singlet oxygen generator (JS OG) for a chemical oxygen-iodine laser (COIL), Chlorine utilization and gas temperature at the generator exit were also measured, simultaneously. For conditions corresponding to the maximum chemical efficiency of the superson ic COIL energized by the JSOG, the O-2((1)Delta) yield, water vapor fractio n, chlorine utilization, and temperature at the generator exit are 0.65, 0. 08 and 0.92, and 30 degrees C, respectively, Increase of the basic hydrogen peroxide temperature results in an increase of the water vapor fraction ca used by an increase of the saturated water vapor pressure in the generator. As the pressure in the generator rises from 18 to 60 torr, the yield decre ases from 0.65 to 0.48, Dependence of the yield on the generator pressure i s consistent with a rate constant for the O-2((1)Delta) energy pooling reac tion of 2.7 x 10(-17) cm(3). s(-1). The same rate constant explains the mea sured variation of the temperature along the flow in the diagnostic cell.