High-pressure pulsed COIL assisted with an instantaneous production of atomic iodine II

Pulsed oscillation of chemical oxygen-iodine laser, which is comprised of a pulsed singlet oxygen generator (SOG) and a photolytic iodine laser, is studied. This scheme allows one to produce a large aperture and high-pressure laser medium while maintaining a minimum degradation of stored energy by water vapor. The experimental apparatus consists of a porous pipe SOG, an iodine donor (CH3I) injector, a flash lamp and an optical resonator. Laser oscillation experiments are conducted and the operational characteristics of the apparatus are investigated. Pulse duration is inversely proportional to the iodine donor concentration as expected. The oscillation capability for different iodine donors is studied and it is concluded that the iodine donors containing fluorine are not suitable for the proposed scheme. Unfavorable chemical dissociation of iodate, which was observed in the previous study, is avoided by the optimization of the iodine donor injection and flash exposure timings. Maximum output energy of 730mJ with pulse duration of 65μm is obtained.