Experimental and Theoretical Investigation of Laser Medium in a Grid-Nozzle Multi-Kw Supersonic Chemical Oxygen Iodine Laser

概要

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Laser medium parameters of a multi-kW grid-nozzle supersonic Chemical Oxygen Iodine Laser (COIL) were studied both experimentally and theoretically. Small signal gain (SSG) diagnostics were performed using a narrow line-width tunable laser by scanning a 1 GHz range around the (2P1/2)–(2P3/2) spin-orbit transition line of atomic iodine. Numerical simulation was employed to obtain the gain distribution along the optical axis, yield of singlet oxygen, iodine dissociation fraction and the temperature inside the laser cavity. Almost all the input parameters for the simulation were taken from the experimental data. The bulk of the singlet oxygen is found to be deactivated by the iodine jet, while the yield at the Nozzle Exit Plane (NEP) is found to be half of that in the subsonic area. Simulation also showed that 90% of molecular iodine is dissociated at the nozzle throat. Gain along the optical axis appeared to be non-uniform, and included absorption regions. The experimentally measured maximum gain value was found to be 0.26 m-1.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2004-09-15