Modeling of the gain and power in chemical oxygen-iodine lasers (COILs) and comparison with experimental studies are reported. The effect of mixing on the operation of the COIL is studied theoretically applying a simple one-dimensional leak flow tube model. Both the fraction of the dissociated iodine and the maximum gain are shown to be nonmonotonous functions of the iodine flow rate (nl2). There is an optimal value of nl2, depending on the (O2(1Δ)) yield, the gas velocity and the temperature in the cavity, for which the gain achieves its maximum and the iodine dissociation length its minimum. The model shows that the maximum nl2for which lasing is possible is less than 5% of the oxygen flowrate. This result is in agreement with experimental data and can not be explained by models based on the assumption of a premixed flow. Simple analytic expressions are derived for the optimal nl2the characteristic length of iodine dissociation, the gain and the lasing power. The calculated gain and power are compared with available experimental results for a small scale supersonic COIL developed in our laboratory. The power is studied as a function of the molar flow rates of the various reagents. Good agreement is found between the experimental results and calculations.
|State||Published - 1 Jan 1994|
|Event||AIAA 25th Plasmadynamics and Lasers Conference, 1994 - Colorado Springs, United States|
Duration: 20 Jun 1994 → 23 Jun 1994
|Conference||AIAA 25th Plasmadynamics and Lasers Conference, 1994|
|Period||20/06/94 → 23/06/94|