Abstract
Continuing experiments with Electric Oxygen-Iodine Laser (ElectricOIL) technology have significantly increased laser power output by increasing the product of gain and gain-length, g<sub>0</sub>L. The authors report on progress with recent ElectricOIL devices utilizing a new concentric discharge geometry with improved O<sub>2</sub>(a<sup>1</sup>▵) production at higher discharge operating pressure at higher system flow rates. O<sub>2</sub>(a<sup>1</sup>▵) produced in flowing radio-frequency discharge in O2- He-NO gas mixture is used to pump I(2P1/2) by near-resonant energy transfer, and laser power is extracted on the I(<sup>2</sup>P<sub>1/2</sub>) → I(<sup>2</sup>P<sub>3/2</sub>) transition at 1315 nm. Modeling of recent data is presented. By increasing the gain length (system size) by a factor of 3, a 5-fold increase in laser output on the 1315-nm transition of atomic iodine was achieved. Flow conditions with g<sub>0</sub>L = 0.042 were used to extract a continuous wave (CW) average total laser power of 481 W. A low frequency ±11.9% oscillation in the total power was observed giving a peak outcoupled power of 538 W.
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