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Study of the chemical hf laser pumped by phototriggered discharge

The non-chain reaction HF laser energized by an x-ray photo- triggered discharge has been studied for Ne/SF6/C2H6 and Ne/SF6H2 gas mixtures. For an active volume of 312 cm3, a high specific output laser energy of 10 J/l has been reached with an electric efficiency of 4.7% for the mixture with ethane, whereas only 6 J/l is obtained with an efficiency of 3.1% for the mixture with hydrogen. The study of the discharge development shows that the total production of HF molecules weakly depends on the gas mixture type, so that the plasma kinetic is not responsible for the difference observed between the laser performances obtained with the two mixtures. Time and spatially resolved measurements of the plasma fluorescence shows that discharge instabilities occur in the Ne/SF6 discharge, which are responsible for the HF laser emission disruption when hydrogen is added. But addition of ethane at about 3% of the total pressure induces the discharge stabilization, and allows the laser emission to occur in an homogeneous medium. As a result, this work clearly establishes the physical reason of the observed laser performance improvement when hydrogen is replaced by some hydrocarbons in discharge pumped HF laser.