High-efficiency,high-energy performance of a pulsed HF laser pumped by phototriggered discharge |
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Authors: | V Puech P Prigent H Brunet |
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Institution: | (1) Laboratoire de Physique des Gaz et des Plasmas (associé au C.N.R.S.), Université Paris-Sud, F-91405 Orsay Cedex, France;(2) Laserdot (Groupe Aérospatiale), Route de Nozay, F-91460 Marcoussis, France |
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Abstract: | A comparison of the performance of pulsed infrared HF lasers pumped by phototriggered discharges using either Ne/SF6/H2 or Ne/SF6/C2H6 mixtures are presented. For an active volume of 50 cm3, a specific output energy as high as 11 J/ has been achieved with an efficiency higher than 3% when C2H6 is used as H atom fuel. The replacement of ethane by molecular hydrogen reduces the laser performance by 40%. The investigation of the temporal evolution of the laser intensity shows that this dramatic decrease results from a shortening of the laser pulse duration rather than from a decrease of the peak power. Indications are given that this behavior is correlated to a very different temporal evolution of the discharge parameters, especially at low reduced electric field E/N. |
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Keywords: | 42 55E 42 60B |
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