High stability gas discharge tube for high power laser emission

摘要

1. Gas discharge tube with high current density for laser emission at very high emission stability including an ionisation chamber (1) formed by a tubular element provided with a central circular opening, comprising - a heat exchanger (2) including cooling fins (161, 162, 16p) arranged on the external wall of the ionisation chamber (1), - an internal envelope (3) surrounding said cooling fins (161, 162, 16p) and enabling in operation, the circulation of a heat transporting fluid between said internal envelope (3) and the external wall of the ionisation chamber (1), - a gas recirculation circuit (4) including a plurality of basic recirculation circuits (41, 42, 4p) each exhibiting a resistance to gas flow greater than that of the ionisation chamber (1), - an anode (5) with high current density stability permitting transmission of the laser beam, characterized in that - the tubular element forming the ionisation chamber (1) is formed by a joined stacking of concentric metallic elements (15) each comprising a circular central opening (150) and a plurality of radial projections (151, 152, 15p) forming said fins, and in that - the basic recirculation circuits (41, 42, 4p) are arranged at the exterior of the internal envelope (3).