Foil cooling system for high current density electron-beam pumped lasers

摘要

A laser of the type in which laser gas molecules are pumped by an electron beam has a gas-cooled window forming the interface between the electron beam source and the laser gas. The window includes a metallic foil mounted on a supporting frame with a parallel thin layer of material transparent to the electron beam positioned between the foil and the electron beam source. Helium or other cooling fluid is circulated in the space between the foil and the intermediate layer for conducting heat away from the foil. The helium may be at an intermediate pressure less than the pressure of the laser gas on one side of the foil but greater than the vacuum of the electron beam source to reduce foil stresses.