Low Pressure Helium Cooled Active Mirror Amplifiers for HiPER KiloJoule Beamlines

抄録

The European laser driven fusion project HiPER relies on kilojoule, nanosecond pulse trains with repetition rates close to 10 hertz and high wall-plug efficiency. We propose a scheme based on diode-pumped amplifiers using Yb³⁺:YAG ceramics as gain medium. An active mirror architecture where the high reflection coated side is cooled using a low pressure static Helium gas cell, is proposed.