The Main Amplifier operates in a double-pass configuration with five flashlamp-pumped Nd:glass amplifier modules. Its design originates from the formet Nova and Phebus laser amplifier systems. With a beam diameter of up to 28 cm, it can produce output energies reaching one kilojoule. For short pulses from the femtosecond frontend, the maximum achievable energy is 250 joules, limited by the Faraday isolator and the pulse compressor. The Faraday isolator is essential for suppressing potential back reflections from the experimental chamber.
