Abstract

The multiple radiation environment of future high-current free-electron laser (FEL) oscillators will pose severe requirements on the resonator mirrors. In addition to withstanding the high-average power, high-repetition-rate pulses of the fundamental laser radiation, the optical properties of the mirrors must not be degraded by the attendant optical harmonics, gamma rays, neutrons, electrons, and vacuum. Furthermore, the initial mirror absorption must be low enough so that the reflected wavefront distortion is tolerable when various types of mirror cooling are employed.

© 1987 Optical Society of America