A confocal, reflection-double-pass, Ti:sapphire continuous-wave amplifier with a small- signal gain of 4.2 has been invented. Femtosecond pulses with an 82-MHz repetition rate from a mode-locked Ti:sapphire laser are amplified to 5.77-W average power through an amplifier pumped by three cw green lasers, and the extraction efficiency reaches 10.6 %.

© 2000 Optical Society of America

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