A confocal, reflection-double-pass, Ti:sapphire continuous-wave (cw) 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 with a slightly saturated gain of 3.7 through an amplifier pumped by three cw green lasers, and the extraction efficiency reaches 10.6%.

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