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High average output powers from passively mode-locked lasers are desirable for a number of applications, such as for example large-scale laser projection displays. Tens of watts of average power have usually been achieved only with amplified systems, containing a mode-locked oscillator and one or several amplifier stages. Recently we demonstrated the generation of 16 W of average power in 700-fs pulses directly from a passively mode-locked thin-disk Yb:YAG laser.1 This concept turns out to be power-scalable, and indeed we have now obtained as much as 60 VV average power from an improved laser based on the same principle. This is the highest average output power ever reported from a passively mode- locked laser (without using an amplifier).
© 2002 Optical Society of America
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