Journal
OPTICS EXPRESS
Volume 16, Issue 9, Pages 6397-6407Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.16.006397
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We report on a passively mode-locked Yb:YAG thin disk laser oscillator that generates 11.3-mu J pulses without the use of any additional external amplification. A repetition rate of 4 MHz is obtained using a 23.4-m-long multiple-pass cavity that extends the resonator length to a total of 37 m. The nearly transform-limited pulses at 45 W of average output power have a duration of 791 fs with a 1.56-nm-broad spectrum centered at 1030 nm. The laser is operated in a helium atmosphere to eliminate the air nonlinearity inside the resonator that previously limited the pulse energy. (c) 2008 Optical Society of America.
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