We demonstrate a passively mode-locked femtosecond thin-disk laser oscillator. Chirped-pulse operation in the positive dispersion regime as well as solitary operation have been realized, and the laser performance of both configurations are compared. In the solitary mode-locking regime the output power exceeds in a diffraction-limited beam, and pulse durations as short as at a repetition rate have been generated. For the first time we present a chirped-pulse operation of a thin-disk oscillator that yields a maximum average output power of with a Fourier limit of .
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