We report on a Kerr-lens mode-locked Yb:CALGO (Yb:CaGdAlO4) oscillator providing 50 fs pulses at 59.4 MHz repetition with an output power of 8.6 W that is pumped by a diode laser coupled to a multimode fiber. The mode-locking was initiated near the cavity stability edge of the CW mode, where the Kerr lensing at the gain crystal in the pulse mode reduces the cavity loss of the spatial mode and suppresses the CW mode build-up. The obtained pulse energy of 0.15 μJ and peak power of 2.5 MW from a simple laser cavity without saturable absorber, pumped by a conventional diode laser, are competitive in comparison to other Yb-doped bulk oscillators. An overview of previously demonstrated mode-locked oscillators reveals that the Yb:CALGO oscillator employing Kerr-lens mode-locking is a promising candidate to achieve ultrashort high-power pulses near 1040 nm.
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