Fig. 1. Schematic of the passively mode-locked picosecond oscillator extended with a q-preserving MPC. The insets show spot patterns on the MPC mirrors.

Fig. 2. Output performance of three different operation regimes.

Fig. 3. Oscilloscope trace of the pulse train at a repetition rate of 7.7 MHz.

Fig. 4. Radio frequency spectrum of the oscillator (a) at the fundamental beat note with a resolution bandwidth of 1 kHz, and (b) at the 100 MHz wide span range with a resolution bandwidth of 100 kHz.

Fig. 5. Measured autocorrelation trace, assuming a Gaussian-shaped pulse; inset shows the optical spectrum of the output pulses.

Fig. 6. Beam quality and far-field beam profile.

Fig. 7. Power stability of the oscillator output at full pump power.