We report direct generation of $81\mathrm{nJ}$ chirped pulses from a room-temperature, Kerr lens mode-locked ${\mathrm{Cr}}^{4+}$ :forsterite oscillator operating at $1258\mathrm{nm}$ . To increase the pulse energy, the pulse repetition rate of the short x-type resonator was lowered from 143 to $4.9\mathrm{MHz}$ by the addition of a q-preserving multipass cavity, which provided an additional effective optical path length of $59.4\mathrm{m}$ . The duration of the chirped pulses was around $5.5\mathrm{ps}$ with a spectral width of $21\mathrm{nm}$ . The pulses were externally compressed to $607\mathrm{fs}$ by using a diffraction grating pair. To our knowledge, this is the highest reported pulse energy directly generated from a room-temperature mode-locked ${\mathrm{Cr}}^{4+}$ :forsterite laser.

© 2011 Optical Society of America

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