Abstract

We report direct generation of 81nJ chirped pulses from a room-temperature, Kerr lens mode-locked Cr4+:forsterite oscillator operating at 1258nm. To increase the pulse energy, the pulse repetition rate of the short x-type resonator was lowered from 143 to 4.9MHz by the addition of a q-preserving multipass cavity, which provided an additional effective optical path length of 59.4m. The duration of the chirped pulses was around 5.5ps with a spectral width of 21nm. The pulses were externally compressed to 607fs by using a diffraction grating pair. To our knowledge, this is the highest reported pulse energy directly generated from a room-temperature mode-locked Cr4+:forsterite laser.

© 2011 Optical Society of America

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