High-energy self-starting femtosecond Cr:forsterite oscillator operating at low-repetition rate

We report a diode pumped 2 micrometers Tm:YAG laser operating in a pulsed mode, with an RTP Pockels cell as the Q-switch generator. A maximum output of 2.4 mJ with a pulse width of 57ns was achieved. The crystal was pumped with an input energy of 85mJ at a rate of 20Hz. To the best of our knowledge, this is the first time that RTP was used as the Q-switch generator in a 2 micrometers laser resonator.

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