Abstract
We theoretically analyzed the thermal effects in a diode-pumped Kerr-lens mode-locked Yb:CGA oscillator. The calculation of temperature distribution in the Yb:CGA crystal was performed with finite element simulations. The thermal lens focal length in the crystal was calculated at different pump power levels. Using an additional fused silica as the Kerr medium, we demonstrated a high-power diode-pumped femtosecond Yb:CGA oscillator. The laser delivered 95 fs pulse duration with an average power of 7.5 W at the repetition rate of 65 MHz, which corresponding to 115 nJ of the pulse energy and 1.21 MW of the peak power. With the method of separation of the gain material and Kerr medium, the output power can be scalable to multi-Watts while the pulses duration is maintained at sub-100 fs level.
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