Titanium-doped sapphire (Ti:Al2O3) is a gain medium with a very broad emission bandwidth allowing the generation and amplification of very short pulses (≪100 fs) . However, it is mainly used in rod laser architectures limiting its use to moderate average power. On the contrary, the thin-disk laser concept has proven to offer both power and energy scalability to a wide extent. Due to the relatively small gain product of Ti:sapphire compared to Yb-doped gain materials, especially Yb:YAG, and the temperature-dependent large fractional heating the task of building an efficient Ti:sapphire thin-disk laser oscillator is very challenging.
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