We report continuous-wave (cw), quasi-cw and Q-switched laser oscillation of Yb3+,Tm3+-doped YLiF4 at 1.5 and 2.3 μm. Maximum cw output powers of 300 mW at 1.5 μm and 450 mW at 2.3 μm have been obtained. Quasi-cw excitation revealed 20 mJ pulses at 1.5 μm. The cw pumped 1.5 μm laser was passively Q-switched using a U:CaF2 crystal as saturable absorber with a repetition rate of 65 kHz and a pulsewidth of 800 ns. An average output power of 19 mW was achieved. The dynamics of the system was simulated using a rate equation model.
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Diening et al. (1998) studied this question.
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