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Spectroscopic properties of heavily Ho3+ -doped barium yttrium fluoride crystals * Ji En-Cai(吉恩才) a) , Liu Qiang(柳 强) a) † , Nie Ming-Ming(聂明明) a) , Luo Hui (罗 辉) b) , Hu Yu-Xi(胡玉熙) b) , Guan Zhou-Guo(官周国) b) , and Gong Ma-Li(巩马理) a) a) State

We first demonstrate the laser performance of a Cr:CdSe passively Q-switched (PQS) 2.09 μm Ho: YAG laser resonantly pumped by a thulium-doped fiber laser. The maximum output pulse energy of 1.766 mJ, corresponding to a repetition frequency of 685 Hz, was obtained with a pulse duration of 15.4 ns. The pulse peak power was 114.7 kW, while the PQS efficiency was 21.45% against the continuous-wave output. The laser wavelength in the PQS operation was precisely measured to be 2090.2 nm.