Abstract
We demonstrate a 2.5 m ring laser with the Ho:YAG and Ho:YLF crystals end-pumped by the Tmdoped fiber laser. In the Ho:YAG laser, the continuous-wave (CW) output power was 4.72 W at a wavelength of 2090.8 nm when the incident pump power was 21.5 W, which corresponded to a slope efficiency of 26.3%. For the Q-switched operation with the 100 Hz pulse repetition frequency (PRF), an output energy of 5.16 mJ and a pulse width of 125.6 ns were achieved at a pump power of 9.53 W. In the Ho:YLF laser, up to a 4.14 CW output power was realized under an incident pump power of 22.3 W, which corresponded to a slope efficiency of 27.3%. At the 100 Hz Q-switched operation, the output energy was 4 mJ and the corresponding pulse width was 165.4 ns, when the pump power was 9.86 W.
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