Tunable single-longitudinal-mode Er:YAG laser using a twisted-mode technique at 1.6 mu m

摘要

We demonstrated a diode-pumped tunable single-longitudinal-mode Er: YAG laser using a twisted-mode technique at 1.6 mu m. The maximum single-longitudinal-mode output power of 315 mW was obtained at 1645.3 nm, corresponding to a slope efficiency of 7.7%. The single-longitudinal-mode laser has a beam quality factor of M2 similar to 1.07. The output wavelength can be tuned from 1644.8 to 1646.1 nm by changing the etalon angle. In addition, by changing an output coupler, a maximum single-longitudinal-mode output power of 130 mW at 1617.2 nm with a slope efficiency of 3.3% was also achieved. The output wavelength can be tuned from 1616.9 to 1617.4 nm by changing the etalon angle. The twisted-mode Er:YAG laser operated at single-longitudinal mode is being reported for the first time to the best of our knowledge.