Abstract
We report on high-performance infrared lasers at 0.94μm based on quasi-three-level transition of F3/24→I9/24 in Nd:LuYAG mixed crystal, for the first time to our knowledge. The maximum output power was achieved to 5.64W with slope efficiency of approximately 52.5% at 946nm. The simultaneous dual-wavelength laser at 939 and 946nm is also obtained with maximum output power of 3.61W and slope efficiency of 34.8% by introducing a glass etalon into the cavity. Moreover, a 2.0-W single-wavelength laser at 939nm can be further attained by suitably tilting the etalon. Using a Cr:YAG saturable absorber, Q-switched laser operation is realized with maximum average output power of 0.68W and the narrowest pulse width of 8.4ns, which results in the maximum single pulse energy of approximately 55.3μJ and the maximum pulse peak power of approximately 6.15kW. Finally, thermal focal length of the laser crystal is estimated by using a flat-flat laser cavity.
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