Using by different output transmittances of 2percent, 5percent, and 10percent, we have investigated the continuously tunable laser performance of c-cut Tm:YAP crystal. The 5-mm long c-cut crystal with 4 at.percent thulium ion was used. Without a tuning element, the slope efficiency respect to the absorbed pump power reached 44.1percent with transmittance of 5percent, corresponding to the conversion efficiency of 35.3percent. The laser operated at TEM_(00) mode with a beam quality factor of M~(2) approx 1.3, which was demonstrated by a 90/10 knife-edge method. A 3-mm thick birefringent plate was used as a tuning element. At transmittance of 5percent, the widest tunable range of 159 nm extended from 1899 to 2058 nm. For transmittances of 2percent and 10percent, the tunable ranges of 150 and 68 nm were achieved, respectively.
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