Abstract:A c cut Tm:YAP laser which operated at 1.94 or 1.99 µm is reported in detail. The maximum out put power was 20.4 and 19.8 W at the wavelength around 1.99 and 1.94 µm, corresponding to the slope effi ciency of 34.3 and 31.5%, respectively. For 1.94 µm operation, with an F-P etalon inserted in the cavity, the output central wavelength was stable around 1.94 µm with about 0.15 nm linewidth. The beam quality factor M 2 was measured to be ~1.8 for 1.99 µm and ~1.9 for 1.94 µm.
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