Abstract
In this work, we report a 1908nm Tm:YLF bulk laser pumped by the fiber coupled diode laser, the maximum output power of which was 70.8W at the incident pump power of 184.6W, corresponding to the optical-to-optical efficiency of 38.4% and slope efficiency of 43.7%. The laser wavelength was selected and restricted at 1908.1nm by two etalons inserted in the cavity. The laser beam quality factors M2 were measured to be 1.79, 1.85 and 1.90 at the output power of 20.1W, 41.2W and 65W, respectively. A laser wavelength shift of only 0.1nm with the incident pump power varying from 20.1W to 184.6W was observed.
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