Abstract
We report a diode-pumped 1.94μm Tm:YLF laser, the maximum output power of which was 50.3W at the incident pump power of 156.9W, corresponding to the optical-to-optical efficiency of 32.1% and slope efficiency of 41.6%. The wavelength was selected and restricted at 1940.2nm by a volume Bragg grating (VBG) and an etalon inserted in the cavity. The laser beam quality factors M2 were measured to be 1.05, 1.75 and 2.40 at the output power of 4.6W, 26.2W and 50.3W respectively.
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