Abstract
We report a monolithic Tm:YLF micro laser in this Letter. In order to improve the
relaxation oscillation of the laser, both ends of the crystal are coated, making the
Tm:YLF crystal itself a resonant cavity. The micro laser is pumped by a 792 nm laser
diode operated in the continuous wave (CW) mode. We obtain maximum output powers of 7.78
and 10.4 W at the total incident power of 43.6 W with focus lenses of 37.5 and 40 mm,
respectively, corresponding to the slope efficiencies of 25.6% and 40.0% and the
optical–optical conversion efficiencies of 17.8% and 23.8%. It is clear that the
amplitude of the relaxation oscillation is smaller and the beam quality is better with
the focus length of 37.5 mm; however, the laser with the focus length of 40 mm produces
a higher output power and a more stable wavelength centering at 1878.44 nm.
© 2016 Chinese Laser Press
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