Abstract
Broadband mid-infrared (IR) supercontinuum laser is generated in standard
single-mode fiber-28 directly pumped by a 2054 nm nanosecond Q-switched Tm,Ho:YVO4
laser. The average output powers of 0.53 W in the ~1.95-2.5 µm spectral band and
0.65 W in the ~1.97-2.45 µm spectral band are achieved at pulse rate frequencies of
7 and 10 kHz, and the corresponding optic-to-optic conversion efficiencies are 34.6%
and 42.4% by considering the coupling efficiency. The output spectra have extremely
high flatness in the range 2060-2400 and 2060-2360 nm with negligible intensity
variation (<2%), respectively. The output pulse shape is not split, and pulse
width is reduced from 29 to ~15.4 ns. The beam quality factor M2 is 1.06, measured
using traveling knife-edge method, and the laser beam spot is also monitored by an
IR vidicon camera.
© 2014 Chinese Optics Letters
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