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Optica Publishing Group
  • Chinese Optics Letters
  • Vol. 12,
  • Issue 9,
  • pp. 090605-
  • (2014)

Supercontinuum generation in a standard single-mode fiber by a Q-switched Tm, Ho:YVO4 laser

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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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