A simultaneously gain-switched and mode-locked Tm/Ho-codoped fiber laser with a central wavelength of 1958 nm is reported for the first time to the authors' knowledge. The repetition rates of the gain-switched pulse envelopes and mode-locked sub-pulses are 20 kHz and 14.8 MHz, respectively. Using this laser as a seed source, a flat mid-IR supercontinuum is generated from a Tm-doped fiber amplifier. For the maximum output power of 2.17 W, the long wavelength edge of the supercontinuum spectrum is extended to 2750 nm, and the supercontinuum has a 10 dB bandwidth of 640 nm (a spectral range of ~1953–2593 nm).
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Yang et al. (2013) studied this question.
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