Fig. 1. Experimental setup of the 30-W SC laser source. EYDFA, erbium-ytterbium-codoped fiber amplifier; SMF, single-mode fiber; SM-TDFA, single-mode thulium-doped fiber amplifier; FS, fusion splice.

Fig. 2. (a) Power characteristics of the TDFA and (b) spectral characteristics of the TDFA with maximal launched pump power (100.9 W at 793 nm) under PRR and pulse duration of 3 MHz 3 ns, 3 MHz 1 ns, and 2 MHz 1 ns. (The measured spectra were not compensated by the detector response.)

Fig. 3. (a) SC spectrum evolution under different TDFA output power for PRR of 3 MHz and pulse duration of 1 ns. (b) SC spectrum comparison with maximal pump power under PRR and pulse duration of 3 MHz 3 ns, 3 MHz 1 ns, and 2 MHz 1 ns.

Fig. 4. SC power as a function of the TDFA output power under PRR and pulse duration of 3 MHz 3 ns, 3 MHz 1 ns, and 2 MHz 1 ns.

Fig. 5. Summary of the literature on 10 W level SC generation based on non-silica fibers with a spectrum extending beyond 3 μm. The bandwidth in the diagram represents full spectral range.