Fig. 1. Experimental setup of high-power mid-infrared femtosecond optical frequency comb

Fig. 2. Evolution of super-continuum spectrum with incident light power

Fig. 3. Output characteristics of thulium-doped fiber amplifier. (a) Output spectra of seed light and amplifier; (b) autocorrelation trace of pulse after compression

Fig. 4. Relative intensity noise characteristics of high-power mid-infrared optical frequency combs. (a) RIN of seed light and amplified pulse after compression; (b) integrated RIN curves

Fig. 5. Phase noise power spectra of seed light and amplified pulse after compression

Fig. 6. Supercontinuum spectrum obtained by fluorotellurite fiber

Fig. 7. Optical path diagram of beat signal detection system

Fig. 8. Beat signal between high power mid-infrared optical frequency comb and Nd∶YAG laser