Fig. 1. Experimental setup of MIR comb generation based on Er-doped, ultrashort pulse fiber laser system.

Fig. 2. Characteristics of output pulse from fiber laser: (a) temporal shape with instantaneous wavelength, (b) optical spectrum, and (c) RF spectra.

Fig. 3. Characteristics of output pulse from fiber amplifier: (a) optical spectrum and (b) temporal shape with instantaneous wavelength.

Fig. 4. Temporal shape and instantaneous wavelength of dispersion compensated ultrashort pulse with LMA-PCF.

Fig. 5. (a), (c), and (e) optical spectra and (b), (d), and (f) temporal shape of output pulse from highly nonlinear fiber for the length of 10, 20, and 30 cm.

Fig. 6. Observed optical spectrum of generated SC in PM-HN-DSF.

Fig. 7. Observed RF noise of fiber laser output and SC.

Fig. 8. Observed RF beat notes between cw-LD and (a) fiber laser at 1550 nm, (b) SC at 1550 nm, and (c) SC at 1680 nm.

Fig. 9. Spectrogram of generated SC in 20 cm of highly nonlinear fiber; (a) experimentally observed spectrogram with X-FROG, and (b) numerically obtained spectrogram with PG-FROG.

Fig. 10. Observed optical spectra of generated MIR comb at wavelengths of (a) 2.9 and (b) 4.9 μm.