Fig. 1. Measured SC spectrum generation in 3-cm-long As₂Se₃ fiber pumped with 9.8 μm pulse laser^[13]

Fig. 2. Optical microscope images of laser-induced surface damage of glasses after irradiation with fs laser at 30 mW for 20 s^[14]. (a) As₂Se₃ glass; (b) Ge₁₅Sb₂₅Se₆₅ glass

Fig. 3. Transmission loss and SC spectrum generation of Ge-As-Se-Te fiber^[18]. (a) Transmission loss of Ge-As-Se-Te fiber; (b) SC spectra from Ge-As-Se-Te fiber pumped by 4.65 μm laser

Fig. 4. SC spectrum generation in Ge-Te-AgI fiber^[23]. (a) Cross section of double-cladding Ge-Te-AgI fiber; (b) SC spectrum from Ge-Te-AgI fiber when pumped by 7 μm laser

Fig. 5. SC spectrum generation in chalcohalide fiber^[24]. (a) Material dispersion curves of chalcohalide glasses. SC spectra from GeSe₂-Ga₂Se₃-CsI double-cladding chalcogenide fiber when pumped by (b) 2.9 μm and (c) 6.3 μm laser

Fig. 6. Drilling schematic of Ge-Sb-Se suspended-core fibers^[29]. (a) Schematic diagram of computer numerical control precision drilling; (b) picture of Ge-Sb-Se fiber preform; (c) cross section of four-hole Ge-Sb-Se fiber preform; (d)(e) cross sections of Ge-Sb-Se suspended-core fibers with different fiber core diameters

Fig. 7. Measured SC spectra from 25-mm-long As₂S₃ fiber pumped by laser with various wavelengths at average power of 190 mW^[31]. (a) Newly prepared; (b) 7-month aged

Fig. 8. Measured SC spectra from As-S tapered fibers with transition region lengths pumped by 3.25 μm laser^[34]

Fig. 9. Measured SC spectra from large-mode-area Ge-As-Se tapered fibers with different fiber lengths at input and output ends without tapering^[35]

Fig. 10. Optical properties of double-cladding chalcogenide fiber^[38]. (a) Cross section and refractive index profile; (b) chromatic dispersion profiles

Fig. 11. SC spectrum generation and its coherence property in double-cladding chalcogenide fibers^[38]. (a) Measured pump light (pump line) and SC spectra (red line) of double-cladding chalcogenide fibers; (b) calculated SC spectrum of double-cladding chalcogenide fiber; (c) calculated degree of coherence of generated SC spectrum. Dotted vertical line indicates ZDW of fiber

Fig. 12. Output properties of SC spectra of AsSe₂ microstructured fiber^[40]. (a) Cross section of chalcogenide microstructured fiber; (b) calculated group velocity dispersion of microstructured fiber. Inset: measured refractive indexes of AsSe₂ and As₂S₅ glasses; (c) measured output SC spectrum (black curve) and simulated SC spectrum (red curve) from microstructured fiber pumped by 2.7 μm laser; (d) simulated de

Fig. 13. Dispersion characterization and SC spectra of As-S tapered fiber^[41]. (a) Dispersion characteristic curves of As-S fibers with different fiber core diameters; (b) coherence properties of SC spectra for As-S fiber with different fiber core diameters

Fig. 14. SC spectra and coherence property of As-S tapered fibers^[43]. (a)(c)(e) SC spectra from As-S tapered fibers with asymmetric transition region length; (b)(d)(f) coherence properties corresponding to Figs. 14 (a), (c), and (e)

Fig. 15. All-fiber SC sources based on MOPA^[44]. (a) Setup of all-fiber-based SC source based on MOPA; (b) all-fiber-based SC sources with high output power generated in As-S fiber based on MOPA

Fig. 16. All-fiber SC sources based on mode-locked fiber laser^[48]. (a) Layout of Ho³⁺-doped mode-locked fiber laser and subsequent SC generation; (b) SC generation from As-Se tapered fiber with fiber core diameter of 3 μm. Inset shows mode field profile of tapered fiber at different wavelengths

Fig. 17. Setup diagram of cascaded pump SC source^[49]

Fig. 18. All-fiber SC sources based on MOPA and cascade pump^[53]. (a) Setup of all-fiber SC source based on MOPA and cascade pump; (b) measured SC spectra from ZBLAN (black line), AS₂S₃ (red line), and As₂Se₃ (blue line) fibers

Table 1. Main research results of SC spectrum generation in step-index, microstructure, and tapered chalcogenide fibers in recent two years