Fig. 1. Experimental setup for spectral broadening evolution test of tapered PCF samples

Fig. 2. Air-holes structures of PCF samples

Fig. 3. Spectral broadenings of tapered PCF samples

Fig. 4. Spectral broadening evolution of tapered PCF A

Fig. 5. Spectral broadening evolution of tapered PCF B

Fig. 6. Spectral broadening evolution of tapered PCF C

Fig. 7. Spectral absorption test of tapered PCF C after damage

Fig. 8. Spectral broadening evolution of tapered PCF with 1 480 ℃ tapering temperature

Fig. 9. Spectral broadening evolution of tapered PCF with 1 540 ℃ tapering temperature

Fig. 10. Spectral absorptions of tapered PCFs

Fig. 11. Spectral broadening evolution of tapered PCF with argon-filled airholes

Fig. 12. Spectral broadening evolution of tapered PCF with low peak power of pump

Fig. 13. Spectral broadening evolution of tapered PCF with 50% duty cycle chopper

Fig. 14. Spectral broadening evolution of tapered PCF with 25% duty cycle chopper