Efficient Wideband Supercontinuum Generation in Mid-IR Wavelengths Using Large Mode Area Quasi-Periodic Cladding Leakage Channel Fiber With Low Input Energy

We report a large mode area (LMA), Ge
_11.5
As
₂₄
Se
_64.5
six-fold symmetry quasi-periodic dual cladding leakage channel fiber (LCF) for supercontinuum generation (SCG) from 2 to 15 μm wavelengths. The proposed LMA fiber exhibits single-mode behavior by means of higher order mode delocalization for the entire wavelengths. Besides, the LCF possesses two zero dispersion wavelengths at 4.36 and 14.16 μm. Indeed, we numerically demonstrated the spectral broadening of continuum for the first time from 2 to 15 μm in the quasi-periodic dual cladding LCF for a length of 10 mm. It is observed that the red-shifted soliton at the centre wavelength of 9.42 μm obtain an energy of 0.164 nJ for a low input energy of 0.2 nJ. Further, the SCG in the proposed LCF attains a high conversion efficiency of 82 % at the solitonic spectrum and broadest spanning from 2 to 15 μm for the low input energy of 0.2 nJ. Thus, the proposed LCF-based SC source is the best choice for the applications, such as optical sensing, optical communication, food quality monitoring, and early cancer diagnostics.