Wide-band supercontinuum generation in mid-IR using polarization maintaining chalcogenide photonic quasi-crystal fiber.

TLDR: The proposed PQF-based SC source is a good candidate for applications such as optical sensing, frequency metrology, and optical tomography as the two orthogonally polarized modes allow the high degree of freedom in tuning the properties of the SC.

Abstract: We report a polarization maintaining chalcogenide (ChG) photonic quasicrystal fiber (PQF) for wide-band mid-IR (MIR) supercontinuum (SC) generation The numerical demonstration of SC generation in the proposed PQF spans from 2 to 15 μm wavelengths for a pulse power of 2 kW Besides, the proposed PQF offers a high birefringence (10−3 to 10−2) from 35 to 15 μm wavelengths and exhibits a low confinement loss (10−7 to 10−1) for the wavelengths from 2 to 15 μm with single mode behavior The proposed Ge115As24Se645 PQF is designed with zero dispersion wavelengths (ZDWs) at 433 and 446 μm for X and Y polarized modes within the wavelength range of 2–15 μm The polarized spectral broadening of the continuum is realized for the first time from 2 to 15 μm using the proposed PQF with a length of 8 mm Hence, the two orthogonally polarized modes allow the high degree of freedom in tuning the properties of the SC Thus, the proposed PQF-based SC source is a good candidate for applications such as optical sensing, frequency metrology, and optical tomography