Valliammai M, Sivabalan S
Appl Opt. 2017 Jun 1;56(16):4797-4806. doi: 10.1364/AO.56.004797.
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 to 10) from 3.5 to 15 μm wavelengths and exhibits a low confinement loss (10 to 10) for the wavelengths from 2 to 15 μm with single mode behavior. The proposed GeAsSe PQF is designed with zero dispersion wavelengths (ZDWs) at 4.33 and 4.46 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.
我们报道了一种用于宽带中红外（MIR）超连续谱（SC）产生的保偏硫族化物（ChG）光子准晶光纤（PQF）。对于2kW的脉冲功率，在所提出的PQF中产生SC的数值演示涵盖了2至15μm的波长范围。此外，所提出的PQF在3.5至15μm波长范围内具有高双折射（10至10），并且对于2至15μm波长呈现出低限制损耗（10至10）且具有单模特性。所提出的GeAsSe PQF在2 - 15μm波长范围内，X和Y偏振模式的零色散波长（ZDWs）分别设计为4.33μm和4.46μm。使用长度为8mm的所提出的PQF，首次在2至15μm范围内实现了连续谱的偏振光谱展宽。因此，两个正交偏振模式在调谐SC特性方面具有高度自由度。因此，所提出的基于PQF的SC源是光学传感、频率计量和光学断层扫描等应用的良好候选者。
