Sopalla Rafal P, Wong Gordon K L, Joly Nicolas Y, Frosz Michael H, Jiang Xin, Ahmed Goran, Russell Philip St J
Opt Lett. 2019 Aug 15;44(16):3964-3967. doi: 10.1364/OL.44.003964.
We compare the properties of the broadband supercontinuum (SC) generated in twisted and untwisted solid-core photonic crystal fibers when pumped by circularly polarized 40 picosecond laser pulses at 1064 nm. In the helically twisted fiber, fabricated by spinning the preform during the draw, the SC is robustly circularly polarized across its entire spectrum whereas, in the straight fiber, axial fluctuations in linear birefringence and polarization-dependent nonlinear effects cause the polarization state to vary randomly with the wavelength. Theoretical modelling confirms the experimental results. Helically twisted photonic crystal fibers permit the generation of pure circularly polarized SC light with excellent polarization stability against fluctuations in input power and environmental perturbations.
我们比较了在1064nm波长的圆偏振40皮秒激光脉冲泵浦下，扭曲和未扭曲的实芯光子晶体光纤中产生的宽带超连续谱（SC）的特性。在通过拉丝过程中旋转预制棒制造的螺旋扭曲光纤中，SC在其整个光谱范围内都具有很强的圆偏振特性，而在直光纤中，线性双折射的轴向波动和偏振相关的非线性效应会导致偏振态随波长随机变化。理论建模证实了实验结果。螺旋扭曲的光子晶体光纤能够产生具有优异偏振稳定性的纯圆偏振SC光，可抵抗输入功率波动和环境扰动。
