Principal Axes’ Orientation Measurements of Antiresonant Hollow-core Fibers in Multiple Transmission Windows

Here we investigate the principal axes’ orientation of two antiresonant hollow-core fiber samples with C
6
and C
4
rotation symmetries of their cladding capillaries with thickness of about 2.5 μm in three different transmission windows located around 1.3, 1.6, and 2.35 μm.