Fig. 2

(a) Attenuation and dispersion spectrum of the hollow-core negative curvature fiber. Two transmission bands (loss < 300 dB/km) are highlighted in yellow. Inset (left): Schematic cross-section of the hypocycloid fiber with eight cladding tubes. Inset (right): Electron micrograph (EM) of the fiber cross-section (scale bar: 10 µm). (b) Schematic of the optical path for coupling the laser source into the fiber and expanding the fiber output’s numerical aperture to match that of the collimation objective (Obj1 in Fig. 1d). (c) Near-field and far-field beam profiles of the fiber output at 515 nm and 1030 nm wavelengths. (d) Measured axial light-sheet profile in the sample plane.