Dispersion measurement of ultra-high numerical aperture fibers covering thulium, holmium, and erbium emission wavelengths

We present broadband group velocity dispersion (GVD) measurements of\ncommercially available ultra-high numerical aperture fibers (UHNA1, UHNA3,\nUHNA4, UHNA7 and PM2000D from Coherent-Nufern). Although these fibers are\nattractive for dispersion management in ultrafast fiber laser systems in the 2\n{\\mu}m wavelength region, experimental dispersion data in literature is scarce\nand inconsistent. Here we demonstrate the measurements using the spectral\ninterferometry technique covering the typically used erbium, thulium and\nholmium emission bands. The results are characterized in terms of the\nstandard-deviation uncertainty and compared with previous literature reports.\nFitting parameters are provided for each fiber allowing for the straightforward\nreplication of the measured dispersion profiles. This work is intended to\nfacilitate the design of ultrafast fiber laser sources and the investigations\nof nonlinear optical phenomena.\n