Dispersion Measurement of Ultra-High Numerical Aperture Fibers covering Thulium, Holmium, and Erbium Emission Wavelengths

TL;DR

This paper provides broadband group velocity dispersion measurements of ultra-high numerical aperture fibers across key emission wavelengths, aiding the design of ultrafast fiber lasers and nonlinear optics research.

Contribution

It offers the first comprehensive, consistent dispersion data for commercially available UHNA fibers in the 2 μm region using spectral interferometry.

Findings

Dispersion data for UHNA fibers across erbium, thulium, and holmium bands.

Comparison of measured dispersion with literature reports.

Fitting parameters enabling replication of dispersion profiles.

Abstract

We present broadband group velocity dispersion (GVD) measurements of commercially available ultra-high numerical aperture fibers (UHNA1, UHNA3, UHNA4, UHNA7 and PM2000D from Coherent-Nufern). Although these fibers are attractive for dispersion management in ultrafast fiber laser systems in the 2 {\mu}m wavelength region, experimental dispersion data in literature is scarce and inconsistent. Here we demonstrate the measurements using the spectral interferometry technique covering the typically used erbium, thulium and holmium emission bands. The results are characterized in terms of the standard-deviation uncertainty and compared with previous literature reports. Fitting parameters are provided for each fiber allowing for the straightforward replication of the measured dispersion profiles. This work is intended to facilitate the design of ultrafast fiber laser sources and the investigations of nonlinear optical phenomena.