APPARATUS AND METHODS USING HOLLOW-CORE FIBER TAPERS

摘要

An optical filter and methods of filtering are provided. The optical filt er includes a hollow-core fiber including a first portion and a second porti on. The first portion includes a hollow core having a first diameter and a c ladding having a second diameter. The second portion includes a hollow core having a third diameter smaller than the first diameter and a cladding havin g a fourth diameter smaller than the second diameter.