• unknown: optical fiber
• unknown: fiber fuse
• unknown: ultrahigh-speed photography

• NIMS Digital Library
• NIMS Digital Library
• NIMS Digital Library

Ultrahigh-speed photographs of fiber-fuse propagation in
single-mode silica fibers revealed a new factor, other than pumping
laser power that affects the morphology of damage sites: the length of
the running optical discharge. Nine W pumping of 1480 nm light
generated a discharge of ~130 um in half-width moving rapidly
and leaving discrete voids along the fiber core, whereas 2-W-pumped
discharge was ~27 um long, moved slowly and left nearly
continuous thin voids. This is because 9-W-pumped discharge takes a
longer time to travel its half-width, about 5/3 times longer than that
of the 2-W-pumped discharge, which provides longer interaction time for
modifying the fiber core.