Surfaces of Capillaries
interior surface of capillaries made by the etching process is the
smooth interface between the polished surfaces of the cladding and
the etchable core. After the chemical removal of the etchable core
element, few defects larger than 1/100th of a capillary diameter
remain. The etched holes can be individually straight and parallel,
and (within the limits of the etching process) curved and twisted
collectively. Diameter variation from capillary to capillary is
typically less than 2% along the length.
drawn capillaries, the interior is fire polished during the draw
process, producing a smooth, virtually defect-free surface. Drawn
capillaries are more easily formed into non-parallel, non-linear
forms than etched capillaries.
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