Try Thor Labs.  They have a wide assortment of single and multimode fibers
from different manufacturers.

Thor Labs Inc.
Newton, N.J.
201-579-7227

http://www.thorlabs.com

Best
Richard
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>Hi,
>
>I am looking for fused silica optical fibers for UV with core
>diameter in the range of 10-20 um.  I have contacted several
>manufacturers but cannot find anyone who makes fibers with
>core diameter smaller than 40 um.  I am trying to set up a UV
>uncaging system on a confocal microscope.  Thanks in
>advance for your help!
>
>Terry
>
>********************************
>Terry Wu
>Dept. of Physiology
>University of Minnesota
>6-255 Millard Hall
>435 Delaware Street S.E.
>Minneapolis, MN 55455
>
>Phone:   (612) 625-2407
>Fax:     (612) 625-5149
>E-mail:  [log in to unmask]
>********************************