Cargille™ Laboratories Optical Gels
For use in coupling applications
Cargille Optical Gels Codes
0607 and
0608 have two major uses. First, as an
optical coupling for optical fibers and optical components, they reduce or
eliminate internal reflectance thus increasing transmittance of light. They
do this by having a refractive index and dispersion that is similar to many
glasses and optical plastics. they also closely matche the refractive index
and dispersion of fused silica.
A second use is as a mode stripping gel. When one of the gels is coated on a
silica fiber that has a cladding, it will remove the signal from the
cladding. This is useful when evaluating fiber systems, using only short
fiber lengths, in that the signal that is carried for a short distance in
the cladding can be eliminated from the system and detectors will record
only the signal propagated by the fiber core. This is quicker and easier
than mechanically stripping away the cladding and is non-destructive.
The gels are transparent to radiation in the near UV, the visible, and the
near infrared. We know of no other liquids, gels, or greases with
significantly better transmittance. Each has wide temperature stability.
Freezing points are below -67°C and boiling point exceeds 400°C. This means
a more stable refractive index than some other liquid, gel or grease
couplants.
Optical Gel Codes
0607 and
0608 are optically and chemically nearly
identical, and both are used for coupling optical fibers and other optical
components, and for mode stripping. Optical Gel Code
0607 is a thinner gel
than
0608 and, upon standing, the surface of 0607 will normally appear to be
fluid. Code 0608 appears to be much less fluid.
Optical Gel Code 0607, although not water soluble, is made to "disperse"
when immersed in water to facilitate cleaning.
Optical Gel Code 0608 was specially made not to "disperse" in water, for
applications where water immersion without dispersing or changing is
required.
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Sunday March 21, 2010
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