TAPERS
When
single
optical
rods or
"Multi
element"
rods are
tapered,
the resulting
optical
characteristic
of the
rod changes,
reducing
the NA
of the
normal
end, while
maintaining
the original
NA at
the tapered
end. The
amount
of change
is a ratio
of the
diameters.
If a .25"
diameter
rod has
an NA
of .5,
and the
rod is
tapered
to .125"
diameter,
the NA
change
is 50%
(.125/.250)
at the
large
end, making
the new
NA .25.
Therefore,
when light
enters
the small
end of
a taper
at full
acceptance
angle,
the emerging
beam at
the other
end is
somewhat
collimated,
when compared
to the
original
range
of entry
angles.
Need
more information?
Contact
Tim
Beeman.
Or call
us toll
free at
1.800.433.5248
Tapers
are used
in myriad
of applications,
especially
in scopes
to increase
the NA
of the
fiber.
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