30um 50um 70um 0.56NA 0.64NA High numerical aperture (NA) optical
fibers
OPTICAL FIBER Optical Fiber is made up of two materials; a high-refractive-index
core, and a low-refractive-index cladding.
Light that is injected into one end of an optical fiber can travel
through it with little attenuation (signal loss).
However, the amount of signal loss depends on the color of the
light, the design of the optical fiber, the materials used,
and the manufacturing configuration and process controls.
in multimode structures, for fluorescence monitoring and for
double-clad fiber lasers. In high-power fiber lasers, low-bright
ness high-power laser diodes are coupled into the high NA inner
cladding of a double-clad fiber with a doped core. Raising
the NA of the inner cladding allows the same pump power to be
coupled into a smaller diameter inner cladding. This improves
the pump absorption by increasing the overlap of the pump light
with the doped core. For collection of light from diffuse sources
and transmission to remote detection equipment, increasing the NA
increases the amount of light captured for a certain fiber
diameter.
In order to achieve a large NA, one must arrange for a core and
cladding material of widely differing indexes.
Unfortunately, the range of indexes available in transparent solids
(including glass and plastics) is relatively small,
the lowest attainable value being approximately 1.3.
For a core of silica glass, this yields a maximum NA of the order
of 0.6. In practice, NAs above 0.4 are extremely uncommon in silica
fibers.
Main features.
l Large numerical aperture (NA>0.5);
l Low loss (<11 dB/Km @1310 nm; <5 dB/Km@1550 nm);
l Large core diameter (50, 80, 100 um available);
Main applications.
Power transmission;
Spectroscopy.
Instrumentation.
| Product reference | P-HCW-XX-YYY |
| Cladding diameter(um) | 80 to 160(+/- 5 um) |
| Core diameter(um) | 50, 80 and 100 (+/-3 um) |
| Core material | Silica F300 |
| Coating diameter(um) | 245(+/- 5 um) |
| Coating material | Dual coat acrylate |
| Numerical aperture | >0.5 |
| Background losses(d B/km)@1310 nm | <11 |
| Background losses(d B/km)@1550 nm | <5 |
| Minimal web thickness(nm) | 150 |
