Apparatus for providing optical radiation

Details Apparatus for providing optical radiation Apparatus for providing optical radiation

2011-05-03

2011-05-03

Harvey, Minsun (Department: 2828)

Coherent light generators

Optical fiber laser

C372S025000, C372S070000

Reexamination Certificate

active

07936796

ABSTRACT:
In one embodiment, a photo-darkening resistant optical fiber includes a waveguide having a numerical aperture less than 0.15. The waveguide includes a core having a refractive index n1and a pedestal having a refractive index n2, and wherein the fiber includes a first cladding having a refractive index n3surrounding the pedestal, wherein n1is greater than n2, n2is greater than n3. The core includes silica, a concentration of alumina of between approximately 0.3 to 0.8 mole percent, a concentration of phosphate of substantially 15 mole percent, a concentration of ytterbium substantially in the range 20000 to 45000 ppm. The pedestal can include silica, phosphate and germania. The core can have substantially zero thulium dopant.

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