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Ytterbium‐doped polarization‐maintaining fiber in a pedestal geometry is demonstrated using MCVD and a novel in‐situ doping technique. The aluminosilicate pedestal layers minimize the thermal expansion mismatch against the silica outer cladding and permits complete freedom of location for the stress‐applying parts in the fiber. A birefringence of 2.4×10–4 is experimentally determined. The fiber delivers...
We report efficient laser demonstration and spectroscopic characteristics of a Yb-doped Y 2 O 3 (or Y 3 Al 5 O 12 ) nanoparticle silica fiber developed by conventional fiber fabrication technique. The spectroscopy study evidences modification in the environment of Yb ions by the Y 2 O 3 nanoparticles. As a result, photodarkening induced loss...
Photodarkening (PD) in optical fibers is a serious concern for the development and maintenance of the reliable operation of high-power ytterbium fiber lasers (YDFL), over a long period of time. Formation of colour centres in the silica glass host is often believed to be the reason behind PD [1]. Yb-doped aluminosilicate fiber suffers PD as a permanent excess optical loss (unless optically or thermally...
Recently developed novel ’flat fiber’ substrate promises flexible, long-haul integrated optical devices. Here, we present the first demonstration of one such device; an evanescent field sensor, based upon direct UV written Bragg gratings.
Recently developed novel psilaflat fiberpsila substrate promises flexible, long-haul integrated optical devices. Here, we present the first demonstration of one such device; an evanescent field sensor, based upon direct UV written Bragg gratings.
First demonstration of planar Bragg gratings UV written into collapsed fibre planar samples with ≫200??m cladding thickness is presented. Multiple gratings were written across the sample profile to accurately determine core layer flatness and uniformity.
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