Continuous-annealing method for producing a flexible, curved, soft magnetic amorphous alloy ribbon J. Appl. Phys. 111, 07A309 (2012) Fabrication of nanoscale glass fibers by electrospinning Appl. Phys. Lett. 100, 063114 (2012) Thermodynamic, Raman and electrical switching studies on Si15Te85-xAgx (4 ≤ x ≤ 20) glasses J. Appl. Phys. 111, 033518 (2012)
Synthesis of single-component metallic glasses by thermal spray of nanodroplets on amorphous substratesThe primary excited state decay and energy transfer processes in singly Tm 3þ -doped TeO 2 :ZnO:Bi 2 O 3 :GeO 2 (TZBG) glass relating to the 3 F 4 ! 3 H 6 $1.85 lm laser transition have been investigated in detail using time-resolved fluorescence spectroscopy. Selective laser excitation of the 3 H 4 manifold at 794 nm, the 3 H 5 manifold at 1220 nm, and 3 F 4 manifold at 1760 nm has established that the 3 H 5 manifold is entirely quenched by multiphonon relaxation in tellurite glass. The luminescence from the 3 H 4 manifold with an emission peak at 1465 nm suffers strong suppression due to cross relaxation that populates the 3 F 4 level with a near quadratic dependence on the Tm 3þ concentration. The 3 F 4 lifetime becomes longer as the Tm 3þ concentration increases due to energy migration and decreases to 2.92 ms when [Tm 3þ ] ¼ 4 mol. % as a result of quasi-resonant energy transfer to free OH À radicals present in the glass at concentrations between 1 Â 10 18 cm À3 and 2 Â 10 18 cm À3 . Judd-Ofelt theory in conjunction with absorption measurements were used to obtain the radiative lifetimes and branching ratios of the energy levels located below 25 000 cm À1 . The spectroscopic parameters, the cross relaxation and Tm 3þ ( 3 F 4 ) ! OH À energy transfer rates were used in a numerical model for laser transitions emitting at 2335 nm and 1865 nm. V C 2012 American Institute of Physics. [http://dx.
We present the fabrication and characterization of two high concentration Yb 3+ -Er 3+ co-doped double clad phosphate glass optical fibers (named A and B for short) manufactured by preform drawing, with the preform being obtained by the rod-in-tube technique. Optical amplification was demonstrated by core pumping 27 mm of fiber A (7/25/70 μm and NA = 0.17 between core and inner cladding) with a laser diode at 976 nm, achieving a 10.7 dB internal gain, i.e., 4.0 dB cm −1 , for small signal input at 1535 nm. Amplification was also demonstrated in a cladding-pumped counter propagating configuration using both fibers A and B (12/48/140 μm and NA = 0.08). A maximum internal gain of 18.5 dB was achieved with 8 cm of fiber B, corresponding to an amplification of 2.3 dB cm −1 , for small signal input at 1535 nm.
We report on the fabrication and optical assessment of an all-solid tellurite-glass photonic bandgap fiber. The manufacturing process via a preform drawing approach and the fiber characterization procedures are described and discussed. The fiber exhibits some minor morphological deformations that do not prevent the observation of optical confinement within the fiber by bandgap effects. The experimental fiber attenuation spectrum displays clear bandgap confinement regions whose positions are confirmed by modeling the guiding properties of the ideal geometry using a plane-wave expansion method. The model identifies the bound modes of the structure and provides confirmation of experimentally observed mode field profiles.
We present a microstructured fiber whose 9 µm diameter core consists in three concentric rings made of three active glasses having different rare earth oxide dopants, Yb3+/Er3+, Yb3+/Tm3+ and Yb3+/Pr3+, respectively. Morphological and optical characterization of the optical fiber are presented. The photoluminescence spectrum is investigated for different pumping conditions using a commercial 980 nm laser diode. Tuning of the RGB (or white light) emission is demonstrated not only by adjusting the pump power but also by using an optical iris as spatial filter which, thanks to the microstructured core, also acts as a spectral filter.
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