Source: https://www.osapublishing.org/oe/abstract.cfm?uri=oe-18-19-19479
Timestamp: 2019-04-22 17:21:19+00:00

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Optical properties of a Bismuth-doped pure silica sol-gel core photonic crystal fiber (PCF) were investigated. We report on the absorption, CW luminescence and time resolved luminescence spectra at different excitation wavelengths at room temperature. Complex structure of the energy levels of Bismuth-connected centers in pure silica glass is put in evidence.
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Fig. 1. Absorption spectrum of 450 ppm Bismuth-doped pure silica sol-gel preform in the spectral region of 300–750 nm.
Fig. 2. Scanning Electron Microscope (SEM) image of Bismuth-doped pure silica sol-gel core PCF.
Fig. 3. Attenuation spectrum of Bismuth-doped pure silica sol-gel core PCF in the range of 625 – 1750 nm. Inset: Detailed view of attenuation spectrum in the range of 850 – 1300 nm.
Fig. 4. Detailed view of absorption bands of Bismuth-doped pure silica sol-gel core PCF and their Gaussian decomposition: a) 820 nm band and b) 1400 nm band. Markers - experiment, solid blue line - numerical fit.
Fig. 5. Room temperature NIR PL spectra at various excitation wavelengths: a) 2.2 cm-long PCF, transmission geometry; b) bulk sample, 90° geometry.
Fig. 6. Time-resolved PL spectrum of bulk sample for λexc = 532 nm recorded at T = 10 K.

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