Raman spectra and oxygen‐related absorption bands in pure silica core fibres

Abstract

The Raman spectra of pure silica core fibres revealed the presence of molecular oxygen, which may be responsible for two absorption bands, one at 0.76 and the other at 1.27 Fm.There has been a renewal of interest in pure silica core fibres owing to their inherently low losses and dispersion between 1.2 and 1.6 pm. In this region, the main cause of attenuation is the presence of the OH absorption bands. A recent study of the loss spectrum of pure and fluorine-doped silica fibres of low OH content by Heitmann et aL' revealed the existence of a new absorption band at 1.273 pm, which always appears associated with another one located around 0.765 pm. They tentatively assigned these bands to the presence of crystallites in the silica matrix which could not be detected by x-ray analysis. We present here new evidence, from a Raman analysis of fibres, that suggests a different origin for these absorption bands.

Resonance Raman of oxygen dangling bonds in amorphous silicon dioxide

“…After the O 2 treatment, only a small narrow peak appears at~1550 cm À1 , which is due to the stretching vibration of interstitial O 2 molecules. [13][14][15] The subsequent X-ray irradiation is responsible for the appearance of a band at about 900 cm À1 . In the inset of Fig.…”

Diffusion and reactions of interstitial oxygen species in amorphous SiO2: A review

“…The presence of interstitial O 2 has been first confirmed by a Raman observation of the O-O stretching mode appeared in a-SiO 2 optical fibers of low hydroxyl (SiOH) concentrations [7], which were prepared by oxidation of SiCl 4 in hydrogen-free plasma flame (often termed 'type IV' silica) [8].…”

Influence of <formula formulatype="inline"><tex Notation="TeX">${\hbox{O}}_2$</tex></formula>-Loading Pretreatment on the Radiation Response of Pure and Fluorine-Doped Silica-Based Optical Fibers

“…Several techniques are available to detect molecular oxygen dissolved in silica samples: optical absorption [12], photoluminescence [13] and Raman scattering [12], [14].…”