Direct observation of UV induced bleaching of 240 nm absorption band in photosensitive germanosilicate glass fibres

Williams, Doug; Davey, Stephen; Kashyap, Raman; Armitage, J.R.; Ainslie, B.J.

doi:10.1049/el:19920231

Cited by 75 publications

(20 citation statements)

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“…Thus, the illumination of the fiber by a perfectly sinusol dat fringe pattern photoinduces a sinusol dal perturbation of the index within the Ge doped fiber core. If one further assumes that the doping of the core is uniform and that the intensity profile and fringe visibility do not vary along entire length of the grating, An(x,y,z,t) can be represented by relation (1) 2z An(x,y,z,t) = in0(t) (…”

mentioning

confidence: 99%

Behaviors of spectral transmissions of photorefractive filters written in germania-doped fibers: writing and erasing experiments

Douay¹,

Xie²,

Fertein³

et al. 1993

SPIE Proceedings

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Photoinscriptions of Bragg gratings have been carried out within several germanosilicate fibers via UV side writing near 243 nm. Real time measurements of the spectral transmission, of the FWHM bandwidth and of the resonance wavelengths of the Bragg gratings lead to noteworthy observations when long irradiation times are used.Thus, second order diffraction efficiency has been observed from Bragg gratings written within some fibers. Second order diffraction can be detected once the first order grating reflectivity has begun to saturate. The complicated evolutions of the first and second order grating specta, observed as a function of the number of UV pulses used for writing the gratings, are taken into account by using a phenomenological model which assumes that two photorefractive effects should be responsible for the grating growth. This assumption is consistent with the results of bleaching and thermal annealing experiments performed within these fibers. On the other hand, the dynamics of grating formation within other fibers looks quite monotonous on the time scale of the writing experiment. The loss absorption spectra of optical preform plates (or fibers), side exposed to 243 nm pulsed irradiation, have been recorded between 210 mn and 320 nm (or between 400 nm and 680 nm within the fibers). Whereas the dynamics of the UV induced excess losses may vary from one sample to another, no obvious direct correlation can be established between the dynamical evolutions of the loss spectra and the features of the grating growth. 1. INTRODUCFION Germanosilicate glass fibers exhibit a well-known photo-induced refractive index change initiated by UV light from lasers tuned to wavelengths lying in the 5 eV 88 / SPIE Vol. 2044 0-8194-1303-8/93/$6.00 Downloaded From: http://proceedings.spiedigitallibrary.org/ on 06/15/2016 Terms of Use: http://spiedigitallibrary.org/ss/TermsOfUse.aspx

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mentioning

confidence: 99%

Behaviors of spectral transmissions of photorefractive filters written in germania-doped fibers: writing and erasing experiments

Douay¹,

Xie²,

Fertein³

et al. 1993

SPIE Proceedings

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“…1, curve 1). Absorption coefficient at the peak is about 11 dB/mm, which is by an order of magnitude lower than the absorption intensity in the peak of Ge-ODC band in Ge-doped silica fibers [12,13]. Bands in the region of 4.5 eV (275 nm) and 5.8 eV (215 nm), which are earlier observed in bulk samples of N-doped silica [6] are also revealed in the spectrum.…”

Section: Fibersmentioning

confidence: 66%

Photoinduced changes in UV absorption spectra of nitrogen-doped silica caused by exposure to ArF excimer laser

Lanin

Kholodkov

Butov

et al. 2009

Journal of Non-Crystalline Solids

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“…The focused beam profile is measured by scanning an optical fiber through the beam waist. The emitted 410 nm fluorescence [16] guided by the fiber is detected using a silicon photodiode and is recorded as a function of position. A horizontal and a vertical beam profile are recorded.…”

Section: Methodsmentioning

confidence: 99%

Rapid characterization of the ultraviolet induced fiber Bragg grating complex coupling coefficient as a function of irradiance and exposure time

Flockhart¹,

Cranch²,

Kirkendall³

2007

Appl. Opt.

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This version is available at https://strathprints.strath.ac.uk/42758/ Strathprints is designed to allow users to access the research output of the University of Strathclyde. Unless otherwise explicitly stated on the manuscript, Copyright © and Moral Rights for the papers on this site are retained by the individual authors and/or other copyright owners. Please check the manuscript for details of any other licences that may have been applied. You may not engage in further distribution of the material for any profitmaking activities or any commercial gain. You may freely distribute both the url (https://strathprints.strath.ac.uk/) and the content of this paper for research or private study, educational, or not-for-profit purposes without prior permission or charge.Any correspondence concerning this service should be sent to the Strathprints administrator: strathprints@strath.ac.ukThe Strathprints institutional repository (https://strathprints.strath.ac.uk) is a digital archive of University of Strathclyde research outputs. It has been developed to disseminate open access research outputs, expose data about those outputs, and enable the management and persistent access to Strathclyde's intellectual output. We report the application of optical frequency domain reflectometry and a discrete-layer-peeling inverse scattering algorithm to the spatial characterization of the UV induced complex coupling coefficient during fiber Bragg grating growth. The fiber grating is rapidly characterized using this technique to give irradiance dependent growth as a function of exposure time, thereby providing the complete characterization of the coupling coefficient in the form of a "growth surface," which is related to the fiber's photosensitivity. We compare measurements of fiber Bragg grating growth in SMF-28 when exposed to continuous wave 244 nm irradiation from 0 to 90 W cm Ϫ2 for exposure times up to 3230 s with a selection of other fibers including high germanium concentration fiber and erbium doped fiber. Rapid characterization of the ultraviolet induced fiber

show abstract

Direct observation of UV induced bleaching of 240 nm absorption band in photosensitive germanosilicate glass fibres

Cited by 75 publications

References 1 publication

Behaviors of spectral transmissions of photorefractive filters written in germania-doped fibers: writing and erasing experiments

Behaviors of spectral transmissions of photorefractive filters written in germania-doped fibers: writing and erasing experiments

Photoinduced changes in UV absorption spectra of nitrogen-doped silica caused by exposure to ArF excimer laser

Rapid characterization of the ultraviolet induced fiber Bragg grating complex coupling coefficient as a function of irradiance and exposure time

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