Erbium-activated silica xerogels: spectroscopic and optical properties

Duverger, C.; Montagna, M.; Rolli, Raffaella; Ronchin, S.; Zampedri, L.; Fossi, Matteo; Pelli, S.; Righini, Giancarlo C.; Monteil, A.; Armellini, C.; Ferrari, M.

doi:10.1016/s0022-3093(00)00383-5

Cited by 55 publications

(24 citation statements)

References 32 publications

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“…1͑II͒. 7,9 The Raman spectra do not show any evidence of hafnia crystallization, that would display several sharp peaks in the region between 100 and 800 cm Ϫ1 .…”

mentioning

confidence: 97%

“…[1][2][3][4][5] The key requirements for developing EDWAs by the sol-gel route are: ͑i͒ refractive index and thickness of the film have to be tailored, in order to satisfy both single-mode condition at 1.5 m and efficient coupling to fibers; ͑ii͒ the structural and optical homogeneity have to be optimized, in order to reduce losses and rare-earth clustering; 1,5 and ͑iii͒ the OH groups must be effectively removed, because the 4 I 13/2 luminescence of OH Ϫ -coordinated Er 3ϩ ions is completely quenched by two phonon-OH mechanism. 6,7 Among the silica-based systems, binary SiO 2 -TiO 2 has been widely used to produce Er-activated planar waveguides by sol-gel route. 1,2,8,9 However, in the silica-titania system, there is a tendency for separation between SiO 2 -rich and TiO 2 -rich phases.…”

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confidence: 99%

“…The details about the experimental setup were previously reported. 7,9,11 The optical and spectroscopic parameters are reported in Table I.…”

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confidence: 99%

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Sol-gel Er-doped SiO2–HfO2 planar waveguides: A viable system for 1.5 μm application

Gonçalves

Carturan

Zampedri

et al. 2002

Applied Physics Letters

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110

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70SiO 2 – 30HfO 2 planar waveguides, doped with Er3+ concentrations ranging from 0.3 to 1 mol %, were prepared by sol-gel route, using dip-coating deposition on silica glass substrates. The waveguides show high densification degree, effective intermingling of the two components of the film, and uniform surface morphology. Propagation losses of about 1 dB/cm were measured at 632.8 nm. When pumped with 987 or 514.5 nm continuous-wave laser light, the waveguides show the I413/2→I415/2 emission band with a bandwidth of 48 nm. The spectral features are found independent both on erbium content and excitation wavelength. The I413/2 level decay curves presented a single-exponential profile, with a lifetime between 2.9 and 5.0 ms, depending on the erbium concentration.

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“…1͑II͒. 7,9 The Raman spectra do not show any evidence of hafnia crystallization, that would display several sharp peaks in the region between 100 and 800 cm Ϫ1 .…”

mentioning

confidence: 97%

mentioning

confidence: 99%

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Sol-gel Er-doped SiO2–HfO2 planar waveguides: A viable system for 1.5 μm application

Gonçalves

Carturan

Zampedri

et al. 2002

Applied Physics Letters

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110

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“…These modes are still present in the samples heat-treated at 600ºC. With higher annealing temperature, starting from 800ºC, they disappear because of the elimination of water from inside the thin films [8]. Fig.…”

Section: Ftirmentioning

confidence: 91%

SnO2 based glasses: a viable photonic system

Tran¹,

Meneghetti²,

Żur³

et al. 2016

18th Italian National Conference on Photonic Technologies (Fotonica 2016)

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This version is available at https://strathprints.strath.ac.uk/60983/ 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 AbstractThe present work focuses on sol-gel derived SnO 2 -based thin glass-ceramic films doped with Er 3+ ions, fabricated by dipcoating technique. Our goal is to find a viable fabrication protocol to obtain them. Thin films with a variety of composition were synthesized and their structural, optical and spectroscopic properties were investigated. The FTIR spectra and X-ray diffraction patterns were used to characterize the structure of the thin films. The transparency of the thin film was tested by UV-Vis transmittance measurements. The energy transfer dynamic was investigated by time-resolved spectroscopy and photoluminescence measurements.

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“…The observed gradient of the refractive index can be ascribed to the erbium concentration gradient. 24 The squared electric-field patterns of four TE m modes ͑the waveguide has six TE modes at 514.5 nm͒ are also shown on the left-hand side of Fig. 4.…”

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confidence: 97%

Brillouin scattering in planar waveguides. II. Experiments

Chiasera

Montagna

Moser

et al. 2003

Journal of Applied Physics

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Silica-titania planar waveguides of different thicknesses and compositions have been produced by radio-frequency sputtering and dip coating on silica substrates. Waveguides were also produced by silver exchange on a soda-lime silicate glass substrate. Brillouin scattering of the samples has been studied by coupling the exciting laser beam with a prism to different transverse-electric ͑TE͒ modes of the waveguides, and collecting the scattered light from the front surface. In multimode waveguides, the spectra depend on the m mode of excitation. For waveguides with a step index profile, two main peaks due to longitudinal phonons are present, apart from the case of the TE 0 excitation, where a single peak is observed. The energy separation between the two peaks increases with the mode index. In graded-index waveguides, mϪ1 peaks of comparable intensities are observed. The spectra are reproduced very well by a model which considers the space distribution of the exciting field in the mode, a simple space dependence of the elasto-optic coefficients, through the value of the refraction index, and neglects the refraction of phonons. A single-fit parameter, i.e., the longitudinal sound velocity, is used to calculate as many spectra as is the number of modes in the waveguide.

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Erbium-activated silica xerogels: spectroscopic and optical properties

Cited by 55 publications

References 32 publications

Sol-gel Er-doped SiO2–HfO2 planar waveguides: A viable system for 1.5 μm application

Sol-gel Er-doped SiO2–HfO2 planar waveguides: A viable system for 1.5 μm application

SnO2 based glasses: a viable photonic system

Brillouin scattering in planar waveguides. II. Experiments

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