Optical properties of GeO_2 glass and optical fibers

Sakaguchi, Shigeki; Todoroki, Shin‐ichi

doi:10.1364/ao.36.006809

Cited by 68 publications

(31 citation statements)

References 22 publications

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“…The depolarization factor (contribution of anisotropic factor) found for HPFS  is between 0.02 and 0.04 for different wavelengths, see Figure 4. This is similar to earlier reported values [6].…”

Section: Discussionsupporting

confidence: 94%

“…For fused silica, the intensity of scattering may be described by isotropic contributions (density and composition fluctuations) and anisotropic fluctuations which are connected to the shear elastic strain [6]. The depolarization factor (contribution of anisotropic factor) found for HPFS  is between 0.02 and 0.04 for different wavelengths, see Figure 4.…”

Section: Discussionmentioning

confidence: 96%

“…Overall, for fused silica the density fluctuation loss-coefficient can be expressed as [6]: α = 8π 3 / 3λ 4 n 8 p 2 kT g β T…”

Section: Discussionmentioning

confidence: 99%

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Scattering losses in fused silica and CaF 2 for DUV applications

Logunov

Kuchinsky

2003

SPIE Proceedings

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Scattering losses for fused silica were measured over a wide wavelength range (193-800 nm) using different laser sources. The data indicate that scattering centers are smaller than ~ 12 nm, and scattering is consistent with Rayleigh type even at 193 nm. Scattering losses scale with wavelength as 1/λ 4 , and scattering loss at 193 nm was found to be (0.65± 0.08)x10 -3 / cm absorption units or (0.15±0.02)% transmission per cm. CaF 2 measurements were completed in the visible wavelength range. The experimental approach for DUV wavelength measurements for CaF 2 is described. Estimated scattering losses at 193 nm are ~0.003% transmission per cm and ~0.006% transmission per cm at 157 nm. Data for CaF 2 indicate deviation from Rayleigh-type scatter.Introduction.

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Section: Discussionsupporting

confidence: 94%

Section: Discussionmentioning

confidence: 96%

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Scattering losses in fused silica and CaF 2 for DUV applications

Logunov

Kuchinsky

2003

SPIE Proceedings

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“…First, the result can provide related insights into formation processes of photo-induced Bragg-reflectors in Ge-doped SiO2, in which Ge atoms seem to play important roles [3]. Second, pure GeO2 optical fibers and waveguides are promising to some applications [6,7], so that photo-induced changes should be explored. The last, which may be the most interesting from fundamental viewpoints, is that the result on GeO2 can bridge photo-induced behaviors in the oxide glass such as SiO2 and the chalcogenide such as GeS2.…”

Section: Introductionmentioning

confidence: 99%

Photo-induced phenomena in GeO2 glass

Terakado

Tanaka

2006

Journal of Non-Crystalline Solids

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Photo-induced changes in GeO2 glass have been studied in optical and structural properties. Band-gap excitation gives rise to modifications in mid-gap optical absorption and photo-luminescence spectrum. It also produces electron-spin signals at g ≃ 1.995 and 2.008.Raman-scattering spectrum becomes sharper, x-ray diffraction patterns show disappearance of a crystalline peak, and illuminated surfaces expand. These observations can be accounted for by assuming bond transformations from rutile-like to defective quartz-like structures and/or from small to large rings. These photo-induced changes in GeO2 are comparatively discussed with those in SiO2 and GeS2.

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“…The work was followed up by Sakaguchi et al from Nippon Telegraph and Telephone Corporation (NNT). Although a significant reduction of fibre loss of 0.15 dB km −1 at 2 µm was predicted using a fluorine doped cladding, little actual improvement was made [Sak97].…”

Section: Vapour-phase Axial Deposition (Vad)mentioning

confidence: 99%

New materials, regimes and applications of fibre laser techonology

Zhang,

Ferrari,

Obraztsova

et al. 2014

International Photonics and OptoElectronics Meetings

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Nonlinear optics enables the manipulation of spectral and temporal characteristics of optical pulses interacting with a dielectric medium. Optical fibres, as a uniquely practical medium, provide an environment for effectively exploiting the nonlinear effects. This has facilitated the rapid growing interest in this field focused on the investigation of fibrebased sources incorporated with various novel saturable absorber devices for ultrashort pulse generation.This thesis reports a series of experiments exploring the ongoing research in the field of nonlinear optics, including the development of ultrafast mode-locked fibre sources and their applications in supercontinumm generation and third order parametric interactions in new carbon materials.Firstly, the integration of carbon-based materials with rare-earth doped media allows the demonstration of ultrafast mode-locked laser sources operating at wavelengths across the near-infrared region in a compact, low cost and environmentally robust scheme.Power scaling of such sources can be achieved by operating in the all-normal dispersion regime making use of a glass-substrate saturable absorber device that exhibits a higher damage threshold.Supercontinuum generation has been used as an effective method for spectral broadening. Pumping with a conceptually simple and reliable fibre-based system, a continuum covering from 2 to 3 µm is generated in a highly nonlinear GeO 2 fibre. This experiment demonstrates a robust and long-term stable source of radiation in an important band, coincident with a portion of the atmospheric transmission window.Finally, the demonstration of a simple and compact nano-material based dual-wavelength system shows the performance of such devices as a simultaneous saturable absorber and passive synchroniser. An experimental study of coherent frequency mixing at large frequency shifts in a graphene sample, pumped by a two-colour fibre-integrated source, proves the strong nonlinear response of this new carbon material. Woodward who not only provided company inside and outside of the lab, but were also happy to discuss and help all matters of my work and life in UK. In particular, I would like to thank Ed for providing me with much needed support, interesting discussions (especially on food and culture) and continued collaboration since I joined the group. Tim, for making couplers for the Tm-system. Thanks to Tim, Robbie (shared the same office over the past three years!), Ed, and Rob for endless support, spending hours and hours proof reading chapters of this thesis and cheering me up all the time. Thanks to the visitor from A*STAR (Singapore), Dr. Dora Hu (more like a sister), for proof reading and encouraging me to relax during the thesis writing.

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Optical properties of GeO_2 glass and optical fibers

Cited by 68 publications

References 22 publications

Scattering losses in fused silica and CaF 2 for DUV applications

Scattering losses in fused silica and CaF 2 for DUV applications

Photo-induced phenomena in GeO2 glass

New materials, regimes and applications of fibre laser techonology

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