Improvement of Vacuum-Ultraviolet Transparency of Silica Glass by Modification of Point Defects(Review)

Kajihara, Koichi

doi:10.2109/jcersj.115.85

Cited by 24 publications

(19 citation statements)

References 97 publications

(16 reference statements)

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“…The location of the absorption edge depends on the glass composition, impurity level, and point defects formed during the manufacturing process 17,33 as well as on temperature.…”

Section: 34mentioning

confidence: 99%

Optical constants of silica glass from extreme ultraviolet to far infrared at near room temperature

2007

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“…The location of the absorption edge depends on the glass composition, impurity level, and point defects formed during the manufacturing process 17,33 as well as on temperature.…”

Section: 34mentioning

confidence: 99%

Optical constants of silica glass from extreme ultraviolet to far infrared at near room temperature

2007

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“…As a consequence, a strong research effort is currently devoted to further improve the optical properties of this material in view of prospective vacuum UV (VUV, λ < 200 nm) applications. [1][2][3][4][5] Moreover, a-SiO 2 is an important model system to investigate the physical properties of glassy solids; this study is often aided by a comparison with α-quartz (c-SiO 2 ), the most common crystalline polymorph of silicon dioxide. Some of the basic open problems in the physics of glassy SiO 2 concern the fundamental absorption edge arising from the electronic transition from the valence to the conduction band.…”

Section: Introductionmentioning

confidence: 99%

Unraveling exciton dynamics in amorphous silicon dioxide: Interpretation of the optical features from 8 to 11 eV

et al. 2011

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We introduce a model comprehensively describing the optical features of amorphous silicon dioxide (a-SiO 2) in the spectral range from ∼8 up to ∼11 eV. Our model is grounded on the critical analysis of the temperature dependence of Kramers-Kronig-derived absorption spectra in the range from ∼8 up to ∼17.5 eV, together with the features of the Urbach absorption tail and of self-trapped exciton emission. In a paper we recently published [Phys. Rev. Lett. 105, 116401 (2010)] we showed the 10.4-eV resonance in the absorption spectra to feature a close Lorentzian line shape, thus implying a delocalized nature for excitons in a-SiO 2. Here we provide estimations of the main parameters ruling exciton dynamics in SiO 2 , such as the energy of the mean lattice vibrational mode coupled to excitons (hω 0 = 0.083 eV), the half width of the excitonic energy band (B ∼ 2 eV), the root-mean-square amplitude of site-to-site energy fluctuations of exciton energy (D ∼ 0.7 eV), and the exciton-phonon coupling constant (g ∼ 2.1). The quantum yield of excitonic emission (η ∼ 10 −3) at T = 10 K in a-SiO 2 is determined as well. Our model suggests that a-SiO 2 features an indirect gap near ∼9 eV and a direct one near ∼11 eV, and allows a coherent description of the properties of the intrinsic Urbach absorption tail. The latter results are satisfactorily explained as arising from the momentary self-trapping of the 10.4-eV exciton. As far as near-edge absorption properties are concerned, our model places SiO 2 in the wider context of wide-band-gap solids, such as LiF or NaF, where excitons are weakly scattered, but strongly coupled to phonons. On the whole, the present study shows that exciton dynamics accounts for all optical properties of a-SiO 2 from ∼8 up to ∼11 eV.

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“…Attempts have been made to study the photo-induced defects not only for silica glass [2,4,6] but also for phosphate and fluorophosphate glasses which are used as optical elements in the ultraviolet region [7][8][9][10]. Consequently, defect formation has been studied by optical spectroscopy, a method which is also useful in assessing the generation rates of defects during the irradiation process.…”

Section: Introductionmentioning

confidence: 99%

Gamma ray irradiation effects on the optical properties of BaO–Na2O–B2O3–SiO2 glasses

Kaur

Singh

Pandey

2013

Journal of Molecular Structure

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Improvement of Vacuum-Ultraviolet Transparency of Silica Glass by Modification of Point Defects(Review)

Cited by 24 publications

References 97 publications

Optical constants of silica glass from extreme ultraviolet to far infrared at near room temperature

Optical constants of silica glass from extreme ultraviolet to far infrared at near room temperature

Unraveling exciton dynamics in amorphous silicon dioxide: Interpretation of the optical features from 8 to 11 eV

Gamma ray irradiation effects on the optical properties of BaO–Na2O–B2O3–SiO2 glasses

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