New method of photochemical adhesion of fused silica glasses by using Xe2 excimer lamp

ABSTRACTA strong adhesion of two silica glasses or a silica glass and a different glass that creates properties of heatproof, no adhesive strain, and high transmittance in the region of ultraviolet [UV] was demonstrated with photochemical reaction by vacuum-ultraviolet [V-UV] light. It was confirmed that the adhesive strength of the silicone oil between the two silica glasses enhanced to 18 [MPa] after irradiation from 0 [MPa] before irradiation, that of the SiO2 and BK7 to 12.3 [MPa], and that of the SiO2 and TEMPAX®, to 10 [MPa], and that of the SiO2 and CLEARCERAM® to 7.4 [MPa]. Furthermore, the adhesive strain of the bonded sample was measured by 3-dimension roughness meter (ZYGO), and the results showed no adhesive strain. This sample had the bonding strength at 500 degrees Celsius.

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Photochemical Bonding of Fluorocarbon and Fused Silica Glass for Ultraviolet Ray Transmitting

MRS Proceedings ◽

10.1557/proc-796-v3.7 ◽

2003 ◽

Vol 796 ◽

Cited By ~ 2

Author(s):

Kenji Asano ◽

Masataka Murahara

Keyword(s):

Tensile Strength ◽

Silica Glass ◽

Silicone Oil ◽

Unsaturated Polyester ◽

Fused Silica ◽

Strong Absorption Band ◽

Excimer Lamp ◽

Silicon Oil ◽

Fused Silica Glass ◽

Uv Rays

ABSTRACTFluorocarbon was photo-chemically combined to a fused silica glass with the silicon oil used as a bonding agent. Balsam, unsaturated polyester resins and UV hardening adhesives have been generally used for joining two optical glasses together. They, however, have a strong absorption band in the UV region. Therefore, a new bonding method was developed for optical materials to allow UV rays to pass through using silicone oil and excimer- lamp. This new method requires the fluorocarbon-polishing pad employed in our PCP (Photo-Chemical Polishing) method in hydrofluoric acid ambience, which is bonded with the silica glass. The silicone oil was put between the fused silica glass and the fluorocarbon (FEP), and an excimer- lamp was irradiated. When the excimer lamplight was irradiated vertically, the silicon oil ((-O-Si(CH3)-O-)n) was photo-dissociated and reacted with the oxygen adsorbed on the silica glass surface to produce a SiO2. On the other hand, the H atoms photo-dissociated from the silicon oil pulled out the F atoms of the FEP. As a result, the FEP and the silica glass were combined. The tensile strength of the sample bonded by the photo-chemical reaction was evaluated. The tensile strength of 5.4 [kgf/cm2] was obtained, whereas that of the non-treatment sample was nil. Moreover, the transmittance of the vitrified silicone oil was measured at the 193 nm of ArF laser wavelength. It increased by 90.6% from 29.2% without the UV photon irradiation. The results showed that the silicon oil changed to silica glass by the excited oxygen, which improved the UV rays under 200nm transmittance.

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Photochemical Adhesion of Fused Silica Glass Lens by Silicone Oil

MRS Proceedings ◽

10.1557/proc-843-t3.15 ◽

2004 ◽

Vol 843 ◽

Author(s):

Takayuki Funatsu ◽

Masanori Kobayashi ◽

Yoshiaki Okamoto ◽

Masataka Murahara

Keyword(s):

Silica Glass ◽

Silicone Oil ◽

Fused Silica ◽

Oxygen Atmosphere ◽

Side Chain ◽

Dimethyl Siloxane ◽

Before And After ◽

Glass Lens ◽

Uv Transmittance ◽

Fused Silica Glass

ABSTRACTThe optical system that is pervious to ultraviolet light of 200nm and under in the wavelength has been developed by putting one silica glass to another with the silicone oil photo-oxidized in oxygen atmosphere.Quartz has siloxane bonds, while silicone oil (dimethyl siloxane) is composed of siloxane bonds of the main chain and methyl groups of the side chain. Therefore, the organic silicone oil has been photo-oxidized by irradiating UV rays in oxygen atmosphere to change into inorganic glass. That is, the silicone oil was poured into the thin gap between the two pieces of silica glass in oxygen atmosphere and was irradiated with the Xe2 excimer lamp while heating at temperature above 150°C. Consequently, the siloxane of the silicone oil was linked with the O atoms that had been absorbed on the glass surface to form SiO2.The UV and IR spectrum analysis was conducted on the silicone oil before and after lamp irradiation. The results revealed that as the time of lamp irradiation increased, the absorption peak of the CH3 group in the region of 2960 cm−1 decreased but the transmittance of the light in the 190nm wavelength conversely became high. The UV transmittance of the silicone oil was 50% before the lamp irradiation; which improved to 87% after the irradiation for 60 minutes. Furthermore, the tensile strength of the bonded sample was measured. It confirmed that the adhesive strength of the silicone oil was enhanced from 0 kgf/cm2 of before-irradiation to 180 kgf/cm2 of after- irradiation.

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VUV photon induced strain free amorphous silica coating with hard protective waterproof property for high power laser optics

MRS Proceedings ◽

10.1557/opl.2013.91 ◽

2013 ◽

Vol 1520 ◽

Author(s):

Yuji Sato ◽

Shinji Motokoshi ◽

Masahiro Nakatsuka ◽

Yoshiaki Okamoto ◽

Masataka Murahara

Keyword(s):

Thin Film ◽

Amorphous Silica ◽

Silica Glass ◽

Silicone Oil ◽

Silica Coating ◽

Silica Film ◽

Fused Silica ◽

Power Laser ◽

Kdp Crystal ◽

Fused Silica Glass

ABSTRACTAn amorphous silica film has been coated on a fused silica glass and KH2PO4 [KDP] crystal by using the photo oxidization of Dimethy-siloxane silicone [DMSS] oil by using a xenon [Xe2] excimer lamp at room temperature. The DMSS oil [-O-Si[CH3]2-O-]n was spin-coated on a fused silica glass to make a thin film, and the Xe2 lamp light was vertically irradiated in the presence of oxygen. Thus, the organic oil was changed into inorganic glass. In order to investigate the photochemical reaction process, the fluorescence intensity was measured by spectrometer at actual time and the new method to form a transparent, photo-oxidized thin film efficiently has been established. The interferometer analysis was conducted to investigate the strain of the coating samples. It became clear that the no strain were caused by vitrification of the silicone oil on the fused silica galass with Xe2 lamp irradiation.

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Variation of Transparency of Zeolite-Derived Silica Glass Prepared by Spark Plasma Sintering

Materials Science Forum ◽

10.4028/www.scientific.net/msf.848.305 ◽

2016 ◽

Vol 848 ◽

pp. 305-311

Author(s):

Shi Jia Gu ◽

Lian Jun Wang ◽

Wan Jiang ◽

Wei Luo

Keyword(s):

Spark Plasma Sintering ◽

Raman Spectra ◽

Silica Glass ◽

Sintering Temperature ◽

Transition Process ◽

Fused Silica ◽

Silica Glasses ◽

Plasma Sintering ◽

Spark Plasma ◽

Fused Silica Glass

A series of zeolite-derived silica glasses have been fabricated through the order-disorder transition process of zeolites using spark plasma sintering (SPS). The samples were characterized by UV-VIS-NIR transmittance, Raman spectra and Vicker’s hardness. Results showed that the transmittance of zeolite-derived silica glass samples increased with the sintering temperature increasing. The transmittance of the sample prepared at 1300°C was lower than 5%. The highly transparent samples could be obtained when the sintering temperature was above 1350°C. The transmittance of these samples was higher than 80% in the range of 780~1700nm and 60% in the UV-vis range of 250~780nm. One absorption band at 300nm can also be observed in the spectrum. The reason of this phenomenon could be ascribed to a few left crystallite fragments of ZSM-5. The Raman spectra showed that the bands at 378 and 292cm-1of ZSM-5 were significantly weakened and then disappeared with increasing the sintering temperature and the bands at 489 and 600cm-1 of silica glass became more apparent. The Raman spectra of the samples obtained above 1350°C were the same as that of the fused silica glass. The Vicker’s hardness of as-prepared samples increased with the rising of the sintering temperature. The maximum hardness of 7.31 GPa was achieved for the sample sintered at 1400°C. The fracture toughness of samples increased from 0.83 MPa·m1/2 to 2.37 MPa·m1/2 with the sintering temperature increasing.

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Photocatalytic Discolouration of Solutions of Reactive Dyes in the Presence of H2O2

Water Quality Research Journal ◽

10.2166/wqrj.1995.009 ◽

1995 ◽

Vol 30 (1) ◽

pp. 53-60 ◽

Cited By ~ 1

Author(s):

Deng Nansheng ◽

Tian Shizhong ◽

Xia Mei

Keyword(s):

Photochemical Reaction ◽

Uv Light ◽

Reactive Dyes ◽

Solar Light ◽

Rate Equations ◽

Oh Radical ◽

Test Results ◽

Dye Molecules ◽

First Order ◽

Dye Solutions

Abstract Tests for the photocatalytic degradation of solutions of three reactive dyes, Red M-5B, Procion Blue MX-R and Procion Black H-N, in the presence of H2O2 were carried out. When the solutions of the three reactive dyes were irradiated by UV or solar light, the colour of the solutions disappeared gradually. A statistical analysis of the test results indicated a linear relation between the concentration of dyes and the time of irradiation. The discolouration reaction of the solutions was of the first order. Rate equations for the discolouration reactions of dye solutions were developed. The dark reactions or the dye solutions containing H2O2 were very slow, illustrating that the photochemical reaction played a very important role. It was demonstrated that UV light and solar light (300 to 380 nm) photolyzes the HO and that the resulting OH radical reacts with the dye molecules and destroys the chromophore.

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Terahertz and Microwave Optical Properties of Single-Crystal Quartz and Vitreous Silica and the Behavior of the Boson Peak

Applied Sciences ◽

10.3390/app11156733 ◽

2021 ◽

Vol 11 (15) ◽

pp. 6733

Author(s):

Mira Naftaly ◽

Andrew Gregory

Keyword(s):

Single Crystal ◽

Silica Glass ◽

Broad Band ◽

Peak Frequency ◽

Vitreous Silica ◽

Peak Height ◽

Fused Silica ◽

Boson Peak ◽

Single Crystal Quartz ◽

Crystal Quartz

Z-cut single-crystal quartz and vitreous silica (silica glass or fused silica) were evaluated for use as reference materials for terahertz and microwave measurements of complex permittivity, with Z-cut quartz confirmed as being suitable. Measurements of refractive indices and absorption coefficients for o-ray and e-ray in quartz and for vitreous silica are reported at frequencies between 0.2 and 6 THz and at 36 and 144 GHz, and compared with data reported in the literature. A previously unreported broad band was seen in the extraordinary absorption of quartz. The Boson peak in silica glass absorption was examined, and for the first time, two negative relationships have been observed: between the refractive index and the Boson peak frequency, and between the Boson peak height and its frequency.

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Mechanical Properties of SiO2 vs. SiO2-TiO2 Bulk Glasses and Fibers

MRS Proceedings ◽

10.1557/proc-244-67 ◽

1991 ◽

Vol 244 ◽

Cited By ~ 5

Author(s):

Suresh T. Gulati

Keyword(s):

Mechanical Properties ◽

Optical Fibers ◽

Mechanical Performance ◽

Fatigue Behavior ◽

Deformation Mode ◽

Strength Distribution ◽

Fused Silica ◽

Space Applications ◽

Silica Glasses ◽

Silica And Titania

ABSTRACTThe mechanical properties of silica and titania-doped silica glasses, in bulk and fiber forms, are presented. These include the elastic properties (E and ν), strength distribution (in tension and bending), fatigue behavior (dynamic and static loading) and fracture toughness. Following a brief review of above properties for fused silica and ULE™ glasses (Coming Codes 7940 and 7971), used primarily for space applications, the mechanical properties data for silica and titania-doped silica-clad optical fibers are presented. The enhancement of mechanical performance of titania-doped silica clad fiber is also discussed.The effect of titania doping on fundamental properties like stress-free activation energy, crack tip pH, and deformation mode of Si-O-Si bond is discussed. In addition, the crack velocity data obtained from DCDC specimens of homogeneous silica and titania-doped silica glasses are compared in an attempt to understand the role titania plays in improving the fatigue resistance of optical fibers.

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Spectral Properties of Spatially and Spectrally Partially Coherent Pulsed Beams in Fused-Silica Glass Medium

Materials Science Forum ◽

10.4028/www.scientific.net/msf.663-665.108 ◽

2010 ◽

Vol 663-665 ◽

pp. 108-112

Author(s):

Chao Liang Ding ◽

Min Teng ◽

Zhi Guo Zhao ◽

Liu Zhan Pan

Keyword(s):

Spatial Correlation ◽

Correlation Length ◽

Silica Glass ◽

Coherence Length ◽

Spectral Properties ◽

Spectral Shift ◽

Fused Silica ◽

Partially Coherent ◽

Spatial Correlation Length ◽

Fused Silica Glass

Using the coherence theory of non-stationary fields and the method of Fourier transform, the spectral properties of spatially and spectrally partially coherent Gaussian Schell-model pulsed (GSMP) beams in fused-silica glass medium are studied and analyzed numerically. It is shown that the spectral shift takes place, which depends on the position of the field point, spatial correlation length, temporal coherence length and dispersive property of medium, as GSMP beams propagate in fused-silica glass medium. The on-axis spectrum is blue-shifted, and the relative spectral shift increases with increasing propagation distance, and decreases as the spatial correlation length and temporal coherence length increases, and then approaches an asymptotic value. The dispersive property of medium plays an important role in the spectral properties of spatially and spectrally partially coherent beams.

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