Photochemical Adhesion of Fused Silica Glass Lens by Silicone Oil

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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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 for UV transmittance

10.1117/12.588385 ◽

2005 ◽

Cited By ~ 3

Author(s):

Masataka M. Murahara ◽

Takayuki Funatsu ◽

Yoshiaki Okamoto

Keyword(s):

Silica Glass ◽

Fused Silica ◽

Uv Transmittance ◽

Fused Silica Glass

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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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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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