Multi-impurities induced crystallization for fused silica glasses upon heating by contact with the corundum plate

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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Dielectric Properties of Sol - Gel Silica Glasses

MRS Proceedings ◽

10.1557/proc-72-309 ◽

1986 ◽

Vol 72 ◽

Cited By ~ 2

Author(s):

G. V. Chandrashekhar ◽

M. W. Shafer

Keyword(s):

Dielectric Constant ◽

Dielectric Properties ◽

Elemental Carbon ◽

Sol Gel ◽

Fused Silica ◽

Dielectric Constants ◽

Low Dielectric Constant ◽

Silica Glasses ◽

Low Dielectric ◽

Gel Technique

AbstractDielectric properties have been measured for a series of porous and fully densified silica glasses, prepared by the sol-gel technique starting from Si-methoxide or Si-fume. The results for the partially densified glasses do not show any preferred orientation for porosity. When fully densified (˜2.25 gms/cc) without any prior treatment of the gels, they have dielectric constants of ≥ 6.5 and loss factors of 0.002 at 1 MHz, compared to values of 3.8 and <0.001 for commercial fused silica. There is no corresponding anomaly in the d.c. resistivity. Elemental carbon present to the extent of 400–500 ppm is likely to be the main cause for this enhanced dielectric constant. Extensive cleaning of the gels prior to densification to remove this carbon were not completely successful pointing to the difficulty in preparing high purity, low dielectric constant glasses via the organic sol-gel route at least in the bulk form.

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

MRS Proceedings ◽

10.1557/proc-1054-ff05-31 ◽

2007 ◽

Vol 1054 ◽

Author(s):

Takayuki Funatsu ◽

Yuji Sato ◽

Yoshiaki Okamoto ◽

Masataka Murahara

Keyword(s):

Adhesive Strength ◽

Silica Glass ◽

Bonding Strength ◽

Photochemical Reaction ◽

Vacuum Ultraviolet ◽

Silicone Oil ◽

Uv Light ◽

Fused Silica ◽

Silica Glasses ◽

Strong Adhesion

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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Stress Induced Extended Ranges for Hydration and Other Phenomena in Ion Implanted Silica Glasses

MRS Proceedings ◽

10.1557/proc-438-689 ◽

1996 ◽

Vol 438 ◽

Cited By ~ 1

Author(s):

G. W. Arnold ◽

G. Battaglin

Keyword(s):

Stress Corrosion ◽

Water Immersion ◽

Soda Lime ◽

Fused Silica ◽

Soda Lime Glass ◽

Ambient Atmosphere ◽

Near Surface ◽

Silica Glasses ◽

Property Changes ◽

Ion Implanted

AbstractThe extended ranges (2–3 times theoretical) for hydration from an ambient atmosphere or water immersion and other anomalous ranges for property changes in ion-implanted fused silica are explained on the basis of a stress corrosion model (Michalske-Bunker). The results for the hydration of implanted soda-lime glass are similar to fused silica with the added feature of compositional modification due to the near-surface removal of alkali.

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Control of the refractive index change in fused silica glasses induced by a loosely focused femtosecond laser

Applied Physics A ◽

10.1007/s00339-003-2158-9 ◽

2004 ◽

Vol 78 (1) ◽

pp. 85-88 ◽

Cited By ~ 21

Author(s):

M. Kamata ◽

M. Obara

Keyword(s):

Refractive Index ◽

Femtosecond Laser ◽

Refractive Index Change ◽

Fused Silica ◽

Index Change ◽

Silica Glasses

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Optimization of repetition rate, pulse duration, and polarization for femtosecond-laser-writing of waveguides in borosilicate and fused silica glasses

2007 European Conference on Lasers and Electro-Optics and the International Quantum Electronics Conference ◽

10.1109/cleoe-iqec.2007.4386208 ◽

2007 ◽

Author(s):

S. M. Eaton ◽

H. Zhang ◽

M. L. Ng ◽

S. Ho ◽

P. R. Herman

Keyword(s):

Femtosecond Laser ◽

Pulse Duration ◽

Repetition Rate ◽

Fused Silica ◽

Laser Writing ◽

Silica Glasses

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STUDY ON THE OPTICAL SECOND-ORDER NONLINEARITY OF SUBMICROSPHERICAL SILICA GLASS

Journal of Nonlinear Optical Physics & Materials ◽

10.1142/s0218863505002566 ◽

2005 ◽

Vol 14 (01) ◽

pp. 93-106 ◽

Cited By ~ 1

Author(s):

Y. Q. LUE ◽

T. K. HO ◽

C. P. PANG ◽

J. T. LUE

Keyword(s):

Second Harmonic ◽

Sol Gel ◽

Fused Silica ◽

X Ray Diffraction ◽

Thin Glass ◽

Thermal Poling ◽

Damage Level ◽

Silica Glasses ◽

Close Packed Structure ◽

Packed Structure

Undoped and Ce-doped silica submicrospheres are prepared by using the sol-gel method. The gel-like glass becomes thin glass plates by means of heat drying and densification. The nanospheres with diameters between 200 to 300 nm are sediment to an ordered layer of close-packed structure. Before measuring the optical second harmonic generation (SHG), samples are processed either by laser poling or thermal poling. Compared with fused silica glasses, the sample has a lower laser damage level. The submicrospheres inhibit from SHG for its centrosymmetric structure. Samples subjected to thermal poling at a temperature of 1050°C under a bias of 5kV for four days reveal an illustrious SHG. The X-ray diffraction pattern indicates an alternation of structure from nanocrystalline to amorphous, then to a close-packed cluster of SiO2 nanospheres as the thermal annealing temperature increases from 800 to 1050°C.

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