1-18 of 18
Keywords: fused silica
Close
Follow your search
Access your saved searches in your account

Would you like to receive an alert when new items match your search?
Close Modal
Sort by
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1991
ISBN-10: 0-8194-0532-9
ISBN: 978-0-8194-0532-6
... performed a polishing parameter matrix investigation to optimize fused silica (Corning 7957) surfaces for subsequent ion milling. Samples were characterized for surface scatter, surface absorption, surface roughness, subsurface damage, and laser damage as a function of mill depth. Small defects (pits) were...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1990
ISBN-10: 0-8031-4478-4
ISBN: 978-0-8031-4478-1
.... The detection of laser induced microscopic cracking on nucleation sites within nondestructively identified areas provides additional insight into the progressive development of failure sites in distributed subsurface regions of low RMS, optically finished surfaces. fused silica incipient laser damage...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1988
ISBN-10: 0-8031-4481-4
ISBN: 978-0-8031-4481-1
... The transient radiation-induced absorption in fused silica due to neutron and γ-ray irradiation has been investigated. Transient absorption coefficients at 325 nm have been measured during and after pulsed reactor (TRIGA) irradiation. Radiation-induced absorption results from the generation...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1988
ISBN-10: 0-8031-4481-4
ISBN: 978-0-8031-4481-1
... This paper reports the results of a study to determine the degrading effects of flowing dye solvents on the laser damage threshold of fused-silica windows at 308 nm. Thresholds were measured at the SiO 2 solvent interface in a test cell. Bare SiO 2 tested in air at 308 nm (20 ns) typically...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1988
ISBN-10: 0-8031-4481-4
ISBN: 978-0-8031-4481-1
... of the ion beam figuring process, a study was undertaken to determine the effect of ion milling on the laser damage threshold of fused silica. Fused silica substrates were ion milled to depths up to ten microns using a 1500 eV, 40mA Argon ion beam from a Kaufman ion source. The milled substrates were...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1988
ISBN-10: 0-8031-4479-2
ISBN: 978-0-8031-4479-8
... We report the results of damage studies at 532 nm on BK-7 glass, KCl, fused silica and two grades of crystalline quartz using a frequency doubled, Q-switched YAG laser. This work represents the initial stages of a program to investigate the mechanisms of multiple pulse laser-induced bulk damage...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1988
ISBN-10: 0-8031-4479-2
ISBN: 978-0-8031-4479-8
... We have measured two components in the radiation-induced absorption of 250-nm light in fused silica. For the first, the time constant is 48.3 ± 1.3 ns and the absorption coefficent is 6.68 ± 0.37 cm -1 per Mrad. For the second, the time constant is long compared to 3 μs, and the absorption...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1988
ISBN-10: 0-8031-4477-6
ISBN: 978-0-8031-4477-4
... Optical absorption values of uncoated calcium fluoride and fused silica substrates were measured at 351 nm using the 3-slope laser calorimetry technique. In addition, various substrate cleaning techniques were tried in order to lower the absorption, and to assess the contribution of surface...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1988
ISBN-10: 0-8031-4477-6
ISBN: 978-0-8031-4477-4
... An initial set of experiments has been conducted to determine the practicality of laser processing of optical substrates. In contrast to earlier work, a high average power CO 2 laser was used to flood load the entire surface of each test sample. Fused silica substrates were laser polished...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1988
ISBN-10: 0-8031-4477-6
ISBN: 978-0-8031-4477-4
... The mechanisms responsible for multiple pulse laser damage in transparent solids are still not understood. Recent reports related to laser generation of point defects in fused silica and BK-7 glass raise the possibility that such defect generation is the cause of multiple pulse damage...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1986
ISBN-10: 0-8031-0960-1
ISBN: 978-0-8031-0960-5
... A quarterwave-thick, narrow-bandwidth, antireflective coating for fused silica optical components and KDP crystals has been developed. The coating consists of porous silica prepared from a silica sol in ethanol. It is applied by dip or spin from a solution at room temperature and requires...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1985
ISBN-10: 0-8031-0930-X
ISBN: 978-0-8031-0930-8
... We used 355-nm, 0.6-ns pulses focused to a beam diameter of approximately 1 mm to measure the laser damage thresholds for surfaces of bare polished samples of several types of fused silica, for the bulk of crystals of potassium dihydrogen phosphate (KDP), and for a few plastics. Surface damage...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1985
ISBN-10: 0-8031-0930-X
ISBN: 978-0-8031-0930-8
... In this paper we present bulk damage measurements of crystalline quartz and fused silica under single and multiple pulse irradiation where the wavelength was extended to 0.355 μm. In previous work under irradiation at 1.06 and 0.532 μm, it was shown that whereas the single pulse damage varies...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1985
ISBN-10: 0-8031-0930-X
ISBN: 978-0-8031-0930-8
... Our laser-matter interaction program requires the conversion of our OCTAL laser from 1.06 μm to 0.355 μm. Fused silica is used to realized the focusing lens and the last optics (KDP windows, debris-shield, etc). A damage test facility at 3ωo was build in CEA Limeil in order to compare...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1983
ISBN-10: 0-8031-0708-0
ISBN: 978-0-8031-0708-3
... Flame produced fused silica, the process used by all American manufacturers, contains a large amount of OH − . The fundamental OH − vibration in SiO 2 is at 2.75 μm and its first overtone is at 1.38 μm. Much of the optical absorption at 1.3 μm is due to the wing of the 1.38 μm absorption band...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1981
ISBN-10: 0-8031-0733-1
ISBN: 978-0-8031-0733-5
... Observations of the formation of multiple-mist regions on the fracture surfaces of soda-lime-silicate and fused silica glasses are reported. These regions occur only in high-strength specimens. The same empirical equation that is applicable to the basic fracture mirror-primary mist also...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1979
ISBN-10: 0-8031-0085-X
ISBN: 978-0-8031-0085-5
... when the roughness was <25 Å rms. Careful cleaning increased the damage threshold at 3.2 ns by removing parti culates. BK-7 glass fused silica laser damage polished surfaces pulse duration dependence of damage surface roughness STP689-EB/Dec. 1978 1064 - NMLASERDAMAGETHRESHOLDSOF...
eBook Chapter
Series: ASTM Selected Technical Papers
Publisher: ASTM International
Published: 1974
ISBN-10: 0-8031-0335-2
ISBN: 978-0-8031-0335-1
... parameters into the general statistical formulation of the erosion process. In order to minimize the number of unknown factors in the initial development of a predictive erosion theory, the particular case of spherical glass beads impacting directly on the plane surface of relatively flaw-free fused silica...