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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 37, Iss. 33 — Nov. 20, 1998
  • pp: 7772–7784

Dependence of Birefringence and Residual Stress Near Laser-Induced Cracks in Fused Silica on Laser Fluence and on Laser-Pulse Number

Faiz Dahmani, Ansgar W. Schmid, John C. Lambropoulos, and Stephen Burns  »View Author Affiliations


Applied Optics, Vol. 37, Issue 33, pp. 7772-7784 (1998)
http://dx.doi.org/10.1364/AO.37.007772


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Abstract

Measurements of birefringence induced in fused-silica specimens by a crack produced by a 351-nm/500-ps Nd:glass laser as a function of laser fluence FL and of number of laser shots N are presented. The varying dimensional parameter is found to be the crack depth a and can be put in the form a(mm) = (0.0096 ∓ 0.0021)N[(FL/Fexit/th) − 1]2/3 with FLFexit/th(Fexit/th is the exit-surface damage threshold). The retardance data are converted into units of stress, thus permitting the estimation of residual stress near the crack. The results of the measured residual stress can be cast in the form ςr(MPa) ≈ (. ∓ .)[(FL/Fexit/th) − 1]1/2 N2/3 with FLFexit/th. A theoretical model giving the stress field around a crack is developed for comparison and shows reasonable agreement with the experiment. Good agreement with experimental data of others is also obtained. The effect of residual stresses on fracture strength is pointed out. The results obtained show that the presence of birefringence/residual stress in a fused-silica specimen with a crack on its surface has a strong effect on fracture and should be taken into account in any formulation that involves the failure strength of optical components used in inertial-confinement-fusion experiments.

© 1998 Optical Society of America

OCIS Codes
(140.3330) Lasers and laser optics : Laser damage
(160.4670) Materials : Optical materials
(260.1440) Physical optics : Birefringence
(350.1820) Other areas of optics : Damage
(350.3390) Other areas of optics : Laser materials processing
(350.4600) Other areas of optics : Optical engineering

Citation
Faiz Dahmani, Ansgar W. Schmid, John C. Lambropoulos, and Stephen Burns, "Dependence of Birefringence and Residual Stress Near Laser-Induced Cracks in Fused Silica on Laser Fluence and on Laser-Pulse Number," Appl. Opt. 37, 7772-7784 (1998)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-37-33-7772


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