Abstract

The 351-nm laser-damage initiation threshold for surface damage in conventionally polished fused silica is demonstrated to be stress dependent. By circumferential application of modest loads to a sample, a controllable stress field can be established within the clear aperture of a fused-silica specimen, in response to which both the damage-initiation fluence and the crack-propagation fluence requirements are increased above those for unstressed conditions.

© 1999 Optical Society of America

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References

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  1. F. Dahmani, J. C. Lambropoulos, A. W. Schmid, S. Papernov, and S. J. Burns, J. Mater. Res. 14, 597 (1999).
    [CrossRef]
  2. F. Dahmani, A. W. Schmid, J. C. Lambropoulos, and S. J. Burns, Appl. Opt. 37, 7772 (1998).
    [CrossRef]
  3. ANSYS 5.4 is a finite-element code developed by Ansys, Inc., P.O.??BA65, Johnson Road, Houston, Pa., 15342-0065.
  4. N. Boling, M. Crisp, and G. Dube, Appl. Opt. 12, 650 (1973).
    [CrossRef] [PubMed]
  5. H. Yokota, H. Sakata, M. Nishibori, and K. Kinosita, Surf. Sci. 16, 265 (1969).
    [CrossRef]

1999 (1)

F. Dahmani, J. C. Lambropoulos, A. W. Schmid, S. Papernov, and S. J. Burns, J. Mater. Res. 14, 597 (1999).
[CrossRef]

1998 (1)

1973 (1)

1969 (1)

H. Yokota, H. Sakata, M. Nishibori, and K. Kinosita, Surf. Sci. 16, 265 (1969).
[CrossRef]

Boling, N.

Burns, S. J.

F. Dahmani, J. C. Lambropoulos, A. W. Schmid, S. Papernov, and S. J. Burns, J. Mater. Res. 14, 597 (1999).
[CrossRef]

F. Dahmani, A. W. Schmid, J. C. Lambropoulos, and S. J. Burns, Appl. Opt. 37, 7772 (1998).
[CrossRef]

Crisp, M.

Dahmani, F.

F. Dahmani, J. C. Lambropoulos, A. W. Schmid, S. Papernov, and S. J. Burns, J. Mater. Res. 14, 597 (1999).
[CrossRef]

F. Dahmani, A. W. Schmid, J. C. Lambropoulos, and S. J. Burns, Appl. Opt. 37, 7772 (1998).
[CrossRef]

Dube, G.

Kinosita, K.

H. Yokota, H. Sakata, M. Nishibori, and K. Kinosita, Surf. Sci. 16, 265 (1969).
[CrossRef]

Lambropoulos, J. C.

F. Dahmani, J. C. Lambropoulos, A. W. Schmid, S. Papernov, and S. J. Burns, J. Mater. Res. 14, 597 (1999).
[CrossRef]

F. Dahmani, A. W. Schmid, J. C. Lambropoulos, and S. J. Burns, Appl. Opt. 37, 7772 (1998).
[CrossRef]

Nishibori, M.

H. Yokota, H. Sakata, M. Nishibori, and K. Kinosita, Surf. Sci. 16, 265 (1969).
[CrossRef]

Papernov, S.

F. Dahmani, J. C. Lambropoulos, A. W. Schmid, S. Papernov, and S. J. Burns, J. Mater. Res. 14, 597 (1999).
[CrossRef]

Sakata, H.

H. Yokota, H. Sakata, M. Nishibori, and K. Kinosita, Surf. Sci. 16, 265 (1969).
[CrossRef]

Schmid, A. W.

F. Dahmani, J. C. Lambropoulos, A. W. Schmid, S. Papernov, and S. J. Burns, J. Mater. Res. 14, 597 (1999).
[CrossRef]

F. Dahmani, A. W. Schmid, J. C. Lambropoulos, and S. J. Burns, Appl. Opt. 37, 7772 (1998).
[CrossRef]

Yokota, H.

H. Yokota, H. Sakata, M. Nishibori, and K. Kinosita, Surf. Sci. 16, 265 (1969).
[CrossRef]

Appl. Opt. (2)

J. Mater. Res. (1)

F. Dahmani, J. C. Lambropoulos, A. W. Schmid, S. Papernov, and S. J. Burns, J. Mater. Res. 14, 597 (1999).
[CrossRef]

Surf. Sci. (1)

H. Yokota, H. Sakata, M. Nishibori, and K. Kinosita, Surf. Sci. 16, 265 (1969).
[CrossRef]

Other (1)

ANSYS 5.4 is a finite-element code developed by Ansys, Inc., P.O.??BA65, Johnson Road, Houston, Pa., 15342-0065.

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Figures (5)

Fig. 1
Fig. 1

Experimental arrangement for applying compressive loads to fused-silica surfaces by clamping of the conventionally polished sample between aluminum plates. The static pressure applied is measured by the load cell. Sample dimensions are length L, width w, and thickness t oriented relative to the Cartesian coordinate system as indicated.

Fig. 2
Fig. 2

Entrance- and exit-surface 351-nm damage-initiation thresholds as functions of applied stress follow similar trends.

Fig. 3
Fig. 3

Cross-sectional micrographs of laser-induced cracks after 270 exposures to constant fluences FL=2.1Fexit/thr in a sample (a) free of external stress and (b) with σzz=-6 psi. The crack tip in (a) is, for the given magnification, already located outside the field of view.

Fig. 4
Fig. 4

Crack length as a function of applied external stress for identical irradiation conditions as in Fig.  3.

Fig. 5
Fig. 5

Comparison between the hoop stress2 (for σr=-145 psi, c=0.49 mm) and the stress σzz from the analyti-cal model for an applied pressure p=35 psi at z=1.5 mm from the sample center. It is clearly seen that applying an external load diminishes the hoop-stress magnitude.

Equations (3)

Equations on this page are rendered with MathJax. Learn more.

y=±t/2,σyy=p,-c<z<c0,-w/2<z<-c;c<z<w/2,σyz=0,
z=±w/2,σzz=0σyz=0.
ϕy,z=ncosαnzAnchαny+Bnαnyshαny+B0z2,

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