Abstract

Mechanically polished fused silica surfaces were heated with continuous-wave CO2 laser radiation. Laser-damage thresholds of the surfaces were measured with 1064-nm 9-nsec pulses focused to small spots and with large-spot, 1064-nm, 1-nsec irradiation. A sharp transition from laser-damage-prone to highly laser-damage-resistant took place over a small range in CO2 laser power. The transition to high damage resistance occurred at a silica surface temperature where material softening began to take place as evidenced by the onset of residual strain in the CO2 laser-processed part. The small-spot damage measurements show that some CO2 laser-treated surfaces have a local damage threshold as high as the bulk damage threshold of SiO2. On some CO2 laser-treated surfaces, large-spot damage thresholds were increased by a factor of 3–4 over thresholds of the original mechanically polished surface. These treated parts show no obvious change in surface appearance as seen in bright-field, Nomarski, or total internal reflection microscopy. They also show little change in transmissive figure. Further, antireflection films deposited on CO2 laser-treated surfaces have thresholds greater than the thresholds of antireflection films on mechanically polished surfaces.

© 1982 Optical Society of America

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  1. P. A. Temple, D. Milam, W. H. Lowdermilk, “CO2-laser polishing of fused silica surfaces for increased laser damage resistance at 1.06 μm,” Natl. Bur. Stand. (U.S.) Spec. Publ. 568 (1979), p. 229.
  2. P. A. Temple, M. J. Soileau, “1.06 μm laser-induced breakdown of CO2-laser-polished fused SiO2,” Natl. Bur. Stand. (U.S.) Spec. Publ. 620 (1980), p. 180.
  3. P. A. Temple, Appl. Opt. 20, 2656 (1981).
    [CrossRef] [PubMed]
  4. J. Swain, Lawrence Livermore National Laboratory; private communication.
  5. R. B. Sosman, The Phase of Silica (Rutgers U. Press, N.J., 1965), p. 52, “The first effect of high temperature on pure silica, whether in the form of crystalline quartz or vitreous silica, is to produce cristobalite.”

1981

1980

P. A. Temple, M. J. Soileau, “1.06 μm laser-induced breakdown of CO2-laser-polished fused SiO2,” Natl. Bur. Stand. (U.S.) Spec. Publ. 620 (1980), p. 180.

1979

P. A. Temple, D. Milam, W. H. Lowdermilk, “CO2-laser polishing of fused silica surfaces for increased laser damage resistance at 1.06 μm,” Natl. Bur. Stand. (U.S.) Spec. Publ. 568 (1979), p. 229.

Lowdermilk, W. H.

P. A. Temple, D. Milam, W. H. Lowdermilk, “CO2-laser polishing of fused silica surfaces for increased laser damage resistance at 1.06 μm,” Natl. Bur. Stand. (U.S.) Spec. Publ. 568 (1979), p. 229.

Milam, D.

P. A. Temple, D. Milam, W. H. Lowdermilk, “CO2-laser polishing of fused silica surfaces for increased laser damage resistance at 1.06 μm,” Natl. Bur. Stand. (U.S.) Spec. Publ. 568 (1979), p. 229.

Soileau, M. J.

P. A. Temple, M. J. Soileau, “1.06 μm laser-induced breakdown of CO2-laser-polished fused SiO2,” Natl. Bur. Stand. (U.S.) Spec. Publ. 620 (1980), p. 180.

Sosman, R. B.

R. B. Sosman, The Phase of Silica (Rutgers U. Press, N.J., 1965), p. 52, “The first effect of high temperature on pure silica, whether in the form of crystalline quartz or vitreous silica, is to produce cristobalite.”

Swain, J.

J. Swain, Lawrence Livermore National Laboratory; private communication.

Temple, P. A.

P. A. Temple, Appl. Opt. 20, 2656 (1981).
[CrossRef] [PubMed]

P. A. Temple, M. J. Soileau, “1.06 μm laser-induced breakdown of CO2-laser-polished fused SiO2,” Natl. Bur. Stand. (U.S.) Spec. Publ. 620 (1980), p. 180.

P. A. Temple, D. Milam, W. H. Lowdermilk, “CO2-laser polishing of fused silica surfaces for increased laser damage resistance at 1.06 μm,” Natl. Bur. Stand. (U.S.) Spec. Publ. 568 (1979), p. 229.

Appl. Opt.

Natl. Bur. Stand. (U.S.) Spec. Publ. 568

P. A. Temple, D. Milam, W. H. Lowdermilk, “CO2-laser polishing of fused silica surfaces for increased laser damage resistance at 1.06 μm,” Natl. Bur. Stand. (U.S.) Spec. Publ. 568 (1979), p. 229.

Natl. Bur. Stand. (U.S.) Spec. Publ. 620

P. A. Temple, M. J. Soileau, “1.06 μm laser-induced breakdown of CO2-laser-polished fused SiO2,” Natl. Bur. Stand. (U.S.) Spec. Publ. 620 (1980), p. 180.

Other

J. Swain, Lawrence Livermore National Laboratory; private communication.

R. B. Sosman, The Phase of Silica (Rutgers U. Press, N.J., 1965), p. 52, “The first effect of high temperature on pure silica, whether in the form of crystalline quartz or vitreous silica, is to produce cristobalite.”

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