Abstract

Single layer coatings of Al2O3·H2O have been prepared on fused silica and BK-7 substrates from aqueous colloidal suspensions of hydrated alumina at room temperature. These coatings were porous and had a refractive index of ∼1.44. Multilayer, high reflectivity, dielectric coatings were also prepared by laying down quarterwave-thick, alternating coats of this alumina with silica, also prepared from colloidal suspension, and having a refractive index of 1.22. To achieve 99% reflectivity, 30–35 layers were required. Single shot, laser damage threshold measurements at 1064 nm wavelength with a pulse length of 10 ns were carried out on both the single layer and multilayer system. The thresholds averaged 21 and 12 J/cm2, respectively.

© 1989 Optical Society of America

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References

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  1. I. M. Thomas, “High Laser Threshold Damage Porous Silica Antireflective Coating,” Appl. Opt. 25, 1481–1483 (1986).
    [CrossRef] [PubMed]
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    [CrossRef] [PubMed]
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    [CrossRef] [PubMed]
  4. R. S. Sokolova, “Internal Stresses in Thin Oxide Films Deposited from Hydrolysable Solutions,” Sov. J. Opt. Technol. 41, 15– 17 (1974).
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    [CrossRef]
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    [CrossRef]
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    [CrossRef]
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    [CrossRef]
  11. B. E. Yoldas, “Alumina Sol Preparation from Alkoxides,” Am. Chem. Soc. Bull. 54, 289–290 (1975).
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    [CrossRef] [PubMed]
  13. J. H. Gladstone, A. Tribe, J. Chem. Soc. 39, 4–16 (1881).
  14. H. K. Pulker, Coatings on Glass (American Elsevier, New York1984), p. 114–115.
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    [CrossRef]
  16. I. M. Thomas, J. Wilder, A. Lee, D. George, “Influence of Post-Deposition Treatment by UV Light and Oxygen (Ozone) on 350-nm Damage Thresholds of SiO2 Films Deposited from Sols,” Boulder Damage Symposium, Boulder, CO, Oct. 1986.

1988 (1)

1987 (2)

1986 (1)

1980 (1)

1978 (2)

D. M. Mattox, “Surface Cleaning in Thin Film Technology,” Thin Solid Films 53, 81–96 (1978).
[CrossRef]

W. B. Scott, E. Matijevic, “Aluminum Hydrous Oxide Sols III. Preparation of Uniform Particles by Hydrolysis of Aluminum Chloride and Perchlorate Salts,” J. Colloid. Interface Sci. 66, 447–454 (1978).
[CrossRef]

1975 (1)

B. E. Yoldas, “Alumina Sol Preparation from Alkoxides,” Am. Chem. Soc. Bull. 54, 289–290 (1975).

1974 (1)

R. S. Sokolova, “Internal Stresses in Thin Oxide Films Deposited from Hydrolysable Solutions,” Sov. J. Opt. Technol. 41, 15– 17 (1974).

1961 (1)

J. Bugosh, “Colloidal Alumina—The Chemistry and Morphology of Colloidal Boehmite,” J. Phys. Chem. 65, 1789–1793 (1961).
[CrossRef]

1942 (1)

H. Bassett, R. G. Durrant, “Equilibria and Changes in Metal Hydroxide Sols,” J. Chem. Soc., 277–303 (1942).
[CrossRef]

1881 (1)

J. H. Gladstone, A. Tribe, J. Chem. Soc. 39, 4–16 (1881).

Bassett, H.

H. Bassett, R. G. Durrant, “Equilibria and Changes in Metal Hydroxide Sols,” J. Chem. Soc., 277–303 (1942).
[CrossRef]

Bilan, B. S.

Bond, S.

Bugosh, J.

J. Bugosh, “Colloidal Alumina—The Chemistry and Morphology of Colloidal Boehmite,” J. Phys. Chem. 65, 1789–1793 (1961).
[CrossRef]

Durrant, R. G.

H. Bassett, R. G. Durrant, “Equilibria and Changes in Metal Hydroxide Sols,” J. Chem. Soc., 277–303 (1942).
[CrossRef]

Evans, D.

George, D.

I. M. Thomas, J. Wilder, A. Lee, D. George, “Influence of Post-Deposition Treatment by UV Light and Oxygen (Ozone) on 350-nm Damage Thresholds of SiO2 Films Deposited from Sols,” Boulder Damage Symposium, Boulder, CO, Oct. 1986.

Gladstone, J. H.

J. H. Gladstone, A. Tribe, J. Chem. Soc. 39, 4–16 (1881).

Lane, E. S.

E. S. Lane, “Preparation of Sols and Gels,” U.K. Patent2,111,966 (13July1983).

Langridge, J. U. D.

Lee, A.

I. M. Thomas, J. Wilder, A. Lee, D. George, “Influence of Post-Deposition Treatment by UV Light and Oxygen (Ozone) on 350-nm Damage Thresholds of SiO2 Films Deposited from Sols,” Boulder Damage Symposium, Boulder, CO, Oct. 1986.

Matijevic, E.

W. B. Scott, E. Matijevic, “Aluminum Hydrous Oxide Sols III. Preparation of Uniform Particles by Hydrolysis of Aluminum Chloride and Perchlorate Salts,” J. Colloid. Interface Sci. 66, 447–454 (1978).
[CrossRef]

Mattox, D. M.

D. M. Mattox, “Surface Cleaning in Thin Film Technology,” Thin Solid Films 53, 81–96 (1978).
[CrossRef]

O'Neill, F.

Pulker, H. K.

H. K. Pulker, Coatings on Glass (American Elsevier, New York1984), p. 114–115.

Ross, I. N.

Ryznar, J. W.

J. W. Ryznar, “Production of Aqueous Sols of Hydrous Oxides,” U.S. Patent2,438,230 (23Mar.1948).

Scott, W. B.

W. B. Scott, E. Matijevic, “Aluminum Hydrous Oxide Sols III. Preparation of Uniform Particles by Hydrolysis of Aluminum Chloride and Perchlorate Salts,” J. Colloid. Interface Sci. 66, 447–454 (1978).
[CrossRef]

Sokolova, R. S.

R. S. Sokolova, “Internal Stresses in Thin Oxide Films Deposited from Hydrolysable Solutions,” Sov. J. Opt. Technol. 41, 15– 17 (1974).

Thomas, I. M.

Tribe, A.

J. H. Gladstone, A. Tribe, J. Chem. Soc. 39, 4–16 (1881).

Wilder, J.

I. M. Thomas, J. Wilder, A. Lee, D. George, “Influence of Post-Deposition Treatment by UV Light and Oxygen (Ozone) on 350-nm Damage Thresholds of SiO2 Films Deposited from Sols,” Boulder Damage Symposium, Boulder, CO, Oct. 1986.

Yoldas, B. E.

B. E. Yoldas, “Investigations of Porous Oxides as an antireflecting Coating for Glass Surfaces,” Appl. Opt. 19, 1425–1429 (1980).
[CrossRef] [PubMed]

B. E. Yoldas, “Alumina Sol Preparation from Alkoxides,” Am. Chem. Soc. Bull. 54, 289–290 (1975).

Am. Chem. Soc. Bull. (1)

B. E. Yoldas, “Alumina Sol Preparation from Alkoxides,” Am. Chem. Soc. Bull. 54, 289–290 (1975).

Appl. Opt. (5)

J. Chem. Soc. (2)

H. Bassett, R. G. Durrant, “Equilibria and Changes in Metal Hydroxide Sols,” J. Chem. Soc., 277–303 (1942).
[CrossRef]

J. H. Gladstone, A. Tribe, J. Chem. Soc. 39, 4–16 (1881).

J. Colloid. Interface Sci. (1)

W. B. Scott, E. Matijevic, “Aluminum Hydrous Oxide Sols III. Preparation of Uniform Particles by Hydrolysis of Aluminum Chloride and Perchlorate Salts,” J. Colloid. Interface Sci. 66, 447–454 (1978).
[CrossRef]

J. Phys. Chem. (1)

J. Bugosh, “Colloidal Alumina—The Chemistry and Morphology of Colloidal Boehmite,” J. Phys. Chem. 65, 1789–1793 (1961).
[CrossRef]

Sov. J. Opt. Technol. (1)

R. S. Sokolova, “Internal Stresses in Thin Oxide Films Deposited from Hydrolysable Solutions,” Sov. J. Opt. Technol. 41, 15– 17 (1974).

Thin Solid Films (1)

D. M. Mattox, “Surface Cleaning in Thin Film Technology,” Thin Solid Films 53, 81–96 (1978).
[CrossRef]

Other (4)

I. M. Thomas, J. Wilder, A. Lee, D. George, “Influence of Post-Deposition Treatment by UV Light and Oxygen (Ozone) on 350-nm Damage Thresholds of SiO2 Films Deposited from Sols,” Boulder Damage Symposium, Boulder, CO, Oct. 1986.

H. K. Pulker, Coatings on Glass (American Elsevier, New York1984), p. 114–115.

J. W. Ryznar, “Production of Aqueous Sols of Hydrous Oxides,” U.S. Patent2,438,230 (23Mar.1948).

E. S. Lane, “Preparation of Sols and Gels,” U.K. Patent2,111,966 (13July1983).

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Figures (2)

Fig. 1
Fig. 1

Transmission of Al2O3·H2O coating on BK-7 substrate.

Fig. 2
Fig. 2

Damage thresholds of Al2O3-SiO2 coatings.

Equations (1)

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2 Al ( OR ) 3 + 4 H 2 O Al 2 O 3 H 2 O + 6 ROH .

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