Abstract

Further studies have been made on the preparation of LiF-overcoated aluminum mirrors with highest reflectance at wavelengths down to 1000 Å. Mirrors with 73% reflectance at λ = 1026 Å have been made. The extinction coefficient k of evaporated LiF films has been measured under various conditions of film preparation. Techniques for vacuum depositing LiF films with the smallest k and Al + LiF mirrors with the highest reflectance are described. Aging of LiF-coated Al mirrors under various conditions is discussed.

© 1968 Optical Society of America

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References

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  1. R. P. Madden, L. R. Canfield, G. Hass, J. Opt. Soc. Amer. 53, 620 (1963).
    [CrossRef]
  2. G. Hass, R. Tousey, J. Opt. Soc. Amer. 49, 593 (1959).
    [CrossRef]
  3. P. H. Berning, G. Hass, R. P. Madden, J. Opt. Soc. Amer. 50, 586 (1960).
    [CrossRef]
  4. L. R. Canfield, G. Hass, J. E. Waylonis, Appl. Opt. 5, 45 (1966).
    [CrossRef] [PubMed]
  5. D. W. Angel, W. R. Hunter, R. Tousey, G. Hass, J. Opt. Soc. Amer. 51, 913 (1961).
    [CrossRef]
  6. G. Hass, W. R. Hunter, R. Tousey, J. Opt. Soc. Amer. 46, 1009 (1965); J. Opt. Soc. Amer. 47, 1070 (1957).
  7. H. Harting, Sitzber, Deut. Akad. Wiss. Berlin 4, 3 (1948).
  8. R. P. Madden, L. R. Canfield, J. Opt. Soc. Amer. 51, 838 (1961).
    [CrossRef]
  9. R. Kato, J. Phys. Soc. Japan 16, 2525 (1961).
    [CrossRef]
  10. D. M. Roessler, W. C. Walker, J. Opt. Soc. Amer. 57, 835 (1967).
    [CrossRef]
  11. W. R. Hunter, J. Opt. Soc. Amer. 54, 208 (1964).
    [CrossRef]
  12. J. A. Berning, P. H. Berning, J. Opt. Soc. Amer. 50, 813 (1960).
    [CrossRef]

1967 (1)

D. M. Roessler, W. C. Walker, J. Opt. Soc. Amer. 57, 835 (1967).
[CrossRef]

1966 (1)

1965 (1)

G. Hass, W. R. Hunter, R. Tousey, J. Opt. Soc. Amer. 46, 1009 (1965); J. Opt. Soc. Amer. 47, 1070 (1957).

1964 (1)

W. R. Hunter, J. Opt. Soc. Amer. 54, 208 (1964).
[CrossRef]

1963 (1)

R. P. Madden, L. R. Canfield, G. Hass, J. Opt. Soc. Amer. 53, 620 (1963).
[CrossRef]

1961 (3)

R. P. Madden, L. R. Canfield, J. Opt. Soc. Amer. 51, 838 (1961).
[CrossRef]

R. Kato, J. Phys. Soc. Japan 16, 2525 (1961).
[CrossRef]

D. W. Angel, W. R. Hunter, R. Tousey, G. Hass, J. Opt. Soc. Amer. 51, 913 (1961).
[CrossRef]

1960 (2)

P. H. Berning, G. Hass, R. P. Madden, J. Opt. Soc. Amer. 50, 586 (1960).
[CrossRef]

J. A. Berning, P. H. Berning, J. Opt. Soc. Amer. 50, 813 (1960).
[CrossRef]

1959 (1)

G. Hass, R. Tousey, J. Opt. Soc. Amer. 49, 593 (1959).
[CrossRef]

1948 (1)

H. Harting, Sitzber, Deut. Akad. Wiss. Berlin 4, 3 (1948).

Angel, D. W.

D. W. Angel, W. R. Hunter, R. Tousey, G. Hass, J. Opt. Soc. Amer. 51, 913 (1961).
[CrossRef]

Berning, J. A.

J. A. Berning, P. H. Berning, J. Opt. Soc. Amer. 50, 813 (1960).
[CrossRef]

Berning, P. H.

J. A. Berning, P. H. Berning, J. Opt. Soc. Amer. 50, 813 (1960).
[CrossRef]

P. H. Berning, G. Hass, R. P. Madden, J. Opt. Soc. Amer. 50, 586 (1960).
[CrossRef]

Canfield, L. R.

L. R. Canfield, G. Hass, J. E. Waylonis, Appl. Opt. 5, 45 (1966).
[CrossRef] [PubMed]

R. P. Madden, L. R. Canfield, G. Hass, J. Opt. Soc. Amer. 53, 620 (1963).
[CrossRef]

R. P. Madden, L. R. Canfield, J. Opt. Soc. Amer. 51, 838 (1961).
[CrossRef]

Harting, H.

H. Harting, Sitzber, Deut. Akad. Wiss. Berlin 4, 3 (1948).

Hass, G.

L. R. Canfield, G. Hass, J. E. Waylonis, Appl. Opt. 5, 45 (1966).
[CrossRef] [PubMed]

G. Hass, W. R. Hunter, R. Tousey, J. Opt. Soc. Amer. 46, 1009 (1965); J. Opt. Soc. Amer. 47, 1070 (1957).

R. P. Madden, L. R. Canfield, G. Hass, J. Opt. Soc. Amer. 53, 620 (1963).
[CrossRef]

D. W. Angel, W. R. Hunter, R. Tousey, G. Hass, J. Opt. Soc. Amer. 51, 913 (1961).
[CrossRef]

P. H. Berning, G. Hass, R. P. Madden, J. Opt. Soc. Amer. 50, 586 (1960).
[CrossRef]

G. Hass, R. Tousey, J. Opt. Soc. Amer. 49, 593 (1959).
[CrossRef]

Hunter, W. R.

G. Hass, W. R. Hunter, R. Tousey, J. Opt. Soc. Amer. 46, 1009 (1965); J. Opt. Soc. Amer. 47, 1070 (1957).

W. R. Hunter, J. Opt. Soc. Amer. 54, 208 (1964).
[CrossRef]

D. W. Angel, W. R. Hunter, R. Tousey, G. Hass, J. Opt. Soc. Amer. 51, 913 (1961).
[CrossRef]

Kato, R.

R. Kato, J. Phys. Soc. Japan 16, 2525 (1961).
[CrossRef]

Madden, R. P.

R. P. Madden, L. R. Canfield, G. Hass, J. Opt. Soc. Amer. 53, 620 (1963).
[CrossRef]

R. P. Madden, L. R. Canfield, J. Opt. Soc. Amer. 51, 838 (1961).
[CrossRef]

P. H. Berning, G. Hass, R. P. Madden, J. Opt. Soc. Amer. 50, 586 (1960).
[CrossRef]

Roessler, D. M.

D. M. Roessler, W. C. Walker, J. Opt. Soc. Amer. 57, 835 (1967).
[CrossRef]

Tousey, R.

G. Hass, W. R. Hunter, R. Tousey, J. Opt. Soc. Amer. 46, 1009 (1965); J. Opt. Soc. Amer. 47, 1070 (1957).

D. W. Angel, W. R. Hunter, R. Tousey, G. Hass, J. Opt. Soc. Amer. 51, 913 (1961).
[CrossRef]

G. Hass, R. Tousey, J. Opt. Soc. Amer. 49, 593 (1959).
[CrossRef]

Walker, W. C.

D. M. Roessler, W. C. Walker, J. Opt. Soc. Amer. 57, 835 (1967).
[CrossRef]

Waylonis, J. E.

Appl. Opt. (1)

J. Opt. Soc. Amer. (9)

D. W. Angel, W. R. Hunter, R. Tousey, G. Hass, J. Opt. Soc. Amer. 51, 913 (1961).
[CrossRef]

G. Hass, W. R. Hunter, R. Tousey, J. Opt. Soc. Amer. 46, 1009 (1965); J. Opt. Soc. Amer. 47, 1070 (1957).

R. P. Madden, L. R. Canfield, J. Opt. Soc. Amer. 51, 838 (1961).
[CrossRef]

D. M. Roessler, W. C. Walker, J. Opt. Soc. Amer. 57, 835 (1967).
[CrossRef]

W. R. Hunter, J. Opt. Soc. Amer. 54, 208 (1964).
[CrossRef]

J. A. Berning, P. H. Berning, J. Opt. Soc. Amer. 50, 813 (1960).
[CrossRef]

R. P. Madden, L. R. Canfield, G. Hass, J. Opt. Soc. Amer. 53, 620 (1963).
[CrossRef]

G. Hass, R. Tousey, J. Opt. Soc. Amer. 49, 593 (1959).
[CrossRef]

P. H. Berning, G. Hass, R. P. Madden, J. Opt. Soc. Amer. 50, 586 (1960).
[CrossRef]

J. Phys. Soc. Japan (1)

R. Kato, J. Phys. Soc. Japan 16, 2525 (1961).
[CrossRef]

Sitzber, Deut. Akad. Wiss. Berlin (1)

H. Harting, Sitzber, Deut. Akad. Wiss. Berlin 4, 3 (1948).

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Figures (8)

Fig. 1
Fig. 1

Monitoring curve for controlling LiF film thickness during the deposition by measuring the decrease in reflectance of a glass surface at λ = 2537 Å. (4.7% reflectance = 100 divisions.)

Fig. 2
Fig. 2

Optical constants of single crystalline LiF (Roessler and Walker10).

Fig. 3
Fig. 3

Calculated reflectance at λ = 1026 Å and 1216 Å of Al + LiF as a function of the LiF film thickness. Optical constants used for LiF are those of single crystals as reported by Roessler and Walker.10

Fig. 4
Fig. 4

Transmittance at λ = 1216 Å of a 2500 Å thick LiF film on a LiF plate for which the sample: (a) had not been exposed to air, or (b) had initially been exposed to air for 8 min then put back in vacuum.

Fig. 5
Fig. 5

Extinction coefficient at λ = 1216 Å of a 2500 Å thick LiF film on a LiF plate for which the sample: (a) had not been exposed to air, or (b) had initially been exposed to air for 8 min then put back in vacuum.

Fig. 6
Fig. 6

Calculated effect of surface films with n = 1.6 and values of k ranging from 0 to 0.1 on the reflectance of Al at λ = 1216 Å.

Fig. 7
Fig. 7

Calculated effect of surface films with n = 2.2 and values of k ranging from 0 to 0.2 on the reflectance of Al at λ = 1026 Å.

Fig. 8
Fig. 8

Reflectance of an evaporated Al film with a 140-Å thick LiF overcoating in the region from 900 Å to 1900 Å. Measurements were begun 10 min after the evaporation was completed.

Tables (1)

Tables Icon

Table I Extinction Coefficients of LiF in Single Crystalline and Vacuum Deposited Film Form for Various Wavelengths in the Vacuum Ultraviolet

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