Abstract

A 21-ft original concave diffraction grating, ruled in aluminum and blazed for 5500 Å, has been overcoated with a 1000-Å layer of aluminum followed by a 265-Å layer of magnesium fluoride. The relative grating efficiency has been evaluated in spectral orders 2 through 6 at 1335 Å. It was found that the efficiency was increased 12 times at 1335 Å (4th order) and 20 times at 1215 Å (5th order). The blaze was considerably sharper after coating than before coating. No impairment in resolving power resulted.

© 1962 Optical Society of America

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References

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    [Crossref]
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    [Crossref]
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    [Crossref]

1961 (1)

1960 (1)

1957 (4)

1956 (2)

1955 (1)

Angel, D. W.

Berning, P. H.

Hass, G.

Hunter, W. R.

Lofthus, A.

A. Lofthus, J. Chem. Phys. 25, 494 (1956).
[Crossref]

Madden, R. P.

Tousey, R.

Wilkinson, P. G.

P. G. Wilkinson, Astrophys. J. 1, 10 (1957).
[Crossref]

P. G. Wilkinson, J. Mol. Spectroscopy 1, 288 (1957).
[Crossref]

P. G. Wilkinson, J. Opt. Soc. Am. 45, 1044 (1955).
[Crossref]

Astrophys. J. (1)

P. G. Wilkinson, Astrophys. J. 1, 10 (1957).
[Crossref]

J. Chem. Phys. (1)

A. Lofthus, J. Chem. Phys. 25, 494 (1956).
[Crossref]

J. Mol. Spectroscopy (1)

P. G. Wilkinson, J. Mol. Spectroscopy 1, 288 (1957).
[Crossref]

J. Opt. Soc. Am. (6)

Other (1)

Model 78-860, 6.65-m Off-Plane Eagle vacuum spectrograph, The Jarrell-Ash Company, Newtonville, Massachusetts.

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Figures (1)

Fig. 1
Fig. 1

The 2-0 band of the Lyman-Birge-Hopfield system (a1ΠgX1g+) of nitrogen. (a) Before coating. (b) After coating with Al+MgF2 the first time. (c) After coating with Al+MgF2 the second time.

Tables (2)

Tables Icon

Table I Reflectance of a plane-aluminized test plate overcoated with magnesium fluoride.

Tables Icon

Table II Relative grating efficiencies at 1335 Å at different angles of incidence.