Abstract

The use of a very long straight entrance slit in an Ebert grating spectrometer with two plane mirrors at the shorter exit slit to increase the energy density is described. This system has been employed in a far uv rocket spectrometer to provide higher sensitivity than has been achieved previously. The imaging properties and required slit and mirror adjustments are presented. Experimental results are included.

© 1972 Optical Society of America

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References

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  1. W. G. Fastie, J. Opt. Soc. Am. 42, 641 (1952).
    [CrossRef]
  2. W. G. Fastie, J. Opt. Soc. Am. 42, 647 (1952).
    [CrossRef]
  3. H. M. Crosswhite, W. G. Fastie, J. Opt. Soc. Am. 46, 110 (1956).
    [CrossRef]
  4. W. Benesch, J. Strong, J. Opt. Soc. Am. 41, 252 (1951).
    [CrossRef]
  5. W. R. Hunter, J. F. Osantowski, G. Hass, Appl. Opt. 10, 540 (1971).
    [CrossRef] [PubMed]

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1956 (1)

1952 (2)

1951 (1)

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Figures (7)

Fig. 1
Fig. 1

Side view of exit slit mirrors showing defocused end of slit image. Point B in focal plane reflects to point C inside focal plane.

Fig. 2
Fig. 2

Side view of entrance slit with ends of slit inside of focal plane.

Fig. 3
Fig. 3

Side view of slit mirrors showing reflected slit image E in focal plane.

Fig. 4
Fig. 4

Plan view of Ebert spectrometer showing location of truncated exit slit mirrors.

Fig. 5
Fig. 5

End-on view of exit slit mirrors showing tilt to correct for spectral curvature.

Fig. 6
Fig. 6

Diagram of slit plane showing astigmatic image of length ΔL at end of slit image.

Fig. 7
Fig. 7

Plot of flight spectral data showing 11.5-Å half-width. Physical slit widths were 10 Å.

Tables (1)

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Table I Optical Parameters

Equations (14)

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Δ λ = λ L 2 / 8 F 2 ,
S ( mm ) = Δ λ / R D ,
R = L 2 / 8 S ;
R ( mm ) = [ R D ( Å / mm ) ] / λ ( Å ) F 2 ( mm ) .
1 / F cos ϕ = ( 1 / O D V ) + ( 1 / I D V )
cos ϕ / F = ( 1 / O D H ) + ( 1 / I D H ) ,
Δ F = 2 F ϕ 2 ,
Δ L = 2 F ϕ 2 / f ,
Δ W = Δ L × L / D s ,
ϕ = ( D s / 2 F ) - ( D s G / 4 F 2 ) .
ϕ = 0.3 D s / F .
Δ W = 0.18 L D s / f F ,
d λ = Δ W R D = 0.18 L D s R D / f F ,
δ λ = ( λ e - λ ) [ ( L 2 ) / 8 F 2 ] ,

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