Abstract

At certain small angles of the grating, any in-plane spectrometer will pass stray light that has been returned by the reflecting optics for a second diffraction. Paths of this source of stray light and its structure have been calculated and confirmed experimentally.

© 1968 Optical Society of America

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References

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  1. A. Watanabe, G. C. Tabisz, Appl. Opt. 6, 1132 (1967).
    [CrossRef] [PubMed]
  2. C. M. Penchina, Appl. Opt. 6, 1029 (1967).
    [CrossRef] [PubMed]

1967 (2)

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Figures (6)

Fig. 1
Fig. 1

Schematic of the Spex Czerny-Turner monochromator with principal ray traced. A = 76 mm, B = 24 mm, C = 126 mm, E = 635 mm, F = 748 mm, W = 102 mm, ϕ0 = 0.1176 rad (6°44′10″).

Fig. 2
Fig. 2

Schematic with two double diffraction paths. Ray A reflected twice from the collimating mirror; ray B reflected twice from the focusing mirror. Note definitions of y and ϕ.

Fig. 3
Fig. 3

The y-ϕ Cartesian plane. Shaded areas contain points corresponding to paths of type A and B, respectively, in Fig. 2, Line segments (6a) and (6b) are each derived from two simultaneous grating equations.

Fig. 4
Fig. 4

Wavelength range of stray light (shaded area) as a function of monochromator setting. Only stray light resulting from double diffraction in the first and zeroth orders is represented.

Fig. 5
Fig. 5

Spectrum of stray light for monochromator setting 1800 Å.

Fig. 6
Fig. 6

Spectrum of stray light for monochromator setting 2300 Å.

Equations (14)

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ϕ - [ y / ( F cos 1 2 ϕ 0 ) ] ± ϕ 0 - [ A / ( F cos 1 2 ϕ 0 ) ]
- 1 2 w + E tan ϕ < y < + 1 2 w + E tan ϕ .
- 1 2 w + E ϕ < y < + 1 2 w + E ϕ .
- C < y < - B
B < y < C .
- 1 2 w < y + E [ ϕ - y ( F cos 1 2 ϕ 0 ) + ( ϕ 0 - A F cos 1 2 ϕ 0 ) ] < + 1 2 w ,
- 1 2 w < y + E [ ϕ - y F cos 1 2 ϕ 0 - ( ϕ 0 - A F cos 1 2 ϕ 0 ) ] < + 1 2 w .
n λ = d [ ( θ + ϕ 0 ) + ( θ - ϕ ) ] ,
m λ = d { [ θ + ϕ - y F cos 1 2 ϕ 0 + ( ϕ 0 - A F cos 1 2 ϕ 0 ) ] + [ θ - ϕ 0 ] }
m λ = d { [ θ + ϕ - y F cos 1 2 ϕ 0 - ( ϕ 0 - A F cos 1 2 ϕ 0 ) ] + [ θ - ϕ 0 ] }
2.01 λ 0 + 780 Å < λ < 1.16 λ 0 + 3050 Å .
above 3160 Å : 7.67 λ 0 - 20300 Å below 3160 Å : 1.16 λ 0 + 270 Å < λ < 2.01 λ 0 - 780 Å
0.667 λ 0 + 260 Å < λ < 0.884 λ 0 - 210 Å for λ 0 < 4700 Å 0.535 λ 0 + 1410 Å for λ 0 > 4700 Å ;
for λ 0 < 7010 Å : 0.535 λ 0 + 170 Å for λ 0 > 7010 Å : 0.884 λ 0 - 2340 Å < λ < 0.667 λ 0 - 260 Å .

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