Abstract

The automatic control of the spacing of Fabry–Perot interferometers to transmit at a given wavelength is discussed, and an interferometer is described in which the plates are maintained parallel to within the accuracy of the plates themselves and at a preset spacing. The variation in mean spacing over test periods of several hours has not exceeded ± 0.7 nm despite temperature fluctuations and other uncontrolled environmental conditions.

© 1966 Optical Society of America

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References

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  1. J. V. Ramsay, Appl. Opt. 1, 411 (1962).
    [CrossRef]
  2. H. Kobler, Proc. Inst. Radio Engrs. (Australia) 24, 677 (1963).
  3. R. N. Smartt, J. V. Ramsay, J. Sci. Instr. 41, 514 (1964).
    [CrossRef]
  4. J. V. Ramsay, K. Tanaka, J. Sci. Instr. 42, 334 (1965).
    [CrossRef]

1965 (1)

J. V. Ramsay, K. Tanaka, J. Sci. Instr. 42, 334 (1965).
[CrossRef]

1964 (1)

R. N. Smartt, J. V. Ramsay, J. Sci. Instr. 41, 514 (1964).
[CrossRef]

1963 (1)

H. Kobler, Proc. Inst. Radio Engrs. (Australia) 24, 677 (1963).

1962 (1)

Kobler, H.

H. Kobler, Proc. Inst. Radio Engrs. (Australia) 24, 677 (1963).

Ramsay, J. V.

J. V. Ramsay, K. Tanaka, J. Sci. Instr. 42, 334 (1965).
[CrossRef]

R. N. Smartt, J. V. Ramsay, J. Sci. Instr. 41, 514 (1964).
[CrossRef]

J. V. Ramsay, Appl. Opt. 1, 411 (1962).
[CrossRef]

Smartt, R. N.

R. N. Smartt, J. V. Ramsay, J. Sci. Instr. 41, 514 (1964).
[CrossRef]

Tanaka, K.

J. V. Ramsay, K. Tanaka, J. Sci. Instr. 42, 334 (1965).
[CrossRef]

Appl. Opt. (1)

J. Sci. Instr. (2)

R. N. Smartt, J. V. Ramsay, J. Sci. Instr. 41, 514 (1964).
[CrossRef]

J. V. Ramsay, K. Tanaka, J. Sci. Instr. 42, 334 (1965).
[CrossRef]

Proc. Inst. Radio Engrs. (Australia) (1)

H. Kobler, Proc. Inst. Radio Engrs. (Australia) 24, 677 (1963).

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Figures (5)

Fig. 1
Fig. 1

A diagrammatic representation of the principles of spacing control using a reference interferometer.

Fig. 2
Fig. 2

Photograph of an interferometer equipped with automatic parallelism and spacing control.

Fig. 3
Fig. 3

Records showing stability of control when a reference interferometer is used. Top left shows the transmittance of the working aperture as a function of its spacing; top right indicates the transmittance of the reference interferometer and the spacing control aperture as a function of variation in spacing of the latter about the position of identical spacings. The two lower results illustrate the stability of control when set to transmit about 0.5–0.6 maximum, the one on the left showing relatively long-term drifts (<0.3 sec), and the one on the right showing short-term variations in transmittance of the working aperture. The 100-c/s ripple comes from the cadmium lamp used for testing; it should be ignored.

Fig. 4
Fig. 4

Experimental results showing the change in flux transmitted by the reference and spacing control interferometers as the spacing of the latter is varied. The approximate ratio of the spacing of the reference interferometer to that of the main interferometer is given, the central fringe representing an exact integral ratio in each case. Those on the left are obtained when the control surfaces are coated with silver plus λ/4 magnesium fluoride plus λ/4 zinc sulphide; those on the right are obtained when the surfaces are coated with aluminum. For each coating the transmitted flux has been normalized to read unity for the central maxima in the case of the nominal ratio 1:1.

Fig. 5
Fig. 5

Records showing stability of control when using a single-mode 632-nm He–Ne laser. The layout of these results is the same as for Fig. 3.

Equations (1)

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τ = λ B ( λ ) f ( S , λ ) f ( S - x , λ ) d λ ,

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