Abstract

A high resolution seven-channel Fabry-Perot interferometer spectrum analyzer is described that was used in laser scattering experiments on a θ-pinch plasma where the spectral width to be measured was of the order of 1 Å. The resolution of the system was 0.2 Å and covered a wavelength interval of 1.4 Å. The interferometer was of the pressure tuned type, using dry nitrogen gas, to center the laser radiation on any given channel for wavelength calibration of the system. The Fabry-Perot plates had to be antireflection coated for proper performance of the system. A complete profile of the Doppler broadened scattered light is obtained in a single discharge, and a typical spectral profile is shown.

© 1972 Optical Society of America

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References

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  1. J. G. Hirchberg, P. Platz, Appl. Opt. 4, 1375 (1965).
    [CrossRef]
  2. L. Glock, in Proceedings of the 7th International Conference on Ionization Phenomena in Gases, Belgrade, 1965 (Gradjevin-ska Knijga Publishing House, Belgrade, Yugoslavia, 1966).
  3. A. D. Beach, J. Sci. Instrum. 44, 690 (1967).
    [CrossRef]
  4. P. K. John, R. Benesch, S. A. Ramsden, Bull. Am. Phys. Soc. 12, 743 (1967).
  5. S. A. Ramsden, P. K. John, B. Kronast, R. Benesch, Phys. Rev. Lett. 19, 688 (1967).
    [CrossRef]
  6. P. K. John, B. Kronast, Bull. Am. Phys. Soc. 13, 1550 (1968).
  7. J. Katzenstein, Appl. Opt. 4, 263 (1965).
    [CrossRef]
  8. M. J. Forrest, Culham Lab. Rept. CLM-P116.
  9. K. W. Meissner, J. Opt. Soc. Am. 31, 405 (1941).
    [CrossRef]
  10. T. H. McLeod, J. Opt. Soc. Am. 44, 592 (1954).
    [CrossRef]
  11. P. Jacquinot, Reports on Progress in Physics (1960), p. 279.
  12. E. E. Salpeter, Phys. Rev. 120, 1528 (1960).
    [CrossRef]

1968 (1)

P. K. John, B. Kronast, Bull. Am. Phys. Soc. 13, 1550 (1968).

1967 (3)

A. D. Beach, J. Sci. Instrum. 44, 690 (1967).
[CrossRef]

P. K. John, R. Benesch, S. A. Ramsden, Bull. Am. Phys. Soc. 12, 743 (1967).

S. A. Ramsden, P. K. John, B. Kronast, R. Benesch, Phys. Rev. Lett. 19, 688 (1967).
[CrossRef]

1965 (2)

1960 (2)

P. Jacquinot, Reports on Progress in Physics (1960), p. 279.

E. E. Salpeter, Phys. Rev. 120, 1528 (1960).
[CrossRef]

1954 (1)

1941 (1)

Beach, A. D.

A. D. Beach, J. Sci. Instrum. 44, 690 (1967).
[CrossRef]

Benesch, R.

P. K. John, R. Benesch, S. A. Ramsden, Bull. Am. Phys. Soc. 12, 743 (1967).

S. A. Ramsden, P. K. John, B. Kronast, R. Benesch, Phys. Rev. Lett. 19, 688 (1967).
[CrossRef]

Forrest, M. J.

M. J. Forrest, Culham Lab. Rept. CLM-P116.

Glock, L.

L. Glock, in Proceedings of the 7th International Conference on Ionization Phenomena in Gases, Belgrade, 1965 (Gradjevin-ska Knijga Publishing House, Belgrade, Yugoslavia, 1966).

Hirchberg, J. G.

Jacquinot, P.

P. Jacquinot, Reports on Progress in Physics (1960), p. 279.

John, P. K.

P. K. John, B. Kronast, Bull. Am. Phys. Soc. 13, 1550 (1968).

P. K. John, R. Benesch, S. A. Ramsden, Bull. Am. Phys. Soc. 12, 743 (1967).

S. A. Ramsden, P. K. John, B. Kronast, R. Benesch, Phys. Rev. Lett. 19, 688 (1967).
[CrossRef]

Katzenstein, J.

Kronast, B.

P. K. John, B. Kronast, Bull. Am. Phys. Soc. 13, 1550 (1968).

S. A. Ramsden, P. K. John, B. Kronast, R. Benesch, Phys. Rev. Lett. 19, 688 (1967).
[CrossRef]

McLeod, T. H.

Meissner, K. W.

Platz, P.

Ramsden, S. A.

P. K. John, R. Benesch, S. A. Ramsden, Bull. Am. Phys. Soc. 12, 743 (1967).

S. A. Ramsden, P. K. John, B. Kronast, R. Benesch, Phys. Rev. Lett. 19, 688 (1967).
[CrossRef]

Salpeter, E. E.

E. E. Salpeter, Phys. Rev. 120, 1528 (1960).
[CrossRef]

Appl. Opt. (2)

Bull. Am. Phys. Soc. (2)

P. K. John, B. Kronast, Bull. Am. Phys. Soc. 13, 1550 (1968).

P. K. John, R. Benesch, S. A. Ramsden, Bull. Am. Phys. Soc. 12, 743 (1967).

J. Opt. Soc. Am. (2)

J. Sci. Instrum. (1)

A. D. Beach, J. Sci. Instrum. 44, 690 (1967).
[CrossRef]

Phys. Rev. (1)

E. E. Salpeter, Phys. Rev. 120, 1528 (1960).
[CrossRef]

Phys. Rev. Lett. (1)

S. A. Ramsden, P. K. John, B. Kronast, R. Benesch, Phys. Rev. Lett. 19, 688 (1967).
[CrossRef]

Reports on Progress in Physics (1)

P. Jacquinot, Reports on Progress in Physics (1960), p. 279.

Other (2)

L. Glock, in Proceedings of the 7th International Conference on Ionization Phenomena in Gases, Belgrade, 1965 (Gradjevin-ska Knijga Publishing House, Belgrade, Yugoslavia, 1966).

M. J. Forrest, Culham Lab. Rept. CLM-P116.

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Figures (8)

Fig. 1
Fig. 1

General schematic of the scattering experiment.

Fig. 2
Fig. 2

Details of the seven-channel Fabry-Perot spectrum analyzer.

Fig. 3
Fig. 3

Front view of the image dissector mounted on its kinematically adjustable frame.

Fig. 4
Fig. 4

Fabry-Perot interferometer housing (1) interferometer plates, (2) spacer, (3) optical windows, (4) kinematic mount, (5) screw for adjusting the interferometer plates, (6) beryllium–copper tension bar that controls the pressure exerted by the above screw, (7) screw to adjust tension on the Be–Cu bar, (8) external control rod to adjust the interferometer plates via items (7), (6), and (5), (9) spring-loaded screw coupling of the plate mount to the pressure chamber [items (4) through (9), three each 120° apart] (10) gas inlet, (11) pressure chamber.

Fig. 5
Fig. 5

Ruby laser line profile (a) before antireflection coating the Fabry-Perot plates, (b) after antireflection coating.

Fig. 6
Fig. 6

Typical set of data obtained in a single shot showing sharp scattering signals superimposed on the continuum plasma light signal on photodiode, that is, the laser power monitor and interferogram on the laser wavelength monitor. Also shown at the top is a time resolved streak photograph of the plasma showing plasma duration and the time of scattering.

Fig. 7
Fig. 7

Scattered spectrum (a1). Experimental scattering points are fitted to the solid theoretical curve (a2). Stray light profile.

Fig. 8
Fig. 8

Scattered spectrum using single-channel system, the experimental points fitted to theoretical curve.

Equations (5)

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n λ = 2 μ t cos θ ,
Δ λ = ( λ n / 8 f 2 ) ( d n 2 - d n 2 ) ,
Δ λ = λ n ( θ 2 / 2 ) .
Δ λ = λ / ( 8 f 2 ) d 2 .
θ = [ 2 ( Δ λ ) / λ ] 1 2 ,

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