Abstract

An indium–arsenide detector array installed at the focal plane of a grating spectrometer provides the time history of the intensity of each output line of multiline HF chemical lasers. The construction and calibration of this instrument are discussed, and representative data are presented. Line competition measurements are shown for a 200-W supersonic-diffusion-type HF laser; individual line outputs fluctuate more than total multiline output. The spectral effects of forward/reverse-wave competition on an unstable ring resonator operating at 350 W are detailed. Simultaneous single-line gain measurements on a multiline HF medium are demonstrated. Other applications of this useful instrument are discussed.

© 1984 Optical Society of America

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References

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  1. R. W. F. Gross, J. F. Bott, Eds., Handbook of Chemical Lasers (Wiley, New York, 1976).
  2. Optical Engineering, Inc., P.O. Box 696, Santa Rosa, Calif. 95402. (707) 528-1060.
  3. Judson Infrared, Inc., 565 Virginia Drive, Ft. Washington, Pa. 19034. (215) 643-7000.
  4. M. A. Kwok, The Aerospace Corp.; private communication. See also Ref. 1.
  5. J. T. Lewis et al., private comm.
  6. J. G. Coffer, J. M. Bernard, R. A. Chodzko, E. B. Turner, R. W. F. Gross, W. R. Warren, Appl. Opt. 22, 142 (1983).
    [CrossRef] [PubMed]

1983 (1)

Appl. Opt. (1)

Other (5)

R. W. F. Gross, J. F. Bott, Eds., Handbook of Chemical Lasers (Wiley, New York, 1976).

Optical Engineering, Inc., P.O. Box 696, Santa Rosa, Calif. 95402. (707) 528-1060.

Judson Infrared, Inc., 565 Virginia Drive, Ft. Washington, Pa. 19034. (215) 643-7000.

M. A. Kwok, The Aerospace Corp.; private communication. See also Ref. 1.

J. T. Lewis et al., private comm.

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Figures (6)

Fig. 1
Fig. 1

Spectrometer optical layout.

Fig. 2
Fig. 2

Typical time history of a 200-W cw HF laser.

Fig. 3
Fig. 3

Power spectral analysis of two of the signals shown in Fig. 2.

Fig. 4
Fig. 4

Typical chopped time histories of the forward and reverse outputs on lines P1(4), P1(6), P2(4), and P2(6) of an HF ring laser.

Fig. 5
Fig. 5

Single-line fringe scans of a Mach-Zehnder interferometer without gain in either arm.

Fig. 6
Fig. 6

Single-line fringe scans of a Mach-Zehnder interferometer with gain in one arm.

Equations (4)

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( I max - I min ) / ( I max + I min ) ,
I max = 1 2 I 0 [ 1 + exp ( G / 2 ) 2 ,
I min = 1 2 I 0 [ 1 - exp ( G / 2 ) ] 2 .
G = 2 ln [ ( I max - I min ) / ( I max + I min ) ] .

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