Abstract

An experimental investigation has been made on plasma closure in pinholes irradiated by Nd glass laser pulses; 300–500-μm diam pinholes of various materials and thicknesses have been irradiated by 20–100-J 300-psec FWHM pulses on the Janus laser system. Calorimetry measurements have yielded data on pinhole energy transmission and intensity loading on the periphery of the pinhole. Ultrafast streak photography measurements indicate effective closure velocities of 2–5 × 107 cm/sec. Scattered light measurements have shown the transmission loss through a typical spatial filter configuration to be primarily refractive in nature.

© 1979 Optical Society of America

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References

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  1. D. R. Speck et al., Lawrence Livermore Laboratory UCRL 79816 (September1977).
  2. W. W. Simmons et al., in Technical Digest of Conference on Laser Engineering and Applications; IEEE J. Quant. Electron. QE-11, 30D (1975).
  3. J. T. Hunt et al., Lawrence Livermore Laboratory UCRL 79904 (August1977).
  4. J. S. Pearlman, J. P. Anthes, Appl. Opt. 16, 2328 (1977).
    [CrossRef] [PubMed]
  5. D. T. Attwood, in Proceedings of the 12th International Congress on High Speed Photography, Lawrence Livermore Laboratory UCRL 77744 (1976).
  6. J. M. Auerbach, D. T. Attwood, P. H. Y. Lee, D. W. Sweeney, Lawrence Livermore Laboratory UCRL 79775 (October1977).
  7. J. P. Anthes et al., Phys. Rev. Lett. 41, 1300 (1978).
    [CrossRef]
  8. D. C. Slater et al., Bull. Am. Phys. Soc. 23, 767 (1978).
  9. M. Born, E. Wolf, Principles of Optics (Pergamon, New York, 1970).

1978 (2)

J. P. Anthes et al., Phys. Rev. Lett. 41, 1300 (1978).
[CrossRef]

D. C. Slater et al., Bull. Am. Phys. Soc. 23, 767 (1978).

1977 (1)

1975 (1)

W. W. Simmons et al., in Technical Digest of Conference on Laser Engineering and Applications; IEEE J. Quant. Electron. QE-11, 30D (1975).

Anthes, J. P.

Attwood, D. T.

J. M. Auerbach, D. T. Attwood, P. H. Y. Lee, D. W. Sweeney, Lawrence Livermore Laboratory UCRL 79775 (October1977).

D. T. Attwood, in Proceedings of the 12th International Congress on High Speed Photography, Lawrence Livermore Laboratory UCRL 77744 (1976).

Auerbach, J. M.

J. M. Auerbach, D. T. Attwood, P. H. Y. Lee, D. W. Sweeney, Lawrence Livermore Laboratory UCRL 79775 (October1977).

Born, M.

M. Born, E. Wolf, Principles of Optics (Pergamon, New York, 1970).

Hunt, J. T.

J. T. Hunt et al., Lawrence Livermore Laboratory UCRL 79904 (August1977).

Lee, P. H. Y.

J. M. Auerbach, D. T. Attwood, P. H. Y. Lee, D. W. Sweeney, Lawrence Livermore Laboratory UCRL 79775 (October1977).

Pearlman, J. S.

Simmons, W. W.

W. W. Simmons et al., in Technical Digest of Conference on Laser Engineering and Applications; IEEE J. Quant. Electron. QE-11, 30D (1975).

Slater, D. C.

D. C. Slater et al., Bull. Am. Phys. Soc. 23, 767 (1978).

Speck, D. R.

D. R. Speck et al., Lawrence Livermore Laboratory UCRL 79816 (September1977).

Sweeney, D. W.

J. M. Auerbach, D. T. Attwood, P. H. Y. Lee, D. W. Sweeney, Lawrence Livermore Laboratory UCRL 79775 (October1977).

Wolf, E.

M. Born, E. Wolf, Principles of Optics (Pergamon, New York, 1970).

Appl. Opt. (1)

Bull. Am. Phys. Soc. (1)

D. C. Slater et al., Bull. Am. Phys. Soc. 23, 767 (1978).

Phys. Rev. Lett. (1)

J. P. Anthes et al., Phys. Rev. Lett. 41, 1300 (1978).
[CrossRef]

Technical Digest of Conference on Laser Engineering and Applications (1)

W. W. Simmons et al., in Technical Digest of Conference on Laser Engineering and Applications; IEEE J. Quant. Electron. QE-11, 30D (1975).

Other (5)

J. T. Hunt et al., Lawrence Livermore Laboratory UCRL 79904 (August1977).

D. T. Attwood, in Proceedings of the 12th International Congress on High Speed Photography, Lawrence Livermore Laboratory UCRL 77744 (1976).

J. M. Auerbach, D. T. Attwood, P. H. Y. Lee, D. W. Sweeney, Lawrence Livermore Laboratory UCRL 79775 (October1977).

D. R. Speck et al., Lawrence Livermore Laboratory UCRL 79816 (September1977).

M. Born, E. Wolf, Principles of Optics (Pergamon, New York, 1970).

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Figures (9)

Fig. 1
Fig. 1

Experimental setup for transmission measurements.

Fig. 2
Fig. 2

Pinhole scattered light distribution.

Fig. 3
Fig. 3

(a) Spatial filter transmission as a function of pulse energy for various pinhole materials and a constant diameter of 300 μm. (b) Spatial filter transmission as a function of pinhole diameter.

Fig. 4
Fig. 4

Pinhole periphery intensity loading.

Fig. 5
Fig. 5

Streak camera record showing closure signature in spatial filter pinhole.

Fig. 6
Fig. 6

Experimental setup for closure velocity measurement.

Fig. 7
Fig. 7

Streak record for determining closure velocity.

Fig. 8
Fig. 8

Calculated refraction angle distribution.

Fig. 9
Fig. 9

Calculated scattered light distribution.

Equations (8)

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n = ( 1 - ω p 2 ω 2 ) 1 / 2 ,
V closure = 2 × 10 7 - 5 × 10 7 cm / sec .
X 0 200 μ m .
N ( Z ) / N c = α + ( f - α ) Z 2 ,
0.1 f 0.5 , 0 α f
θ ( r 0 ) = 0 X 0 / R 1 N d N d Z d l ,
r 0 = F ( θ ) .
P ( θ ) = F F sin θ E π a 2 exp ( - F 2 / a 2 ) ,

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