Abstract

The closure of pinholes due to plasma created by intense laser radiation interacting with the pinhole perimeter is studied. Pinholes with 100–300-μm initial diam close in 3–14 nsec, respectively, for a 10-nsec FWHA, 10-J incident laser pulse. For a constant focal spot size and pulse duration, the closure time and rate are found to be a function of laser energy; however, the energy transmitted through the pinhole is independent of the incident energy for the pulse duration, pinhole diameters, and focal spot size used in these experiments.

© 1977 Optical Society of America

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References

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  1. W. W. Simons, S. Guch, F. Rainer, J. E. Murray, “A High Energy Spatial Filter for Removal of Small Scale Beam Instabilities in High Power Solid State Lasers,” Lawrence Livermore Laboratory, Livermore, Calif., Report UCRL-76873 (May1975).
  2. P. J. Brannon, J. P. Anthes, G. L. Cano, J. E. Powell, J. Appl. Phys. 46, 3576 (1975).
    [CrossRef]

1975 (1)

P. J. Brannon, J. P. Anthes, G. L. Cano, J. E. Powell, J. Appl. Phys. 46, 3576 (1975).
[CrossRef]

Anthes, J. P.

P. J. Brannon, J. P. Anthes, G. L. Cano, J. E. Powell, J. Appl. Phys. 46, 3576 (1975).
[CrossRef]

Brannon, P. J.

P. J. Brannon, J. P. Anthes, G. L. Cano, J. E. Powell, J. Appl. Phys. 46, 3576 (1975).
[CrossRef]

Cano, G. L.

P. J. Brannon, J. P. Anthes, G. L. Cano, J. E. Powell, J. Appl. Phys. 46, 3576 (1975).
[CrossRef]

Guch, S.

W. W. Simons, S. Guch, F. Rainer, J. E. Murray, “A High Energy Spatial Filter for Removal of Small Scale Beam Instabilities in High Power Solid State Lasers,” Lawrence Livermore Laboratory, Livermore, Calif., Report UCRL-76873 (May1975).

Murray, J. E.

W. W. Simons, S. Guch, F. Rainer, J. E. Murray, “A High Energy Spatial Filter for Removal of Small Scale Beam Instabilities in High Power Solid State Lasers,” Lawrence Livermore Laboratory, Livermore, Calif., Report UCRL-76873 (May1975).

Powell, J. E.

P. J. Brannon, J. P. Anthes, G. L. Cano, J. E. Powell, J. Appl. Phys. 46, 3576 (1975).
[CrossRef]

Rainer, F.

W. W. Simons, S. Guch, F. Rainer, J. E. Murray, “A High Energy Spatial Filter for Removal of Small Scale Beam Instabilities in High Power Solid State Lasers,” Lawrence Livermore Laboratory, Livermore, Calif., Report UCRL-76873 (May1975).

Simons, W. W.

W. W. Simons, S. Guch, F. Rainer, J. E. Murray, “A High Energy Spatial Filter for Removal of Small Scale Beam Instabilities in High Power Solid State Lasers,” Lawrence Livermore Laboratory, Livermore, Calif., Report UCRL-76873 (May1975).

J. Appl. Phys. (1)

P. J. Brannon, J. P. Anthes, G. L. Cano, J. E. Powell, J. Appl. Phys. 46, 3576 (1975).
[CrossRef]

Other (1)

W. W. Simons, S. Guch, F. Rainer, J. E. Murray, “A High Energy Spatial Filter for Removal of Small Scale Beam Instabilities in High Power Solid State Lasers,” Lawrence Livermore Laboratory, Livermore, Calif., Report UCRL-76873 (May1975).

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Figures (7)

Fig. 1
Fig. 1

Spatial profile of 1.06-μm laser beam focused with an f/4.3 aspheric lens.

Fig. 2
Fig. 2

Schematic of experiment to measure pinhole closure.

Fig. 3
Fig. 3

Closure time as a function of initial pinhole diameter for 100-μm(- - -), 200-μm (-··-), 300-μm(···) and 400-μm(—) pinholes.

Fig. 4
Fig. 4

Effect of defocusing the laser beam incident on 300-μm pinholes; both the focused(—) and defocused (- -) results are shown.

Fig. 5
Fig. 5

Effect of initial misalignment of the focused laser beam on the closure rate for 300-μm pinholes; both the aligned (—) and misaligned (- - -) closure rates are shown.

Fig. 6
Fig. 6

Closure time of 200-μm diam holes as a function of incident energy for energies of 8.2 J (-··-), 11.5 J (- - -), and 15.5 J (—).

Fig. 7
Fig. 7

Comparison of a 300-μm pinhole closure time measured by 1.06-μm radiation transmitted through the pinhole (···) with closure time measured by 4880 argon ion laser (—).

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