Abstract

Multikilojoule petawatt lasers using chirped-pulse amplification are being constructed worldwide. Several systems have adopted a tiled-grating approach to meet the size requirements for the compression gratings. Grating tiles need to be precisely phased to ensure a transform-limited focal spot when focusing high-energy laser pulses in the target plane. A computer-control test system that uses a Mach–Zehnder interferometer capable of monitoring and correcting drift in the tiled-grating assemblies within the compressor is described. The differential errors due to eight gratings, within a compressor with four grating assemblies, were compensated by adjusting a single grating.

© 2006 Optical Society of America

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  1. L. J. Waxer, D. N. Maywar, J. H. Kelly, T. J. Kessler, B. E. Kruschwitz, S. J. Loucks, R. L. McCrory, D. D. Meyerhofer, S. F. B. Morse, C. Stoeckl, and J. D. Zuegel, Opt. Photonics News 16, 30 (2005).
    [CrossRef]
  2. N. Miyanaga, presented at the International Workshop on Fast Ignition and High Field Physics (FIHFP 2004), Kyoto, Japan, April 25-29, 2004, paper P2742.
  3. T. J. Kessler, J. Bunkenburg, H. Huang, A. Kozlov, and D. D. Meyerhofer, Opt. Lett. 29, 635 (2004).
    [CrossRef] [PubMed]
  4. N. Yaitskova, K. Dohlen, P. Dierickx, and L. Montoya, J. Opt. Soc. Am. A 22, 1093 (2005).
    [CrossRef]
  5. Laboratory for Laser Energetics LLE Review, Rep. 100, NTIS document DOE/SF/19460-578 (2004), p. 242. Copies may be obtained from the National Technical Information Service, Springfield, Va. 22161.
  6. M. Takeda, H. Ina, and S. Kobayashi, J. Opt. Soc. Am. 72, 156 (1982).
    [CrossRef]

2005 (2)

L. J. Waxer, D. N. Maywar, J. H. Kelly, T. J. Kessler, B. E. Kruschwitz, S. J. Loucks, R. L. McCrory, D. D. Meyerhofer, S. F. B. Morse, C. Stoeckl, and J. D. Zuegel, Opt. Photonics News 16, 30 (2005).
[CrossRef]

N. Yaitskova, K. Dohlen, P. Dierickx, and L. Montoya, J. Opt. Soc. Am. A 22, 1093 (2005).
[CrossRef]

2004 (1)

1982 (1)

Bunkenburg, J.

Dierickx, P.

Dohlen, K.

Huang, H.

Ina, H.

Kelly, J. H.

L. J. Waxer, D. N. Maywar, J. H. Kelly, T. J. Kessler, B. E. Kruschwitz, S. J. Loucks, R. L. McCrory, D. D. Meyerhofer, S. F. B. Morse, C. Stoeckl, and J. D. Zuegel, Opt. Photonics News 16, 30 (2005).
[CrossRef]

Kessler, T. J.

L. J. Waxer, D. N. Maywar, J. H. Kelly, T. J. Kessler, B. E. Kruschwitz, S. J. Loucks, R. L. McCrory, D. D. Meyerhofer, S. F. B. Morse, C. Stoeckl, and J. D. Zuegel, Opt. Photonics News 16, 30 (2005).
[CrossRef]

T. J. Kessler, J. Bunkenburg, H. Huang, A. Kozlov, and D. D. Meyerhofer, Opt. Lett. 29, 635 (2004).
[CrossRef] [PubMed]

Kobayashi, S.

Kozlov, A.

Kruschwitz, B. E.

L. J. Waxer, D. N. Maywar, J. H. Kelly, T. J. Kessler, B. E. Kruschwitz, S. J. Loucks, R. L. McCrory, D. D. Meyerhofer, S. F. B. Morse, C. Stoeckl, and J. D. Zuegel, Opt. Photonics News 16, 30 (2005).
[CrossRef]

Loucks, S. J.

L. J. Waxer, D. N. Maywar, J. H. Kelly, T. J. Kessler, B. E. Kruschwitz, S. J. Loucks, R. L. McCrory, D. D. Meyerhofer, S. F. B. Morse, C. Stoeckl, and J. D. Zuegel, Opt. Photonics News 16, 30 (2005).
[CrossRef]

Maywar, D. N.

L. J. Waxer, D. N. Maywar, J. H. Kelly, T. J. Kessler, B. E. Kruschwitz, S. J. Loucks, R. L. McCrory, D. D. Meyerhofer, S. F. B. Morse, C. Stoeckl, and J. D. Zuegel, Opt. Photonics News 16, 30 (2005).
[CrossRef]

McCrory, R. L.

L. J. Waxer, D. N. Maywar, J. H. Kelly, T. J. Kessler, B. E. Kruschwitz, S. J. Loucks, R. L. McCrory, D. D. Meyerhofer, S. F. B. Morse, C. Stoeckl, and J. D. Zuegel, Opt. Photonics News 16, 30 (2005).
[CrossRef]

Meyerhofer, D. D.

L. J. Waxer, D. N. Maywar, J. H. Kelly, T. J. Kessler, B. E. Kruschwitz, S. J. Loucks, R. L. McCrory, D. D. Meyerhofer, S. F. B. Morse, C. Stoeckl, and J. D. Zuegel, Opt. Photonics News 16, 30 (2005).
[CrossRef]

T. J. Kessler, J. Bunkenburg, H. Huang, A. Kozlov, and D. D. Meyerhofer, Opt. Lett. 29, 635 (2004).
[CrossRef] [PubMed]

Miyanaga, N.

N. Miyanaga, presented at the International Workshop on Fast Ignition and High Field Physics (FIHFP 2004), Kyoto, Japan, April 25-29, 2004, paper P2742.

Montoya, L.

Morse, S. F. B.

L. J. Waxer, D. N. Maywar, J. H. Kelly, T. J. Kessler, B. E. Kruschwitz, S. J. Loucks, R. L. McCrory, D. D. Meyerhofer, S. F. B. Morse, C. Stoeckl, and J. D. Zuegel, Opt. Photonics News 16, 30 (2005).
[CrossRef]

Stoeckl, C.

L. J. Waxer, D. N. Maywar, J. H. Kelly, T. J. Kessler, B. E. Kruschwitz, S. J. Loucks, R. L. McCrory, D. D. Meyerhofer, S. F. B. Morse, C. Stoeckl, and J. D. Zuegel, Opt. Photonics News 16, 30 (2005).
[CrossRef]

Takeda, M.

Waxer, L. J.

L. J. Waxer, D. N. Maywar, J. H. Kelly, T. J. Kessler, B. E. Kruschwitz, S. J. Loucks, R. L. McCrory, D. D. Meyerhofer, S. F. B. Morse, C. Stoeckl, and J. D. Zuegel, Opt. Photonics News 16, 30 (2005).
[CrossRef]

Yaitskova, N.

Zuegel, J. D.

L. J. Waxer, D. N. Maywar, J. H. Kelly, T. J. Kessler, B. E. Kruschwitz, S. J. Loucks, R. L. McCrory, D. D. Meyerhofer, S. F. B. Morse, C. Stoeckl, and J. D. Zuegel, Opt. Photonics News 16, 30 (2005).
[CrossRef]

J. Opt. Soc. Am. (1)

J. Opt. Soc. Am. A (1)

Opt. Lett. (1)

Opt. Photonics News (1)

L. J. Waxer, D. N. Maywar, J. H. Kelly, T. J. Kessler, B. E. Kruschwitz, S. J. Loucks, R. L. McCrory, D. D. Meyerhofer, S. F. B. Morse, C. Stoeckl, and J. D. Zuegel, Opt. Photonics News 16, 30 (2005).
[CrossRef]

Other (2)

N. Miyanaga, presented at the International Workshop on Fast Ignition and High Field Physics (FIHFP 2004), Kyoto, Japan, April 25-29, 2004, paper P2742.

Laboratory for Laser Energetics LLE Review, Rep. 100, NTIS document DOE/SF/19460-578 (2004), p. 242. Copies may be obtained from the National Technical Information Service, Springfield, Va. 22161.

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Figures (5)

Fig. 1
Fig. 1

Placing a M-Z interferometer around the compressor permits monitoring the cumulative phase error.

Fig. 2
Fig. 2

Space–time plots show the effects of π-phase compensation between two gratings within a compressor. Compared with (a) zero beam spreading, (b) a 20% beam spread causes 5% temporal broadening and a few percent increase of spot size. (c) A 100% beam spread shows a greater change to the focal plane intensity.

Fig. 3
Fig. 3

Layout of the tiled-grating compressor, the M-Z and T-G interferometers, and the far-field measuring system. (a) Motorized actuators, (b) IR laser at 1.5 μ m , (c) T-G reference mirror, (d) far-field focusing lens, (e) overlapping gaps. B/S, beam splitter.

Fig. 4
Fig. 4

(a) Encircled energy drifts between 0.79 and 0.87 in the open loop because of thermal changes over a 2 h period. (b) Encircled energy is shown with the control loop engaged and holding steady at 0.87 over a similar time period.

Fig. 5
Fig. 5

Measurement of the system’s impulse response; plots of recovery process for four TGAs aligned in a compressor configuration with an active M-Z control system. The system was aligned and stable; the fourth TGA was deliberately misaligned by 0.35 λ ; piston correction and corresponding encircled energy are shown recovering from the misalignment.

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