Abstract

A novel optical line focus system using a lens and off-axis mirror combination which allows a high quality line focus to be obtained has been developed for x-ray laser research. By irradiation of fiber and thin foil targets with a high power laser various experimental observations show the excellent performance of this new scheme.

© 1987 Optical Society of America

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References

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  1. I. N. Ross, E. M. Hodgson, “Some Optical Designs for the Generation of High Quality Line Foci,” J. Phys. E 18, 169 (1985).
    [CrossRef]
  2. D. J. Nicholas, C. Pataky, W. T. Welford, “High Aperture Lens for Laser Compression Experiments: a New Type,” Appl. Opt. 17, 3368 (1978).
    [CrossRef] [PubMed]
  3. Annual Report to the Laser Facility Committee 1986, RAL-86-046.

1985 (1)

I. N. Ross, E. M. Hodgson, “Some Optical Designs for the Generation of High Quality Line Foci,” J. Phys. E 18, 169 (1985).
[CrossRef]

1978 (1)

Appl. Opt. (1)

J. Phys. E (1)

I. N. Ross, E. M. Hodgson, “Some Optical Designs for the Generation of High Quality Line Foci,” J. Phys. E 18, 169 (1985).
[CrossRef]

Other (1)

Annual Report to the Laser Facility Committee 1986, RAL-86-046.

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Figures (9)

Fig. 1
Fig. 1

Principle of line focus optical design: (a) generalized optical system for the generation of line foci; (b) simple example of a refractive system giving a line focus.

Fig. 2
Fig. 2

Schematic of the mirror line focus design.

Fig. 3
Fig. 3

Design curves for the mirror line focus scheme: (a) dependence of the line focus length (L) on the mirror tilt angle (θ); (b) accuracy of the simple scaling law.

Fig. 4
Fig. 4

Line focus design using refractive optics.

Fig. 5
Fig. 5

Uniform deposition of energy along the line focus: (a) line focus intensity distribution using a rectangular beam aperture; (b) uniform and sharp ended intensity distribution using an optimized aperture.

Fig. 6
Fig. 6

Schematic of the experimental arrangement showing multibeam illumination and diagnostics.

Fig. 7
Fig. 7

Split-field target imaging system: (a) schematic of the complete system showing the principal rays for each of the two fields; (b) detail of the viewing optics to enable accurate target alignment.

Fig. 8
Fig. 8

Spatial intensity profile of the transmitted laser beam: (a) with fiber aligned; (b) with no fiber target.

Fig. 9
Fig. 9

X-ray images of targets illuminated by the line focus (energy band ~ 1 keV): (a) carbon fiber; (b) selenium foil.

Equations (4)

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L R 1.4 × 10 - 4 θ 2 F cos θ
L D 1.4 × 10 - 4 θ 2 ,
L 0.57 t tan 2 α F ( 1 + 6 t α 2 R ) ,
u = f ( f + R sin θ / 2 · tan θ ) R sin θ / 2 · tan θ .

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