Abstract

Images with partial and complete contrast reversal have been retrieved from a single image recorded in a lithium niobate crystal. The input image, a grey tone transparency, is modulated with the help of two diffracted orders of a Ronchi ruling. The same two orders are used to read the crystal. The relative amplitude of these orders is altered with the help of a linear polarizer, and this produces variable tones in the output image. Partially coherent light can be used at both the writing and the reading stages.

© 1981 Optical Society of America

Full Article  |  PDF Article

References

  • View by:
  • |
  • |
  • |

  1. R. Grousson, S. Mallick, Appl. Opt. 19, 1762 (1980).
    [CrossRef] [PubMed]
  2. O. Bryngdahl, J. Opt. Soc. Am. 62, 807 (1972).
    [CrossRef]
  3. N. Nishida, Appl. Opt. 7, 1862 (1968).
    [CrossRef] [PubMed]
  4. K. Biedermann, J. Opt. Soc. Am. 61, 1439 (1971).
    [CrossRef]
  5. F. Bestenreiner, R. Demi, U. Greis, Optik 30, 404 (1970).
  6. H. Kogelnik, Bell Syst. Tech. J. 48, 2909 (1969).

1980 (1)

1972 (1)

1971 (1)

1970 (1)

F. Bestenreiner, R. Demi, U. Greis, Optik 30, 404 (1970).

1969 (1)

H. Kogelnik, Bell Syst. Tech. J. 48, 2909 (1969).

1968 (1)

Bestenreiner, F.

F. Bestenreiner, R. Demi, U. Greis, Optik 30, 404 (1970).

Biedermann, K.

Bryngdahl, O.

Demi, R.

F. Bestenreiner, R. Demi, U. Greis, Optik 30, 404 (1970).

Greis, U.

F. Bestenreiner, R. Demi, U. Greis, Optik 30, 404 (1970).

Grousson, R.

Kogelnik, H.

H. Kogelnik, Bell Syst. Tech. J. 48, 2909 (1969).

Mallick, S.

Nishida, N.

Appl. Opt. (2)

Bell Syst. Tech. J. (1)

H. Kogelnik, Bell Syst. Tech. J. 48, 2909 (1969).

J. Opt. Soc. Am. (2)

Optik (1)

F. Bestenreiner, R. Demi, U. Greis, Optik 30, 404 (1970).

Cited By

OSA participates in CrossRef's Cited-By Linking service. Citing articles from OSA journals and other participating publishers are listed here.

Alert me when this article is cited.


Figures (6)

Fig. 1
Fig. 1

Schematic diagram of writing and reading arrangement.

Fig. 2
Fig. 2

Two reading beams split into four beams on traversing the crystal. Interference is observed between diffracted and direct beams emerging parallel to each other.

Fig. 3
Fig. 3

Orientation of different polarizers used in the reading process.

Fig. 4
Fig. 4

Variations of γ[= (π/λ)αtf(x,y)] for a one-dimensional object. Regions for which γ < β have their contrast reversed.

Fig. 5
Fig. 5

Retrieved images for different values of β.

Fig. 6
Fig. 6

The grey tone in the ouptut image can be continuously varied by progressively varying β. Here β = 0 for the top left image and is increased by 5° for each successive image.

Equations (7)

Equations on this page are rendered with MathJax. Learn more.

E ( x , y ) = f ( x , y ) ( 1 + m cos 2 π N x ) τ ,
Δ n = α E ( x , y ) ,
U ( diffracted beam ) = sin [ π λ cos θ α f ( x , y ) t ] , U ( direct beam ) = cos [ π λ cos θ α f ( x , y ) t ] .
cos ( θ π 4 ) sin [ π λ α t f ( x , y ) ] cos π 4 ,
sin ( θ π 4 ) cos [ π λ α t f ( x , y ) ] cos 3 π 4 .
I ( x , y ) = sin 2 [ π λ α t f ( x , y ) ( θ π 4 ) ] = sin 2 [ π λ α t f ( x , y ) β ] ,
sin θ = ( N λ / 2 ) ,

Metrics