Abstract

The efficiency with which information may be recovered from a phase object is shown to be greater when the object is inserted into a laser cavity than when it is illuminated passively by the same laser. The parameters of both the laser and object which affect this efficiency are discussed. Examples of information processed in coherent, as well as in partially coherent, light are presented.

© 1967 Optical Society of America

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References

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  1. R. V. Pole, H. Wieder, E. S. Barrekette, Appl. Opt. 6, 1571 (1967).
    [CrossRef] [PubMed]
  2. See, for example, M. Born, E. Wolf, Principles of Optics (Pergamon Press, New York, 1959), p. 607.
  3. H. Wieder, R. A. Myers, C. L. Fisher, C. G. Powell, J. Colombo, Rev. Sci. Instr. 38, Oct. (1967).
    [CrossRef]
  4. Ref. 2, p. 503.
  5. D. R. Herriott, J. Opt. Soc. Am. 56, 719 (1966).
    [CrossRef]
  6. R. A. Myers, private communication.
  7. See, for example, G. Birnbaum, Advances in Electronics and Electron Physics, Suppl. 2, Optical Masers (Academic Press, New York, 1964), p. 86, et seq.

1967 (2)

R. V. Pole, H. Wieder, E. S. Barrekette, Appl. Opt. 6, 1571 (1967).
[CrossRef] [PubMed]

H. Wieder, R. A. Myers, C. L. Fisher, C. G. Powell, J. Colombo, Rev. Sci. Instr. 38, Oct. (1967).
[CrossRef]

1966 (1)

Barrekette, E. S.

Birnbaum, G.

See, for example, G. Birnbaum, Advances in Electronics and Electron Physics, Suppl. 2, Optical Masers (Academic Press, New York, 1964), p. 86, et seq.

Born, M.

See, for example, M. Born, E. Wolf, Principles of Optics (Pergamon Press, New York, 1959), p. 607.

Colombo, J.

H. Wieder, R. A. Myers, C. L. Fisher, C. G. Powell, J. Colombo, Rev. Sci. Instr. 38, Oct. (1967).
[CrossRef]

Fisher, C. L.

H. Wieder, R. A. Myers, C. L. Fisher, C. G. Powell, J. Colombo, Rev. Sci. Instr. 38, Oct. (1967).
[CrossRef]

Herriott, D. R.

Myers, R. A.

H. Wieder, R. A. Myers, C. L. Fisher, C. G. Powell, J. Colombo, Rev. Sci. Instr. 38, Oct. (1967).
[CrossRef]

R. A. Myers, private communication.

Pole, R. V.

Powell, C. G.

H. Wieder, R. A. Myers, C. L. Fisher, C. G. Powell, J. Colombo, Rev. Sci. Instr. 38, Oct. (1967).
[CrossRef]

Wieder, H.

H. Wieder, R. A. Myers, C. L. Fisher, C. G. Powell, J. Colombo, Rev. Sci. Instr. 38, Oct. (1967).
[CrossRef]

R. V. Pole, H. Wieder, E. S. Barrekette, Appl. Opt. 6, 1571 (1967).
[CrossRef] [PubMed]

Wolf, E.

See, for example, M. Born, E. Wolf, Principles of Optics (Pergamon Press, New York, 1959), p. 607.

Appl. Opt. (1)

J. Opt. Soc. Am. (1)

Rev. Sci. Instr. (1)

H. Wieder, R. A. Myers, C. L. Fisher, C. G. Powell, J. Colombo, Rev. Sci. Instr. 38, Oct. (1967).
[CrossRef]

Other (4)

Ref. 2, p. 503.

See, for example, M. Born, E. Wolf, Principles of Optics (Pergamon Press, New York, 1959), p. 607.

R. A. Myers, private communication.

See, for example, G. Birnbaum, Advances in Electronics and Electron Physics, Suppl. 2, Optical Masers (Academic Press, New York, 1964), p. 86, et seq.

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Figures (5)

Fig. 1
Fig. 1

A generalized, multimode flat field conjugate resonator. A phase object or mode limiting aperture is placed in the plane ∑, which is the common focal plane of the lenses. Use of a small aperture in this plane produces a single transverse mode, with plane parallel beams in regions A and D, and converging beams in regions B and C. A folded, single-mode cavity is obtained by moving mirror M2 in contact with the aperture at ∑.

Fig. 2
Fig. 2

Photograph of a hologram processed inside the laser cavity.

Fig. 3
Fig. 3

(a) Interference pattern of a microscope slide placed in a Twyman-Green interferometer. (b) Interference pattern of the same slide placed in the single mode laser cavity.

Fig. 4
Fig. 4

(a) Image projected out of the laser cavity when a jet stream of air is blown into the cavity. (b) Same as Fig. 5(a), except that the laser has been misaligned so as to be turned off when the jet stream is absent.

Fig. 5
Fig. 5

(a) Experimental arrangement for producing an image of a thermoplastic recording, using the full set of transverse modes of the laser. Only the image formed by light traveling in a counterclockwise direction is represented. (b) Image projected out of the cavity by a thermoplastic recording placed inside the laser.

Equations (4)

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P 1 = γ t [ P p / ( γ t + γ c + γ c ) - C ] ,
P 1 = ( 1 - γ c ) γ t [ ( P p ) ½ - ( C γ c ) ½ ] 2 ,
Δ P 1 / P 1 = - Δ γ c γ [ 1 - ( C γ / P p ) ] ,
Δ P 1 / P 1 = - Δ γ c / ( 1 - γ c ) .

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