Abstract

A new method for speckle reduction is presented based on the principle of space and wavelength diversity using a current modulated laser and a spectrometer as part of the illumination system.

© 1990 Optical Society of America

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References

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  1. T. S. McKechnie, “Speckle Reduction,” in Laser Speckle and Related Phenomena, J. C. Dainty, Ed. (Springer-Verlag, Heidelberg, 1984).
  2. N. George, A. Jain, “Speckle Reduction Using Multiple Tones of Illumination,” Appl. Opt. 12, 1202–1212 (1973).
    [CrossRef] [PubMed]
  3. W. Martienssen, S. Spiller, “Holographic Reconstruction Without Granulation,” Phys. Lett. A 24, 126–127 (1967).
    [CrossRef]
  4. D. Leger, E. Mathieu, J. C. Perrin, “Optical Surface Roughness Determination Using Speckle Correlation Technique,” Appl. Opt. 14, 872–877 (1975).
    [CrossRef] [PubMed]
  5. C. S. Ih, L. A. Baxter, “Improved Random Spatial Phase Modulation for Speckle Elimination,” Appl. Opt. 17, 1447–1454 (1978).
    [CrossRef] [PubMed]
  6. Y. Imai, M. Imai, Y. Ohtsuka, “Optical Coherence Modulation by Ultrasonic Waves. 2: Application to Speckle Reduction,” Appl. Opt. 19, 3541–3544 (1980).
    [CrossRef] [PubMed]
  7. J. W. Goodman, “Statistical Properties of Laser Speckle Patterns,” in Laser Speckle and Related Phenomena, J. C. Dainty, Ed. (Springer-Verlag, Heidelberg, 1984).
  8. G. W. Stroke, “Ruling, Testing and Use of Optical Gratings for High Resolution Spectroscopy,” Prog. Opt. 2, 3–72 (1963).

1980 (1)

1978 (1)

1975 (1)

1973 (1)

1967 (1)

W. Martienssen, S. Spiller, “Holographic Reconstruction Without Granulation,” Phys. Lett. A 24, 126–127 (1967).
[CrossRef]

1963 (1)

G. W. Stroke, “Ruling, Testing and Use of Optical Gratings for High Resolution Spectroscopy,” Prog. Opt. 2, 3–72 (1963).

Baxter, L. A.

George, N.

Goodman, J. W.

J. W. Goodman, “Statistical Properties of Laser Speckle Patterns,” in Laser Speckle and Related Phenomena, J. C. Dainty, Ed. (Springer-Verlag, Heidelberg, 1984).

Ih, C. S.

Imai, M.

Imai, Y.

Jain, A.

Leger, D.

Martienssen, W.

W. Martienssen, S. Spiller, “Holographic Reconstruction Without Granulation,” Phys. Lett. A 24, 126–127 (1967).
[CrossRef]

Mathieu, E.

McKechnie, T. S.

T. S. McKechnie, “Speckle Reduction,” in Laser Speckle and Related Phenomena, J. C. Dainty, Ed. (Springer-Verlag, Heidelberg, 1984).

Ohtsuka, Y.

Perrin, J. C.

Spiller, S.

W. Martienssen, S. Spiller, “Holographic Reconstruction Without Granulation,” Phys. Lett. A 24, 126–127 (1967).
[CrossRef]

Stroke, G. W.

G. W. Stroke, “Ruling, Testing and Use of Optical Gratings for High Resolution Spectroscopy,” Prog. Opt. 2, 3–72 (1963).

Appl. Opt. (4)

Phys. Lett. A (1)

W. Martienssen, S. Spiller, “Holographic Reconstruction Without Granulation,” Phys. Lett. A 24, 126–127 (1967).
[CrossRef]

Prog. Opt. (1)

G. W. Stroke, “Ruling, Testing and Use of Optical Gratings for High Resolution Spectroscopy,” Prog. Opt. 2, 3–72 (1963).

Other (2)

T. S. McKechnie, “Speckle Reduction,” in Laser Speckle and Related Phenomena, J. C. Dainty, Ed. (Springer-Verlag, Heidelberg, 1984).

J. W. Goodman, “Statistical Properties of Laser Speckle Patterns,” in Laser Speckle and Related Phenomena, J. C. Dainty, Ed. (Springer-Verlag, Heidelberg, 1984).

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Figures (3)

Fig. 1
Fig. 1

Time accumulated emission spectrum of the HL8312E laser under triangular modulation at (a) zero modulation, (b) 100 Hz, and (c) 1 MHz.

Fig. 2
Fig. 2

Experimental setup for optical noise reduction by wavelength and space diversity.

Fig. 3
Fig. 3

Images of a resolution chart under (a) zero modulation and (b) 120-Hz modulation.

Equations (1)

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2 a = 2 f M tan θ λ 0 j = 1 N - 1 Δ λ j + 1 , j ,

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