Abstract

A wide field-of-view (FOV), theoretically diffraction-limited imaging system is demonstrated using a single positive lens (a singlet), a reflective liquid crystal spatial light modulator (SLM), a turning mirror and a CCD camera. The SLM is used to correct the off-axis aberrations that would otherwise limit the useful FOV of our system. Foveated imaging refers to the variation in spatial resolution across the image caused by using the SLM in this manner.

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References

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  1. See for example, R.R. Shannon, The art and science of optical design (Cambridge University Press, New York, 1997), Ch. 7.
  2. T. Martinez, D.V. Wick, and S.R. Restaino, "Foveated, wide field-of-view imaging system using a liquid crystal spatial light modulator," Opt. Express 8, 555-560 (2001), http://www.opticsexpress.org/oearchive/source/32932.htm.
    [CrossRef] [PubMed]
  3. D.S. Acton, "Correction of static optical errors in a segmented adaptive optical system," Appl. Opt. 34, 7965-7968 (1995).
    [CrossRef] [PubMed]
  4. See for example, S-TWu, "Nematic Liquid Crystals," Spatial Light Modulator Technology - Materials, Devices, and Applications, U. Efron, ed. (Marcel Dekker, Inc., New York, 1995), Ch. 1.
  5. G. D. Love, "Wave-front correction and production of Zernike modes with a liquid-crystal spatial light modulator," Appl. Opt. 36, 1517-1524 (1997).
    [CrossRef] [PubMed]
  6. P.F. McManamon, E.A. Watson, T. Dorshner, and L.J. Barnes, "Applications look at the use of liquid crystal writable gratings for steering passive radiation," Opt. Eng. 32, 2657-2664 (1993).
    [CrossRef]
  7. N. Tsumura, C. Endo, H. Haneishi, and Y. Miyake, "Image compression and decompression based on gazing area," Proc. SPIE 2657, 361-367 (1996).
    [CrossRef]
  8. W.S. Geisler and J.S. Perry, "A real-time foveated multi-resolution system for low-bandwidth video communication," Proc. SPIE 3299, 294-305 (1998).
    [CrossRef]

Other

See for example, R.R. Shannon, The art and science of optical design (Cambridge University Press, New York, 1997), Ch. 7.

T. Martinez, D.V. Wick, and S.R. Restaino, "Foveated, wide field-of-view imaging system using a liquid crystal spatial light modulator," Opt. Express 8, 555-560 (2001), http://www.opticsexpress.org/oearchive/source/32932.htm.
[CrossRef] [PubMed]

D.S. Acton, "Correction of static optical errors in a segmented adaptive optical system," Appl. Opt. 34, 7965-7968 (1995).
[CrossRef] [PubMed]

See for example, S-TWu, "Nematic Liquid Crystals," Spatial Light Modulator Technology - Materials, Devices, and Applications, U. Efron, ed. (Marcel Dekker, Inc., New York, 1995), Ch. 1.

G. D. Love, "Wave-front correction and production of Zernike modes with a liquid-crystal spatial light modulator," Appl. Opt. 36, 1517-1524 (1997).
[CrossRef] [PubMed]

P.F. McManamon, E.A. Watson, T. Dorshner, and L.J. Barnes, "Applications look at the use of liquid crystal writable gratings for steering passive radiation," Opt. Eng. 32, 2657-2664 (1993).
[CrossRef]

N. Tsumura, C. Endo, H. Haneishi, and Y. Miyake, "Image compression and decompression based on gazing area," Proc. SPIE 2657, 361-367 (1996).
[CrossRef]

W.S. Geisler and J.S. Perry, "A real-time foveated multi-resolution system for low-bandwidth video communication," Proc. SPIE 3299, 294-305 (1998).
[CrossRef]

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Figures (4)

Fig. 1.
Fig. 1.

Optical layout for foveated imaging system with up to a 25° field-of-view

Fig. 2.
Fig. 2.

Foveated imaging experiment

Fig. 3.
Fig. 3.

Images of checkerboard transparency. For each image, the left edge corresponds to a 25° field angle in x and the right edge to a 10 ° field angle in x (see Fig. 1). The voltages schemes applied to the SLM are (a) none, (b) correction at 10° in x (0° in y), and (c) correction at 25° in x (0° in y)

Fig. 4.
Fig. 4.

Images of a 25 μm pinhole at a 25° field angle (a) uncorrected, (b) corrected, and (c) corrected with camera gain reduced by a factor of four to avoid saturation.

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