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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 45, Iss. 13 — May. 1, 2006
  • pp: 3136–3143

Spiking voltages for faster switching of nematic liquid-crystal light modulators

Xiaodong Xun, Doo Jin Cho, and Robert W. Cohn  »View Author Affiliations


Applied Optics, Vol. 45, Issue 13, pp. 3136-3143 (2006)
http://dx.doi.org/10.1364/AO.45.003136


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Abstract

Electrical address circuits developed for driving fast-switching ferroelectric liquid-crystal spatial light modulators (SLM) can be programmed to increase the speed of much slower responding nematic liquid-crystal SLMs. Using an addressing circuit that can switch as fast as 0.164   ms , voltages are programmed for values of phase that exceed the desired phase, and when the phase reaches the desired value, the voltage is switched to the required steady-state voltage. For a SLM that has a phase range of 3.5 π and that is programmed over a 2 π range, switching speed is reduced from 400   ms to between 71 and 77  ms . The speedup algorithm is applied to each pixel of the SLM together with a digital correction for a spatially nonuniform phase.

© 2006 Optical Society of America

OCIS Codes
(050.1970) Diffraction and gratings : Diffractive optics
(070.2580) Fourier optics and signal processing : Paraxial wave optics
(230.3720) Optical devices : Liquid-crystal devices
(230.6120) Optical devices : Spatial light modulators

ToC Category:
Optical Devices

History
Original Manuscript: May 4, 2005
Revised Manuscript: August 19, 2005
Manuscript Accepted: September 7, 2005

Citation
Xiaodong Xun, Doo Jin Cho, and Robert W. Cohn, "Spiking voltages for faster switching of nematic liquid-crystal light modulators," Appl. Opt. 45, 3136-3143 (2006)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-45-13-3136


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References

  1. Boulder Nonlinear Systems, Inc.; http://www.bnonlinear.com/products/XYphase/data/XYPhase.pdf
  2. P. J. Bos and K. R. Beran, "The pi-cell, a fast liquid-crystal optical switching device," Mol. Cryst. Liq. Cryst. 113, 329-339 (1984). [CrossRef]
  3. A. K. Kirby and G. D. Love, "Fast, large and controllable phase modulation using dual frequency liquid crystals," Opt. Express 12, 1470-1475 (2004). [CrossRef] [PubMed]
  4. S. T. Wu and C. S. Wu, "High-speed liquid-crystal modulators using transient nematic effect," J. Appl. Phys. 65, 527-532 (1989). [CrossRef]
  5. J. E. Stockley, Boulder Nonlinear Systems, 450 Courtney Way, No. 107, Lafayette, Colo. 80026 (personal communication, 2005).
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  7. D. J. Cho, S. T. Thurman, J. T. Donner, and G. M. Morris, "Characteristics of a 128 × 128 liquid-crystal spatial light modulator for wave-front generation," Opt. Lett. 23, 969-971 (1998). [CrossRef]
  8. X. Xun and R. W. Cohn, "Phase calibration of spatially nonuniform spatial light modulators," Appl. Opt. 43, 6400-6406 (2004). [CrossRef] [PubMed]
  9. S. T. Wu, "Liquid Crystals" in Handbook of Optics Vol. 2, M.Bass, E.W.Van Stryland, D.R.Williams, and W.L.Wolfe, eds. (McGraw-Hill, 1995), Chap. 14, pp. 14.12-14.17.
  10. R. W. Cohn, "Fundamental properties of spatial light modulators for the approximate optical computation of Fourier transformations: a review," Opt. Eng. 40, 2452-2463 (2001). [CrossRef]
  11. A video (avi format) at http://pyramid.spd.louisville.edu/∼eri/paperslowbarpres/speedup.avi shows the transient diffraction patterns with a 70 ms spiking frame without spiking (movie on left) and with spiking (movie on right). Figures 7(a) and 7(b) shows steady state images with the same field of view as the two movies in the avi file.
  12. X. Xun, X. Chang, and R. W. Cohn, "System for demonstrating arbitrary multi-spot beam steering from spatial light modulators," Opt. Express 12, 260-268 (2004). [CrossRef] [PubMed]

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