Laser speckle reduction based on angular diversity induced by Piezoelectric Benders

G. Ouyang; M. N. Akram; K. Wang; Z. Tong; X. Y. Chen

doi:10.2971/jeos.2013.13025

Journal of the European Optical Society - Rapid publications, Vol 8 (2013)

Laser speckle reduction based on angular diversity induced by Piezoelectric Benders

G. Ouyang, M. N. Akram, K. Wang, Z. Tong, X. Y. Chen

Abstract

Speckle reduction techniques have been investigated in display systems with coherent light sources. We propose a simple but efficient method to reduce speckle via two fast vibrating piezoelectric benders. The concept is modulating laser beams to have angle diversity and reducing speckle by temporal averaging in the integration time of the detector. Experiments demonstrate that the speckle contrast is suppressed down to 0.06. Both free space and imaging geometry are considered. In order to fairly evaluate the speckle reduction, the optical configuration as well as the camera settings, which largely affect the speckle contrast, is discussed.

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References

J. W. Goodman, Speckle phenomena in optics: theory and applications (Roberts & Company Publishers, Greenwood Village, 2007).

J. I. Trisnadi, ”Hadamard speckle contrast reduction,” Opt. Lett. 29, 11–13 (2004).

S. Lowenthal, and D. Joyeux, ”Speckle removal by slowly moving diffuser associated with a motionless diffuser,” J. Opt. Soc. Am. A. 61, 847–851 (1971).

S. Kubota, and J. W. Goodman, ”Very efficient speckle contrast reduction realized by moving diffuser device,” Appl. Optics 49(23), 4385–4391 (2010).

Y. Kuratomi, K. Sekiya, H. Satoh, T. Tomiyama, T. Kawakami, B. Katagiri, Y. Suzuki, and T. Uchida, ”Speckle reduction mechanism in laser rear projection displays using a small moving diffuser,” J. Opt. Soc. Am. A 27(8), 1812–1817 (2010).

M. N. Akram, V. Kartashov, and Z. Tong, ”Speckle reduction in line-scan laser projectors using binary phase codes,” Opt. Lett. 35, 444–446 (2010).

M. N. Akram, Z. Tong, G. Ouyang, X. Chen, and V. Kartashov, ”Laser speckle reduction due to spatial and angular diversity introduced by fast scanning micromirror,” Appl. Optics 49(17), 3297–3304 (2010).

Z. Tong, X. Chen, M. N. Akram, and A. Aksnes, ”Compound Speckle Characterization Method and Reduction by Optical Design,” J. Display Technol. 8(3), 132–137 (2012).

V. Kartashov, and M. N. Akram, ”Speckle suppression in projection displays by using a motionless changing diffuser,” J. Opt. Soc. Am. A 27(12), 2593–2601 (2010).

G. Ouyang, Z. Tong, M. N. Akram, K. Wang, V. Kartashov, X. Yan, and X. Chen, ”Speckle reduction using a motionless diffractive optical element,” Opt. Lett. 35(17), 2852–2854 (2010).

D. S. Mehta, D. N. Naik, R. K. Singh, and M. Takeda, ”Laser speckle reduction by multimode optical fiber bundle with combined temporal, spatial, and angular diversity,” Appl. Optics 51(12), 1894–1904 (2012).

H. Woosung, L. Sejin, O. Kyunghwan, J. Yongmin, and K. K. Jun, ”Speckle Reduction in Near-field Image of Multimode Fiber with a Piezoelectric Transducer,” J. Opt. Soc. Korea 12(3), 126–130 (2008).

H. Woosung, L. Sejin, O. Kyunghwan, J. Yongmin, and K. K. Jun, ”Acousto-optic control of speckle contrast in multimode fibers with a cylindrical piezoelectric transducer oscillating in the radial direction,” Opt. Express 17(20), 17536–17546 (2009).

G. Cloud, ”Optical Methods in Experimental Mechanics,” Exp. Techniques 31(3), 19–22 (2007).