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13 September 2010 Polymer-based multiple diffraction modulator for speckle reduction
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Proceedings Volume 7387, Speckle 2010: Optical Metrology; 73871F (2010)
Event: Speckle 2010, 2010, Florianapolis, Brazil
We report a polymer based multiple diffraction modulator, in which PDMS (polydimethylsiloxane) is utilized as the actuation material, for speckle reduction. The properties of the PDMS are characterized based on its response time and deformability, which are the key properties concerned in this work. The structure dependent properties of PDMS are discussed. Using the described technique, the PDMS satisfy the system demand. The modulator is used to create real-time diffraction patterns by dynamic gratings formed by flexible PDMS. The diffracted light passes through a diffuser, which is placed after the modulator, and induces speckle patterns on the screen. Speckle-reduction is achieved by adding the time-varying speckle patterns in the integration time of the detector. It is observed that using the modulator which has two gratings, the speckle contrast ratio reaches to 50%, which shows fair agreement with the simulation.
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G. Ouyang, Z. Tong, W. Gao, K. Wang, M. N. Akram, V. Kartashov, and X. Y. Chen "Polymer-based multiple diffraction modulator for speckle reduction", Proc. SPIE 7387, Speckle 2010: Optical Metrology, 73871F (13 September 2010);

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