论文信息 - Speckle reduction using a motionless diffractive optical element.

Speckle reduction using a motionless diffractive optical element.

Speckle reduction by moving diffuser has been previously studied in display systems with coherent light sources, such as lasers. In this Letter, we propose a motionless diffractive optical element (DOE) for speckle reduction. The DOE was designed based on finite-element method simulations, fabricated using micromachining technology, and characterized for despeckle efficiency. Experiments using a DOE with two gratings have indicated that the speckle was suppressed to 50%, which shows fair agreement with theoretical analysis. With some modification of this DOE, the speckle noise can be reduced to 10% according to the theory.

[1] Denis Joyeux,et al. Speckle Removal by a Slowly Moving Diffuser Associated with a Motionless Diffuser , 1971 .

[2] Xuyuan Chen,et al. Simulation of laser speckle reduction by using an array of diffraction gratings , 2010, Speckle: International Conference on Speckle Metrology.

[3] Benny Svardal,et al. Image improvement in a laser projection display with a spatial light modulator with a deformable polymer , 2009 .

[4] Zhaomin Tong,et al. Speckle reduction in line-scan laser projectors using binary phase codes. , 2010, Optics letters.

[5] Anatoliy Lapchuk,et al. Speckle suppression in laser display using several partially coherent beams. , 2009, Optics express.

[6] Kaiying Wang,et al. A novel tunable grating fabricated with viscoelastic polymer (PDMS) and conductive polymer (PEDOT) , 2010 .

[7] Muhammad Nadeem Akram,et al. Speckle suppression in projection displays by using a motionless changing diffuser. , 2010, Journal of the Optical Society of America. A, Optics, image science, and vision.

[8] Jahja I. Trisnadi. Hadamard speckle contrast reduction. , 2004, Optics letters.

[9] Muhammad Nadeem Akram,et al. Fabrication and characterization of polymer based spatial light modulators , 2009, Optical Engineering + Applications.