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Speckle suppression in laser display using several partially coherent beams
Seungdo An1, Anatoliy Lapchuk, Victor Yurlov
1OS Division, SOM R&D and Biz. Group, Samsung Electro-Mechanics Co, Ltd, Suwon, Korea. seungdo.an@samsung.com
Optics Express
|January 9, 2009
Summary
This study proposes an optical method using partially coherent beams to reduce speckle in projection systems. A three-beam setup effectively suppresses speckle, especially for larger decorrelation lengths, approaching theoretical limits.
Area of Science:
- Optics
- Image Processing
- Photonics
Background:
- Speckle noise degrades image quality in projection systems.
- Partially coherent light sources are explored for speckle reduction.
Purpose of the Study:
- To propose and evaluate an optical scheme for speckle suppression using partially coherent beams.
- To compare the effectiveness of two-beam versus three-beam configurations for speckle reduction.
Main Methods:
- Utilizing diffractive optical elements (DOEs) to generate multiple beams.
- Employing transparent plates in the Fourier plane for beam decorrelation.
- Applying the coherence matrix algorithm to quantify speckle contrast ratio.
Main Results:
- Two partially coherent beams offer better speckle suppression for small decorrelation lengths.
- Three partially coherent beams provide superior speckle suppression for large decorrelation lengths.
- The three-beam setup achieves suppression coefficients near theoretical limits across three colors.
Conclusions:
- The proposed optical scheme effectively suppresses speckle in projection systems.
- The number of partially coherent beams and decorrelation length significantly impact speckle suppression efficiency.
- A three-beam configuration is recommended for optimal speckle reduction in specific scenarios.
