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Speckle reduction in laser projection using a dynamic deformable mirror.

Authors :
Tran TK
Chen X
Svensen Ø
Akram MN
Source :
Optics express [Opt Express] 2014 May 05; Vol. 22 (9), pp. 11152-66.
Publication Year :
2014

Abstract

Despite of much effort and significant progress in recent years, speckle removal is still a challenge for laser projection technology. In this paper, speckle reduction by dynamic deformable mirror was investigated. Time varying independent speckle patterns were generated due to the angle diversity introduced by the dynamic mirror, and these speckle patterns were averaged out by the camera or human eyes, thus reducing speckle contrast in the final image. The speckle reduction by the wavelength diversity of the lasers was also studied. Both broadband lasers and narrowband laser were used for experiment. It is experimentally shown that speckle suppression can be attained by the widening of the spectrum of the lasers. Lower speckle contrast reduction was attained by the wavelength diversity for narrowband laser compared to the broadband lasers. This method of speckle reduction is suitable in laser projectors for wide screen applications where high power laser illumination is needed.

Details

Language :
English
ISSN :
1094-4087
Volume :
22
Issue :
9
Database :
MEDLINE
Journal :
Optics express
Publication Type :
Academic Journal
Accession number :
24921813
Full Text :
https://doi.org/10.1364/OE.22.011152