Speckle reduction in line-scan laser projectors using binary phase codes.
A Barker binary phase code of maximum length 13 has previously been used for speckle reduction in line-scan laser projectors, and a speckle contrast factor decrease down to 13% has been achieved. In this Letter, Barker-like binary phase codes of lengths longer than 13 are used at an intermediate image plane. It is shown by theoretical calculation that a much better speckle reduction with a speckle contrast factor up to 6% can be achieved by using longer binary phase codes other than the Barker code.
Akram
M Nadeem
MN
University College Vestfold, Institute of Microsystems Technology, N3103 Tønsberg, Norway. mna@hive.no
Kartashov
Vladimir
V
Tong
Zhaomin
Z