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.
© 2010 Optical Society of America
Original Manuscript: November 16, 2009
Revised Manuscript: December 16, 2009
Manuscript Accepted: December 17, 2009
Published: January 29, 2010
M. Nadeem Akram, Vladimir Kartashov, and Zhaomin Tong, "Speckle reduction in line-scan laser projectors using binary phase codes," Opt. Lett. 35, 444-446 (2010)