Reduction of speckle and interference patterns for laser...

Details Reduction of speckle and interference patterns for laser... Reduction of speckle and interference patterns for laser...

2007-03-20

2007-03-20

Dang, Hung (Department: 2873)

Optical: systems and elements

Optical modulator

Light wave temporal modulation

Reexamination Certificate

active

11097462

ABSTRACT:
The invention provides a system and method for reducing laser speckle and interference patterns in a laser projector display when using a laser projector having a spatial light modulator (SLM) with a defined pixel rate. The method can include the operation of polarizing a laser output of a continuous wave laser such that the laser output is s-polarized with respect to a beam combiner. The s-polarized laser output can be divided into a first laser beam and a second laser beam. A phase of the second laser beam can be modulated with an amplitude sufficient to create a phase delay of approximately half a wavelength of the laser output and at a frequency at least twice that of the SLM's pixel rate.

REFERENCES:
patent: 3633999 (1972-01-01), Buckles
patent: 5982553 (1999-11-01), Bloom et al.
patent: 6094267 (2000-07-01), Levenson et al.
patent: 6323984 (2001-11-01), Trisnadi
Trisnadi, Jahja I., Silicon Light Machines, “speckle contrast reduction in laser projection displays” Sunnyvale, California 94089.
Corbin et al., Silicon Light Machines, “Grating light valve and vehicle displays” Sunnyvale, California.

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