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Method of speckle-noise pattern reduction and apparatus therefor based on reducing the temporal coherence of the planar laser illumination beam before it illuminates the target object by applying temporal intensity modulation techniques during the transmission of the PLIB towards the target

  • US 20030071123A1
  • Filed: 04/30/2002
  • Published: 04/17/2003
  • Est. Priority Date: 06/07/1999
  • Status: Active Grant
First Claim
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1. A planar light illumination module (PLIM) of compact construction for producing a planar laser illumination beam (PLIB) which emanates substantially within a single plane along the direction of beam propagation towards an object to be optically illuminated, said PLIM comprising:

  • a module housing having an axial extent, first and second end portions, a central bore formed along its axial extent, and a wedge-like recess integrally formed in said second end portion;

    a visible laser diode (VLD) mounted along said bore at said first end portion of said module housing, for producing a laser beam generally along said axial extent;

    a focusing lens mounted along said bore between said first and second end portions, for focusing said laser beam to a predetermined focal point; and

    a laser beam expansion element mounted within said wedge-like recess at said second end portion of said module housing, and expanding said laser beam along a predetermined direction and producing a substantially planar laser illumination beam from said beam expansion component.

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