Invention Grant
US08748806B2 Apparatus and method for reducing visibility of speckle in coherent light by homogenization of coherent illumination through a waveguide with a vibratable membrane mirror
失效
用于通过具有可振动膜反射镜的波导通过相干照明的均匀化来降低相干光中斑点可见度的装置和方法
- Patent Title: Apparatus and method for reducing visibility of speckle in coherent light by homogenization of coherent illumination through a waveguide with a vibratable membrane mirror
- Patent Title (中): 用于通过具有可振动膜反射镜的波导通过相干照明的均匀化来降低相干光中斑点可见度的装置和方法
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Application No.: US13146186Application Date: 2010-01-27
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Publication No.: US08748806B2Publication Date: 2014-06-10
- Inventor: Omar Sqalli , Nicolas Descharmes
- Applicant: Omar Sqalli , Nicolas Descharmes
- Applicant Address: IE Dublin
- Assignee: Optyka Limited
- Current Assignee: Optyka Limited
- Current Assignee Address: IE Dublin
- Agency: Shumaker & Sieffert, P.A.
- Priority: GB0901305.3 20090127
- International Application: PCT/EP2010/050947 WO 20100127
- International Announcement: WO2010/086336 WO 20100805
- Main IPC: G01J4/00
- IPC: G01J4/00
Abstract:
An apparatus and method for reducing the visibility of speckle in coherent light comprises propagating the coherent light through a multimode optical waveguide 106 to reduce a coherence length of the coherent light by intermodal dispersion. A vibratable membrane mirror 104 is arranged to reflect the coherent light either before or after passing through the multimode optical fiber further to reduce the coherence length by distributing wave packets across different propagating modes and to erase the modal structure by averaging the distribution of energy across the modes leading to a more uniform illumination. The invention may be used for speckle removal in a laser scanning projector.
Public/Granted literature
- US20120044464A1 SPECKLE REMOVAL FOR A LASER SCANNING PROJECTOR Public/Granted day:2012-02-23
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