发明授权
- 专利标题: Retarder-based despeckle device for laser illumination systems
- 专利标题(中): 用于激光照明系统的基于减速器的去斑装置
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申请号: US12424168申请日: 2009-04-15
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公开(公告)号: US07715084B2公开(公告)日: 2010-05-11
- 发明人: Kim L. Tan , David M. Shemo , Scott McEldowney
- 申请人: Kim L. Tan , David M. Shemo , Scott McEldowney
- 申请人地址: US CA Milpitas
- 专利权人: JDS Uniphase Corporation
- 当前专利权人: JDS Uniphase Corporation
- 当前专利权人地址: US CA Milpitas
- 代理机构: Pequignot + Myers LLC
- 代理商 Matthew A. Pequignot
- 主分类号: G02F1/01
- IPC分类号: G02F1/01 ; H01S3/10
摘要:
A method and apparatus for reducing speckle in a laser illumination system uses a despeckle device including an optical retarder providing an odd integer multiple of substantially half-wave retardation for light emitted from a coherent laser in the laser illumination system. The near half-wave optical retarder has a substantially constant retardance and a spatially varied slow axis. The spatially varied slow axis imposes a phase mask on the beam of light, which provides sub-resolution optical phase modulation to a resolution spot on the detector. The near half-wave optical retarder is actuated mechanically or electrically to vary the sub-resolution optical phase modulation within an integration time of the detector.