<p>An optical system (100) comprises a coherent light source (101) and optical elements for directing light from the source to a target (1001). The optical elements include at least one diffusing element (141, 161) arranged to reduce a coherence volume of light from the source and a variable optical property element (151). A control system (1021) controls the variable optical property element such that different speckle patterns are formed over time at the target (1001) with a temporal frequency greater than a temporal resolution of an illumination sensor or an eye (1011) of an observer so that speckle contrast ratio in the observed illumination is reduced. The variable optical property element (151) may be a deformable mirror with a vibrating thin plate or film.</p>
申请公布号
WO2009077198(A2)
申请公布日期
2009.06.25
申请号
WO2008EP10867
申请日期
2008.12.18
申请人
OPTYKA LIMITED;SHEVLIN, FERGAL PATRICK;SQALLI, OMAR;DESCHARMES, NICOLAS
发明人
SHEVLIN, FERGAL PATRICK;SQALLI, OMAR;DESCHARMES, NICOLAS