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In order to achieve uniform laser illumination with small aperture diameterand large field Angle,study laser active illumination system.An aspheric mirrorcombined with a composite ellipsoidal cavity is designed to achieve uniformillumination in this paper.Through an aspheric mirror,the fundamental mode ofGaussian beam is shaped into double Gaussian radiation and Flat-topradiation.The double Gaussian radiation rays are reflected again by the complexellipsoidal cavity and decomposed into equal radiation flux,which issuperimposed with the through Flat-top radiation rays to form a uniformdistribution.The parameters of the complex ellipsoidal cavity are obtained bymapping equalization algorithm.After the superposition of the asphericaltransmission Flat-top shaping and the composite ellipsoidal cavity secondaryreflection shaping,the aperture is 29.7mm,whose aperture angle is 84.0degrees,and the uniformity is 92.7% with 2m distance and 3.6m diameter.Theoptimization of uniformity is influenced by three factors:RMS,transmission andreflection power density ratio MT/R and transmission and reflection overlapdegree.RMS and MT/R determine the design effect of the composite ellipsoidalcavity, which depends on the maximum reflection Angle and transmissionAngle.MT/R is negatively correlated with the maximum reflection of Angle,andRMS is positively correlated with the transmission Angle.When the maximumreflection Angle is set to 32.0 degrees and the transmission Angle to 8.0degrees,the minimum root-mean-square focusing radius is 108.6um,and the minimumeffective transmission reflection power density ratio is 1.07.The degreeoverlap of transmission and reflection directly affects the uniformity of thetarget plane.The degree of transmission and reflection is adjusted by settingan adjustment factor.When the adjustment factor is 0.9,the uniformity of thetarget plane reaches the maximum.

Design of laser uniform illumination system based on aspheric lens and compound ellipsoidal cavity