基于双复眼透镜的三基色激光合成均匀白光束

Homogenized White Light Beam Generated by Red, Green and Blue Lasers Based on Double Fly-Eye Lens

为获得高亮度均匀白光束,基于复眼透镜光束匀化原理,设计了一套以三基色半导体激光器为光源的双复眼透镜光束匀化合成光学系统。该系统包含两套复眼透镜模组,第一套模组将分立三基色激光束聚焦合成均匀白光斑,第二套模组将白光斑转换为空间均匀白光束。对系统进行仿真,并对空间不同位置处的光分布进行照度和色度均匀性分析,结果表明所得光束为均匀白光束,理论上验证了该光学系统的可行性。搭建了实验光路,分别在距离系统1、2、5 m处对合成白光束进行测量,结果表明合成光束照度均匀性均大于90%,色坐标标准差均小于0.0027。该光学系统合成的白光束具有亮度高、色坐标和强度分布均匀等优势,有望在医用光疗、显示、车用照明等领域得到广泛应用。

In order to obtain uniform white light beam of high luminance, a kind of homogenized beam combination system is designed based on fly-eye lenses, the light sources consist of red, green and blue semiconductor lasers. There are two fly-eye lenses modules in the optical path, the first one is used to generate uniform white light spot, while the second one is used to transform the white light spot into spatially uniform white beam. The optical tracing software is used to simulate the optical path, and the luminance and color uniformity of light distribution at different locations in space are analyzed. The simulation results show that uniform white light beam is obtained, and the feasibility of the optical system is verified theoretically. The experimental facility is set up, and the color spectrometer is used to measure the combined white beam at the distances of 1, 2, 5 m. The test results show that the illumination uniformity is greater than 90%, and color coordinate standard deviation is less than 0.0027. The uniform white light beam combined by this optical path can be widely applied to medical phototherapy, display and automotive lighting, with the advantages of high luminance and uniformity in color coordinates and spatial intensity.