半导体激光激发荧光粉转换白光照明系统设计

单管蓝光半导体激光器功率相对较低，为了获得高功率激光，利用多单管光纤耦合技术实现10 W蓝光激光输出，输出的激光激发荧光粉片合成的白光光源作为汽车远光灯光源。根据汽车照明法规要求设计了汽车远光灯照明系统并详述了抛物面反光罩、双凹透镜和荧光粉片的光学结构及对反光罩曲线参数、双凹透镜和荧光粉片的放置位置对光源色温均匀性及照度的影响。模拟设计了顶端19 mm×31.6 mm椭圆形开孔、底部直径5 mm圆形开孔、高60 mm的椭圆抛物面反光罩，荧光粉片置于距反光罩底部15 mm处时，在距光源25 m处的接收面上得到了5 m×12 m的椭圆光斑，白光光源的光通量为1 025 lm，中心色温为5 880 K，中心色坐标为(x=0.322 6，y=0.369 2)，该汽车远光灯照明系统满足汽车照明法规要求。

Design of phosphor-converted white light illumination system simulated by semiconductor laser

The power of single-tube blue semiconductor laser is relatively low. In order to obtain high power laser output, the multi-tube fiber coupling technology was used to achieve 10 W blue laser output, and the white light source output synthetized by laser excitation phosphor sheet was taken as the car high beam light source.According to the requirements of automotive lighting regulations, an automobile high beam lighting system was designed, the optical structures of parabolic reflecting shade, biconcave lens and phosphor sheet as well as the influence of reflecting shade curve parameters, the positions of biconcave lens and phosphor sheet on the color temperature uniformity and illuminance of light source were described in detail.A elliptical parabolic reflecting shade with an elliptical opening of 19 mm×31.6 mm at the top, a circular opening of 5 mm diameter at the bottom and with the height of 60 mm was designed.When the phosphor sheet was placed at a distance of 15 mm from the reflector bottom, an elliptical spot of 5 m×12 m was obtained on the receiving surface 25 m from the light source, the white light source had a luminous flux of 1 025 lm and a center color temperature of 5 880 K, the central color coordinates were (x=0.322 6, y=0.369 2).Results show that the high beam lighting system meets the requirements of automobile lighting regulations.