一种多波长激光雷达光学系统设计

Design of a multi-wavelength lidar optical system

鉴于大口径激光雷达系统在污染物检测方面的需求,理论设计了一种多波长激光雷达光学系统。该系统由接收主系统和光纤分束耦合部分组成,工作波长为355、532、1064 nm,检测波长为632.8 nm,接收主系统采用卡塞格林结构,光纤分束耦合部分采用透射的形式,引入色差。系统通光口径为Φ680 mm,有效焦距为1548.53 mm,通过对玻璃材料的选型和光焦度分配,使用修正的相对部分色散P和阿贝数V建立消色差方程组,用PW法求解初始结构。使用Zemax软件优化出满足要求的光学系统,最终优化结果波前都优于λ/15(λ=632.8 nm),表明设计的光学系统可用于实际生产加工中。

In view of the requirements of large aperture lidar system in pollutant detection,a multiwavelength lidar optical system is designed theoretically.The system is composed of the main receiving system and the fiber splitting coupling part,and its working wavelengths are 355,532,1064 nm,and the detection wavelength is 632.8 nm.The main receiving system adopts Cassegrain structure,and the fiber splitting coupling part adopts transmissive form to introduce chromatic aberration.The clear aperture of the system is Φ680 mm,and the effective focal length is 1548.53 mm.Through the selection of glass material and the distribution of optical power,the achromatic equations are established by using the corrected relative partial dispersion P and Abbe number V,and the preliminary structure is solved by PW method.The optical system is optimized by Zemax software to meet the requirements,and the final optimization results are better than λ/15(λ=632.8 nm),which indicates that the designed optical system can be used in actual production and processing.