衍射极限非球面准直透镜

介绍了一种新的非球面透镜设计方法。通过非球面方程中二次曲面常数和非球面系数对光学系统像差的贡献来设计非球面透镜,并详细分析了非球面设计过程。设计了数值孔径NA=0.37, 纤芯Φ=600μm的大光束光纤耦合半导体激光器的非球面准直透镜,其焦距f=50mm。从像质评定可以看出, 非球面准直镜几乎接近衍射极限, 整个系统的波像差小于0.3λ。实验表明： 采用非球面准直系统能最大限度地利用光能率和提高光束准直性, 证明了设计方法基本正确。

Diffraction-limited aspheric collimation lens

A new method of aspheric lens design is introduced. The aspheric lens was designed according to the contribution of the quadric constant and aspheric coefficient in aspheric equation to aberration of optical system,and the design process of aspheric lens was analyzed. The aspheric collimation lens with a focal length of 50 mm was designed for the fiber coupled semiconductor laser with the numerical aperture NA = 0.37 and the fiber-core diameter Φ=600 μm. The evaluation results show that the image quality almost reaches the diffraction limit,wavefront aberration of the collimation optical system is less than 0.3 λ. The experiment results indicate that the aspheric collimation system can maximize the laser efficiency and improve the beam collimation. The validity of the design is proved.