中国物理B ›› 2022, Vol. 31 ›› Issue (7): 74210-074210.doi: 10.1088/1674-1056/ac560c
Gu Ma(马顾)1,2, Peng-Lei Zheng(郑鹏磊)1,2, Zheng-Wen Hu(胡正文)1,2, Suo-Dong Ma(马锁冬)1,2,3, Feng Xu(许峰)1,2,†, Dong-Lin Pu(浦东林)1,2, and Qin-Hua Wang(王钦华)1,2,‡
Gu Ma(马顾)1,2, Peng-Lei Zheng(郑鹏磊)1,2, Zheng-Wen Hu(胡正文)1,2, Suo-Dong Ma(马锁冬)1,2,3, Feng Xu(许峰)1,2,†, Dong-Lin Pu(浦东林)1,2, and Qin-Hua Wang(王钦华)1,2,‡
摘要: Diffractive lenses (DLs) can realize high-resolution imaging with light weight and compact size. Conventional DLs suffer large chromatic and off-axis aberrations, which significantly limits their practical applications. Although many achromatic methods have been proposed, most of them are used for designing small aperture DLs, which have low diffraction efficiencies. In the designing of diffractive achromatic lenses, increasing the aperture and improving the diffraction efficiency have become two of the most important design issues. Here, a novel phase-coded diffractive lens (PCDL) for achromatic imaging with a large aperture and high efficiency is proposed and demonstrated experimentally, and it also possesses wide field-of-view (FOV) imaging at the same time. The phase distribution of the conventional phase-type diffractive lens (DL) is coded with a cubic function to expand both the working bandwidth and the FOV of conventional DL. The proposed phase-type DL is fabricated by using the laser direct writing of grey-scale patterns for a PCDL of a diameter of 10 mm, a focal length of 100 mm, and a cubic phase coding parameter of 30π. Experimental results show that the working bandwidth and the FOV of the PCDL respectively reach 50 nm and 16° with over 8% focusing efficiency, which are in significant contrast to the counterparts of conventional DL and in good agreement with the theoretical predictions. This work provides a novel way for implementing the achromatic, wide FOV, and high-efficiency imaging with large aperture DL.
中图分类号: (Lenses, prisms and mirrors)