Work

High precision fabrication method and spectral imaging performance of harmonic diffractive lenses based on grayscale laser direct writing technology

Year: 2025

Type: article

Abstract: Compared to step-profile Fresnel diffractive lenses, continuous-profile harmonic diffractive lenses (HDL) have a broader imaging spectrum and higher diffraction efficiency. This paper analyzes the challenges of HDL fabricating using the grayscale laser direct writing (GLDW) technology. A continuous-profile control method is proposed, in which full-process nonlinear correction is employed to optimize the nonlinear errors introduced during the entire fabrication process. As a result, a HDL whose diameter is 50 mm and the average diffraction efficiency is superior to 85 % has been successfully fabricated. Furthermore, the spectral imaging characteristics of the HDL are verified by experiments. The results show that the measured spectral resolution is 0.6 nm and the spatial resolution is 130 lp/mm, respectively, which are consistent with the theoretical values. The RMS of wavefront error is better than λ/20 (@ λ = 632.8 nm).

Source: Optics & Laser Technology

DOI: 10.1016/j.optlastec.2025.114409

Authors: Xin Liu, Min Li, Shanghong Guan, Jiang Bian, Baiping Lei, Junfeng Du

Institutions: University of Electronic Science and Technology of China, Chinese Academy of Sciences, Institute of Optics and Electronics, Chinese Academy of Sciences, University of Chinese Academy of Sciences

Language: English

Topic: Advanced optical system design

Subfield: Biomedical Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $3,230

Funder: National Natural Science Foundation of China