Chinese Optics Letters, 2017, 15 (6): 062202, Published Online: Jul. 20, 2018   

Design of image-side telecentric freeform imaging systems based on a point-by-point construction-iteration process Download: 939次

Author Affiliations
State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University, Beijing 100084, China
Abstract
In this Letter, we present a novel design method of image-side telecentric freeform imaging systems. The freeform surfaces in the system can be generated using a point-by-point design approach starting from an initial system consisting of simple planes. The proposed method considers both the desired object–image relationships and the telecentricity at the image-side during the design process. The system generated by this method can be taken as a good starting point for further optimization. To demonstrate the benefit and feasibility of our method, we design two freeform off-axis three-mirror image-side telecentric imaging systems in the visible band. The systems operate at F/1.9 with a 30 mm entrance pupil diameter and 5° diagonal field-of-view. The modulation-transfer-function curves are above 0.69 at 100 lps/mm.

Tong Yang, Guofan Jin, Jun Zhu. Design of image-side telecentric freeform imaging systems based on a point-by-point construction-iteration process[J]. Chinese Optics Letters, 2017, 15(6): 062202.

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