Editorial Material
Optics
Albert Liu
Summary: The article discusses the applications and unintuitive imaging characteristics of using off-axis parabolic mirrors to focus beams of light. These considerations have direct applications in implementing non-collinear optical geometries.
Article
Optics
Lizhong Hu, Ping Jiang, Huajun Yang, Yan Qin, Weinan Caiyang, Yifan Zheng, Jinxin Deng, Junyi He, Jing Yang
Summary: In this paper, a method of off-axis double reflection freeform miniaturized antenna design is proposed to collimate and shape elliptical beams from laser diodes (LD). The simulation results show that the method successfully reduces the divergence angle of the output light and increases the transmission efficiency of the optical communication system.
OPTICS COMMUNICATIONS
(2023)
Article
Optics
Tong Yang, Yongdong Wang, Dongwei Ni, Dewen Cheng, Yongtian Wang
Summary: This paper proposes a design method for off-axis reflective imaging systems based on freeform HOEs, which can correct aberrations in nonsymmetric imaging systems. The initial imaging system is generated using a point-by-point design approach, and a joint optimization is conducted to obtain the final design results. The feasibility and effectiveness of the method are validated through the design and fabrication of a high-performance off-axis reflective head-up display system.
Article
Optics
Haoqiang Wang, Yi Luo, Hongtao Li, Zihan Zang, Yunpeng Xu, Yanjun Han, Changzheng Sun, Zhibiao Hao, Lai Wang, Bing Xiong, Jian Wang, Lin Gan
Summary: In this paper, an extended ray-mapping method is proposed that incorporates differentiable ray-tracing into the design pipeline, allowing for accurate surface construction and efficient shape correction. The method involves two optimization stages and has successfully designed non-paraxial and off-axis illumination lenses in a short time. Simulation results demonstrate the effectiveness and robustness of the approach.
Article
Optics
Yuanhe Sun, Yuanqi Sun, Xiaoyu Chen, Fang Wang, Xin Yan, Xuenan Zhang, Tonglei Cheng
Summary: In this paper, a straightforward and dynamic approach to design unobstructed off-axis reflective image systems using a planar linkage mechanism is proposed. The advantage of this design is that it simplifies the process of modeling and optimizing the optical system. The method places the center of the surface at the hinge point and determines its tilt angle and position based on the adjacent hinge coordinates, and then the curvature of each reflector is determined by the relationship of the optical power. To verify the feasibility and convenience of the method, an off-axis four-mirror free-form system is designed with a field of view of 5 degrees x 5 degrees, and the results of the optimized system show that the MTFs are greater than 0.8 at 30 lp/mm.
Article
Optics
Deyan Zhu, Yufan Zhang, Zijia Hu, Yixuan Liu, Pan Guo, Jingqin Su
Summary: A cooled infrared off-axis freeform three-mirror system model is proposed for convenient testing and assembly, achieving high imaging quality with a freeform surface. The results demonstrate that the system can be designed with a small f-number, 100% cold stop efficiency, and high convenience in testing and assembly.
Article
Optics
Zhaoxun Mi, Zexiao Li, Xiaodong Zhang
Summary: This paper proposes a method for constructing off-axis reflective optical systems to achieve a compact feature. By simultaneously optimizing aberration and mirror coordinates using a genetic algorithm, an initial compact structure is obtained, and a compact off-axis three-mirror reflective system with an entrance pupil diameter of 90 mm is designed.
Article
Optics
Haodong Shi, Han Zhao, Jiayu Wang, Yi-Lan Zhang, Yufang Wu, Chao Wang, Qiang Fu, Huilin Jiang
Summary: A polarization aberration analysis method for freeform optical systems with fringe Zernike polynomial is proposed in this study. An analytical model for the polarization aberration is constructed and the influence of surface shape is investigated. It is found that the introduction of freeform surfaces causes the system to lose rotational symmetry in the polarization aberration distribution. A multi-angle polarization characteristic test platform is also built to validate the theoretical model. The measured results show good agreement with the theoretical simulation analysis results.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Optics
Yongdong Wang, Tong Yang, Dongwei Ni, Dewen Cheng, Yongtian Wang
Summary: In this Letter, a design and fabrication method for a full-color augmented reality (AR) optical system based on a freeform holographic optical element (HOE) is proposed. A point-by-point design method is used to generate the starting point of the system. The recording systems of the full-color HOE are designed based on the preliminarily optimized system. A joint optimization is conducted, considering the overall imaging performance, diffraction efficiency, constraints, and fabrication. A prototype is fabricated to validate the feasibility and effectiveness of the proposed method.
Article
Optics
Xinyu Liu, Jun Zhu
Summary: This paper proposes a data point calculation method that does not require Fermat's principle and a simple and general design method for the starting points of freeform off-axis multi-mirror optical systems. The method aims to promote the realization of high-performance reflective systems with freeform surfaces. A case study of designing a low F-number freeform off-axis five-mirror system is presented to demonstrate the effectiveness of the proposed method. The method can also be applied to the design of freeform reflective systems with different numbers of mirrors.
Article
Optics
Menghui Lan, Bing Li, Xiuyuan Wu, Xiang Wei
Summary: This paper proposes an intelligent splicing technology using a Zygo interferometer for off-axis aspherical mirrors, providing a solution for manufacturing large aspherical mirrors.
OPTICS AND LASERS IN ENGINEERING
(2023)
Article
Telecommunications
Rene Kirrbach, Michael Faulwasser, Mira Stephan, Tobias Schneider, Frank Deicke
Summary: This study demonstrates the practical feasibility of a freeform multipath lens for optical wireless communications, increasing the eye safety laser power limit. It successfully transmitted 1.289Gbit/s of data and achieved a low bit error rate.
IEEE COMMUNICATIONS LETTERS
(2022)
Article
Optics
Xijie Li, Chunbo Zou, Jiating Yang
Summary: This paper proposes an effective method based on coaxial parent mirrors to design an image-side telecentric anastigmatic system with an ultrawide field of view. By optimizing the off-axis aberration optical path and introducing non-aspheric surfaces, the system achieves high imaging quality, demonstrating its effectiveness.
Article
Optics
Tong Yang, Huiming Xu, Dewen Cheng, Yongtian Wang
Summary: In this paper, a design method of compact and simplified off-axis freeform imaging systems is proposed, integrating the design of a geometric freeform system and the image recovery neural network. This method works for off-axis nonsymmetric system structure and multiple freeform surfaces with complicated surface expression. Two design examples demonstrate the feasibility and effectiveness of the framework.
Article
Optics
Lingzhi Zheng, Adam J. Susa, Ronald K. Hanson
Summary: Schlieren imaging is commonly used to study fluid dynamics, but traditional systems have large footprints. This study presents a ray-tracing-based design method for a modified schlieren system using off-axis parabolic mirrors, which reduces system length and produces high-quality images.
