Article
Optics
Mansi Baliyan, Naveen K. Nishchal
Summary: This paper introduces an efficient method for generating scalar and vector modes of Bessel-Gaussian (BG) beams using a spatial light modulator (SLM) encoded with a computer-generated phase-only mask. The combination of a phase-only hologram corresponding to the transmission function of an axicon with a spatial phase plate (SPP) is used to convert a Gaussian field into a phase singular beam with an azimuthally varying spiral wavefront structure, achieving non-diffracting BG beams. A compact experimental setup is proposed for generating BG fields with homogeneous and spatially varying polarization distributions across the transverse plane. Scalar BG beams are generated by modulating the combined phase patterns of the axicon and SPP using the SLM. Vector BG beams are generated through dual-passes from the SLM in two special cases: azimuthally and radially polarized inhomogeneous distributions. A non-interferometric technique using a single SLM divided into two halves is utilized to encode scalar BG beams with orthogonal phase structures into orthogonal components of incoming light for vector BG beam generation.
Article
Optics
Zhulin Yao, Xiaowei Li, Zhipeng Wang, Zhentao Xu, Andong Wang, Lingling Huang, Jiangang Lu, Honglei Wang
Summary: The method demonstrated the fabrication of computer-generated holograms using a femtosecond Bessel beam on transparent glass, allowing for flexible adjustment of the phase profile to generate desired patterns by changing relative positions. Twin images were eliminated through high-level modulation.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Honghuan Tu, Tingge Yuan, Zhiwei Wei, Yuping Chen, Xianfeng Chen
Summary: The three-dimensional holography technique is widely used in beam shaping, holographic display, and image encryption due to its ability to store depth information and provide more realistic scene reconstruction compared to two-dimensional holography. However, the traditional nanofabrication techniques used for hologram fabrication are complex and time-consuming. In this study, we demonstrate a simpler and more flexible approach to fabricating holograms with depth information inside glass using femtosecond laser direct writing, eliminating the need for complex mask preparation. We then demonstrate and evaluate the reconstruction of three-dimensional objects, discussing experimental optimizations and limitations.
Article
Optics
Ruoqiu Wang, Zhiyu Zhang, Yingying Bai, Yanchao Wang, Xiaolin Yin, Lingsheng Kong, Weijie Deng, Donglin Xue, Xuejun Zhang
Summary: In this study, a high precision computer generated hologram (CGH) has been successfully fabricated using a scanning ion beam etching (SIBE) method, which shows superior linewidth, sidewall angle, roughness, and etching uniformity compared to conventional methods. Experimental results confirm the high accuracy etching depth achievable with this method, with a wavefront accuracy of 6.2 nm.
OPTICS AND LASERS IN ENGINEERING
(2021)
Article
Optics
Zhongsheng Zhai, Qinyang Li, Xuan He, Qinghua Lv, Wei Feng, Zhen Zeng, Xuanze Wang
Summary: This paper proposes an optimized iterative algorithm for high-quality holographic imaging across multiple planes using the angular spectrum method (ASM). By utilizing constraint factors and variable factors, the proposed method effectively improves the overall quality of different planes.
Article
Optics
Lijiao Guo, Zhiqing Feng, Yating Fu, Changjun Min
Summary: In this paper, a new approach for generating a vector beams array and dynamically manipulating the polarization state of the beam array is proposed based on a stable interferometric arrangement with a single reflective SLM. The experimental results demonstrate excellent agreement with the theoretical predictions, showing the system's capability in generating and controlling vector beams arrays with different polarization states. The system has great potential in various applications such as laser processing, optical trapping, and optical communications.
OPTICS COMMUNICATIONS
(2021)
Article
Optics
Ruijian Li, Yuan Ren, Tong Liu, Chen Wang, Zhengliang Liu, Jie Zhao, Rusheng Sun, Ziyang Wang
Summary: This paper solves the limitations of the spatial light modulator (SLM) screen resolution and the encoding algorithm in generating large topological charge vortex beams through hardware and algorithm improvements. Experimental results demonstrate the successful generation of Laguerre-Gaussian (LG) beams with topological charges up to 1200 and 1400, setting a new benchmark for precise measurement, sensing, and communication applications.
CHINESE OPTICS LETTERS
(2022)
Article
Optics
Nikita Stsepuro, Michael Kovalev, Evgenii Zlokazov, Sergey Kudryashov
Summary: The cumulative achievements in the fields of science and technology have led to significant progress in solving the phase problem in optics. Among the various phasometric methods, single-beam methods, which are more versatile and flexible, show the most promising potential. However, existing methods face the challenge of working with polychromatic radiation, requiring the use of spectral filters. This paper introduces a new approach to the synthesis of Fourier holograms, allowing holographic wavefront sensors to work with white light without the need for additional filters. Numerical and experimental verification were conducted to validate the approach.
Article
Chemistry, Multidisciplinary
Dapu Pi, Juan Liu
Summary: The proposed reference light wave multiplexing scheme increases the information capacity of computer-generated holograms by generating holograms with different reference light waves and superimposing them together. The use of a modified Gerchberg-Saxton algorithm enhances image quality, allowing for reconstruction of different images with corresponding reference light waves. Numerical simulations and optical experiments demonstrate the feasibility of the scheme, showing successful reconstruction of multiple images with a single multiplexed hologram.
APPLIED SCIENCES-BASEL
(2021)
Review
Chemistry, Multidisciplinary
Evgenii Y. Zlokazov, Vasilii V. Kolyuchkin, Dmitrii S. Lushnikov, Andrei V. Smirnov
Summary: The article discusses the use of computer-generated holograms (CGH) in security printing, particularly focusing on creating informative memory marks for automatic information retrieval in identification, copyrighting, and authentication control. It provides an overview of the theoretical basics and applications of CGH and delves into specific technical solutions like printed holograms, smart verification, and holomemory. The article presents interaction schemes between security printing manufacturers, citizens as potential consumers, and regulatory government agencies.
APPLIED SCIENCES-BASEL
(2022)
Article
Optics
YingYing Bai, ZhiYu Zhang, TianBao Chen, RuoQiu Wang, HongDa Wei, XueFeng Zeng, XueJun Zhang
Summary: The emergence of large-aperture telescopes has led to an increased demand for testing and alignment of large optical systems. Computer-generated holograms (CGHs) have proven to be an effective method for aspheric optical testing and alignment. However, the current lithography capability limits the maximum size of CGHs to 6 to 9 inches. Stitching technology shows promise for creating larger-sized CGHs.
OPTICS AND LASERS IN ENGINEERING
(2022)
Article
Optics
Alejandro Velez-Zea, John Fredy Barrera-Ramirez
Summary: In this work, we propose a method for generating double phase multiplane holograms using a modified global Gerchberg Saxton algorithm. We demonstrate that this approach offers superior accuracy compared to the conventional algorithm in some scenarios and enables the trade-off between reconstruction quality and crosstalk. Numerical and experimental results support the effectiveness of our proposal.
OPTICS AND LASERS IN ENGINEERING
(2023)
Article
Optics
Ren Noguchi, Kohei Suzuki, Yoshiki Moriguchi, Minoru Oikawa, Yuichiro Mori, Takashi Kakue, Tomoyoshi Shimobaba, Tomoyoshi Ito, Naoki Takada
Summary: The study presents an efficient calculation method that maintains a high computational speed while achieving real-time gradation-expressible electroholography. By utilizing a multi-GPU cluster system and the BW-CGH method, the reconstruction of three-dimensional objects with gradation expression was successfully achieved, showcasing a real-time electroholographic 3D video containing approximately 180,000 points.
CHINESE OPTICS LETTERS
(2021)
Article
Optics
Jung-Ping Liu, Chen-Ming Tsai
Summary: This paper explores an algorithm for generating high-quality BCGH and proposes the simulated-annealing binary search (SABS) algorithm. Compared to traditional simulated annealing, the SABS algorithm can produce BCGHs with better quality.
Article
Optics
Hengzhe Yan, Yuncong Sun, Yiqiao Lin, Feixiang Chu, Wenjie Wan
Summary: Spatial light modulators have enabled complex light field manipulation in various fields, but traditional modulators have limitations in multi-color operations. In this study, we demonstrate a multi-color spatial complex light field modulation using a single binary hologram on digital micromirror devices. By combining neighboring micro-mirror pixels into a superpixel, we achieve independent control of the light field's amplitude and phase, with a phase modulation range exceeding 2π for a single wavelength. This approach enables multi-color light modulations in 2D and 3D holographic planes, as well as the realization of a dual-colored Airy beam.
