Reviews
Lasers and Laser Optics
Recent progress in multi-wavelength fiber lasers: principles, status, and challenges 
Hualong Chen, Xiantao Jiang, Shixiang Xu, and Han Zhang
Vol. 18, Issue 4, 041405 (2020)
Research Articles
Biomedical Optics
Bone mineral density value evaluation based on photoacoustic spectral analysis combined with deep learning method
Xue Zhou, Zhibin Jin, Ting Feng, Qian Cheng, Xueding Wang, Yao Ding, Hongchen Zhan, and Jie Yuan
Vol. 18, Issue 4, 041701 (2020)
Fiber Optics and Optical Communications
Applications of weakly-coupled few-mode fibers [Invited] 
Huiyuan Liu, He Wen, and Guifang Li
Vol. 18, Issue 4, 040601 (2020)
Integrated Optics
Ultra-short plasmonic polarization beam splitter-rotator using a bent directional coupler
Bing Bai, Li Pei, Jingjing Zheng, Tigang Ning, and Jing Li
Vol. 18, Issue 4, 041301 (2020)
Lasers and Laser Optics
High repetition rate passively Q-switched laser on Nd:SRA at 1049 nm with MXene Ti3C2Tx
Mengfei Zhao, Zhongmian Zhang, Xiaoyue Feng, Mengyu Zong, Jie Liu, Xiaodong Xu, and Han Zhang
Vol. 18, Issue 4, 041401 (2020)
Coherent beam combination far-field measuring method based on amplitude modulation and deep learning
Renqi Liu, Chun Peng, Xiaoyan Liang, and Ruxin Li
Vol. 18, Issue 4, 041402 (2020)
Two-dimensional tellurene nanosheets as saturable absorber of passively Q-switched Nd:YAG solid-state laser
Tianhong Tang, Fang Zhang, Mengxia Wang, Zhengping Wang, and Xinguang Xu
Vol. 18, Issue 4, 041403 (2020)
Generation of super-high-order petal-like laser beam using Theon-sieve resonator
Xianghe Guan, Junyong Zhang, Yanli Zhang, and Jianqiang Zhu
Vol. 18, Issue 4, 041404 (2020)
Optoelectronics
An X- and Ku-band multifunctional radar receiver based on photonic parametric sampling
Lei Yu, Weiwen Zou, Xinwan Li, and Jianping Chen
Vol. 18, Issue 4, 042501 (2020)
Physical Optics
Hermite–Gaussian beams with sinusoidal vortex phase modulation
Guanxue Wang, Yue Li, Xinzhi Shan, Yu Miao, and Xiumin Gao
Vol. 18, Issue 4, 042601 (2020)
Influence of the source’s energy fluctuation on computational ghost imaging and effective correction approaches
Xiaodong Mei, Chenglong Wang, Yami Fang, Ting Song, Wenlin Gong, and Shensheng Han
Vol. 18, Issue 4, 042602 (2020)
Optimization of optical wireless power transfer using near-infrared laser diodes
Sung-Man Kim and Hanbit Park
Vol. 18, Issue 4, 042603 (2020)
Imaging through dynamic scattering media with stitched speckle patterns 
Xin Wang, Honglin Liu, Meijun Chen, Zhentao Liu, and Shensheng Han
Vol. 18, Issue 4, 042604 (2020)
Plasmonics and Metamaterials
Metalens for coaxial double wavelength focusing
Jiannong Chen, Baodong Wang, Linwei Zhu, Jing Han, and Qinfeng Xu
Vol. 18, Issue 4, 042401 (2020)
Spectroscopy
Rapid quantitative detection of mineral oil contamination in vegetable oil by near-infrared spectroscopy
Mantong Zhao, Dawei Zhang, Lulu Zheng, Otto Condliffe, and Yi Kang
Vol. 18, Issue 4, 043001 (2020)
Thin Films and Optics At Surfaces
Introduction of Ag nanoparticles by picosecond LIFT to improve the photoelectric property of AZO films
Xiaofang Xu, Jingbo Li, Xiaohan Yang, Sen Pan, and Yong Bi
Vol. 18, Issue 4, 043101 (2020)
