Contents
2019
Volume: 17 Issue 5
20 Article(s)

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Research Articles
Diffraction and gratings
Diffraction of relativistic vortex harmonics with fractional average orbital angular momentum
Shasha Li, Baifei Shen, Wenpeng Wang, Zhigang Bu, Hao Zhang, Hui Zhang, and Shuhua Zhai
Chinese Optics Letters
  • Publication Date: May. 13, 2019
  • Vol.17 Issue, 5 050501 (2019)
Fiber optics and optical communications
Study on polarization spectrum and annealing properties of 45°-tilted fiber gratings
Xi Guo, Zhikun Xing, Huabao Qin, Qizhen Sun, Deming Liu, Lin Zhang, and Zhijun Yan
We have investigated the whole polarization-extinction-ratio (PER) spectrum and annealing properties of 45°-tilted fiber gratings (45°-TFGs). Experimental results show the PER spectrum of 45°-TFGs is a Gaussian-like profile and covers a 540 nm bandwidth from 1260 to 1800 nm, in which the bandwidth with PER greater than 10 dB is over 250 nm. The output polarization distribution of 45°-TFGs was analyzed by employing a bulk linear polarizer, and the results show a perfect figure “8”, which indicates that the 45°-TFG is a type of linear polarizer. Moreover, the annealing property of 45°-TFGs was measured up to 700°C, in which the PER of the grating started to decrease at 300°C and reached the minimum at 700°C. Based on these results, the 45°-TFGs can be used as an ultra-wide bandwidth in-fiber polarizing device.
Chinese Optics Letters
  • Publication Date: May. 06, 2019
  • Vol.17 Issue, 5 050601 (2019)
Holography
Image processing
Boundary segmentation based on modified random walks for vascular Doppler optical coherence tomography images
Yong Huang, Chuanchao Wu, Shaoyan Xia, Lu Liu, Shanlin Chen, Dedi Tong, Danni Ai, Jian Yang, and Yongtian Wang
Chinese Optics Letters
  • Publication Date: May. 20, 2019
  • Vol.17 Issue, 5 051001 (2019)
Three-dimensional image authentication using binarized images in double random phase integral imaging
Weitao Song, Qijia Cheng, Yue Liu, Yuanjin Zheng, Zhiping Lin, and Yongtian Wang
Chinese Optics Letters
  • Publication Date: May. 23, 2019
  • Vol.17 Issue, 5 051002 (2019)
Instrumentation, measurement, and metrology
Lasers and laser optics
Mode-locked fiber laser in the C-band region for dual-wavelength ultrashort pulses emission using a carbon nanotube saturable absorber | Editors' Pick
Kuen Yao Lau, Pin Jern Ker, Ahmad Fauzi Abas, Mohammed Thamer Alresheedi, and Mohd Adzir Mahdi
Chinese Optics Letters
  • Publication Date: May. 13, 2019
  • Vol.17 Issue, 5 051401 (2019)
LG11-mode vortex Nd:YAG laser by applying second-order circular Dammann grating for annular pumping | Editors' Pick
Quan Zhang, Junjie Yu, Biran Shi, Fanchun Tang, and Jianlang Li
Chinese Optics Letters
  • Publication Date: May. 20, 2019
  • Vol.17 Issue, 5 051402 (2019)
1.57 times diffraction-limit high-energy laser based on a Nd:YAG slab amplifier and an adaptive optics system | On the Cover
Licheng Sun, Tinghao Liu, Xing Fu, Yading Guo, Xiaojun Wang, Chongfeng Shao, Yamin Zheng, Chuang Sun, Shibing Lin, and Lei Huang
Chinese Optics Letters
  • Publication Date: May. 13, 2019
  • Vol.17 Issue, 5 051403 (2019)
Space debris laser ranging with a 60  W single-frequency slab nanosecond green laser at 200  Hz
Haifeng Zhang, Mingliang Long, Huarong Deng, Zhibo Wu, Zhien Cheng, and Zhongping Zhang
Chinese Optics Letters
  • Publication Date: May. 20, 2019
  • Vol.17 Issue, 5 051404 (2019)
Materials
Transient optical properties in fused silica measured by time-resolved high-power laser photometer
Zhen Cao, Hongbo He, Guohang Hu, Yuanan Zhao, Liujiang Yang, and Jianda Shao
A time-resolved high-power laser photometer, which measures the real-time variations of transmission, internal reflection, and scattering simultaneously with picosecond time resolution, was developed to investigate the material response sequence during high-power nanosecond laser irradiation in thick fused silica. It was found that the transient transmission decreased sharply, accompanied by an increase in internal reflection at the rising edge of the laser pulse. The transient transmission recovered, while laser damage did not occur, but it did not recover if the scattering increased, indicating the occurrence of laser damage. The reason for the sharp decrease of transmission and the relationship between the transmission drop and laser damage were discussed.
Chinese Optics Letters
  • Publication Date: May. 13, 2019
  • Vol.17 Issue, 5 051601 (2019)
Photoluminescence properties of Ca4La6(SiO4)4(PO4)2O2-based phosphors for wLEDs
Ju Cheng, Jia Zhang, Jian Lu, Xintian Bian, Hongchao Zhang, Zhonghua Shen, Xiaowu Ni, Pengcheng Ma, and Jin Shi
The apatite compound Ca4La6(SiO4)4(PO4)2O2 (CLSPO) was explored as the host material for phosphors used in white light-emitting diodes (wLEDs). The crystal structure of the CLSPO host prepared by the solid-state reaction method was investigated with Rietveld refinement. The rare earth ions (Eu3+/ Tb3+/Ce3+, Tb3+/Tb3+, Mn2+) activated CLSPO phosphors were synthesized, and their photoluminescence properties, quantum yields, as well as thermal stabilities, were studied. Under near-ultraviolet excitations, the Eu3+ and Tb3+-doped CLSPO compounds exhibited red and green emissions with high luminescence efficiencies. Besides, tunable emissions from green to orange were obtained by introducing Mn2+ ions into the Tb3+-doped CLSPO samples. The results showed that the phosphors studied may have potential applications for wLEDs.
Chinese Optics Letters
  • Publication Date: May. 23, 2019
  • Vol.17 Issue, 5 051602 (2019)
Optical design and fabrication
Optical–digital joint design of refractive telescope using chromatic priors
Jingang Zhang, Yunfeng Nie, Qiang Fu, and Yifan Peng
The conventional optical system design employs combinations of different lenses to combat aberrations, which usually leads to considerable volume and weight. In this Letter, a tailored design scheme that exploits state-of-the-art digital aberration correction algorithms in addition to traditional optics design is investigated. In particular, the proposed method is applied to the design of refractive telescopes by shifting the burden of correcting chromatic aberrations to software. By enforcing cross-channel information transfer in a post-processing step, the uncorrected chromatic aberrations are well-mitigated. Accordingly, a telescope of F-8, 1400 mm focal length, and 0.14° field of view is designed with only two lens elements. The image quality of the designed telescope is evaluated by comparing it to the equivalent designs with multiple lenses in a traditional optical design manner, which validates the effectiveness of our design scheme.
Chinese Optics Letters
  • Publication Date: May. 13, 2019
  • Vol.17 Issue, 5 052201 (2019)
Optical devices
Analysis and testing of total ionizing dose effect on several commercial optical transceivers via gamma-ray radiation
Yueying Zhan, Jianhua He, Fei Wang, and Liqian Wang
In our Letter, we selected several commercial optical transceivers, which consist of single-channel transceiver modules, parallel transmitting and receiving modules, and Ethernet passive optical network (EPON) optical line terminal (OLT) and optical network unit (ONU) modules, to do the total ionizing dose (TID) testing via the gamma-ray radiation method. The changing of current and receiver sensitivity of optical transceivers is discussed and analyzed. Based on the TID testing exposed to a TID of 50 krad (Si) at a dose rate of about 0.1 rad (Si)/s, the performance of single-channel transceivers and parallel receiving modules has not changed after 50 krad (Si) exposure, the parallel transmitting and EPON ONU modules have not worked after 40 krad (Si) and 47 krad (Si) exposure, the EPON OLT module has bit error in the process of irradiation, and it can work well after annealing; the reason for the error of OLT is analyzed. Finally, based on the theoretical analysis and testing results, this Letter provides several design suggestions to improve the reliability for optical transceivers, which can be referenced by satellite system designation for various space missions.
Chinese Optics Letters
  • Publication Date: May. 06, 2019
  • Vol.17 Issue, 5 052302 (2019)
Multichannel high extinction ratio polarized beam splitters based on metasurfaces
Haoyu Wang, Jun Zheng, Yifei Fu, Chengliang Wang, Xinran Huang, Zhicheng Ye, and Liejia Qian
Separating lights into different paths according to the polarization states while keeping their respective path’s polarizations with high purification is keen for polarization multiplex in optical communications. Metallic nanowire gratings with multi-slits in a period are proposed to achieve polarized beam splitters (PBSs) in reflection and diffraction. The setting of multi-slits largely reduces the reflection of photons with a transverse magnetific field via the plasmonic waveguiding effect, which leads to highly polarized output lights with extinction ratio larger than 20 dB in each channel. The proposed reflection/diffraction PBSs enrich the approaches to control the polarization states with the advantages of wide incident angles and flexible beam splitting angles.
Chinese Optics Letters
  • Publication Date: May. 13, 2019
  • Vol.17 Issue, 5 052303 (2019)
Quantum optics
Experimental observations of boundary conditions of continuous-time quantum walks
Xiaochuan Han, Lantian Feng, Yuxuan Li, Lanxuan Zhang, Junfeng Song, and Yongsheng Zhang
Chinese Optics Letters
  • Publication Date: May. 14, 2019
  • Vol.17 Issue, 5 052701 (2019)
Ultrafast optics