scholarly journals Speckle reduction using phase plate array and lens array

2020 ◽  
Vol 3 (1) ◽  
pp. 19003601-19003606
Author(s):  
Xiaohui Ma ◽  
◽  
Anting Wang ◽  
Fenghua Ma ◽  
Shuimei Wu ◽  
...  
Keyword(s):  
Speckle Reduction ◽  
Phase Plate ◽  
Lens Array ◽  
Plate Array

scholarly journals Development of computer-controlled atmospheric pressure plasma structuring for 2D/3D pattern on fused silica

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Duo Li ◽  
Peng Ji ◽  
Yang Xu ◽  
Bo Wang ◽  
Zheng Qiao ◽  
...  
Keyword(s):  
Atmospheric Pressure ◽  
Mechanical Load ◽  
Removal Rate ◽  
Atmospheric Pressure Plasma ◽  
Fused Silica ◽  
Phase Plate ◽  
Gaussian Shape ◽  
Lens Array ◽  
Pressure Plasma ◽  
Computer Controlled

AbstractFused silica with structured and continuous patterns is increasingly demanded in advanced imaging and illumination fields because of its excellent properties and functional performance. Atmospheric pressure plasma, based on pure chemical etching under atmospheric pressure, is developed as a promising fabrication technique for fused silica due to its deterministic high material removal rate, controllable removal imprint and no mechanical load. The stable and controllable Gaussian-shape removal function makes computer-controlled plasma tool potential to generate complex structures with high accuracy, efficiency and flexibility. In the paper, computer-controlled atmospheric pressure plasma structuring (APPS) is proposed to fabricate 2D/3D patterns on fused silica optics. The capacitively coupled APPS system with a double-layer plasma torch and its discharge characteristics are firstly developed. By means of multi-physics simulation and process investigation, the stable and controllable Gaussian-shape removal function can be achieved. Two different structuring modes, including discrete and continuous APPS, are explored for 2D/3D patterns. A series of structuring experiments show that different kinds of 2D patterns (including square lens array, hexagon lens array and groove array) as well as complex 3D phase plate patterns have been successfully fabricated, which validates the effectiveness of the proposed APPS of 2D/3D patterns on fused silica optics.

Study on optical hierarchical sorting of particles based on the Fraunhofer diffraction field of spiral phase plate array

2020 ◽  
Vol 59 (11) ◽  
Author(s):  
Kaimin Wang ◽  
Bingguo Shi ◽  
Bo Dai ◽  
Leihong Zhang ◽  
Zhaoxia Han ◽  
...  
Keyword(s):  
Diffraction Field ◽  
Phase Plate ◽  
Fraunhofer Diffraction ◽  
Plate Array ◽  
Spiral Phase Plate ◽  
Spiral Phase

Speckle reduction using rotating random micro-lens array in laser display

2015 ◽  
Vol 30 (2) ◽  
pp. 359-364
Author(s):  
付瀚毅 FU Han-yi ◽  
刘伟奇 LIU Wei-qi ◽  
魏忠伦 WEI Zhong-lun ◽  
康玉思 KANG Yu-si ◽  
陶淑苹 TAO Shu-ping ◽  
...  
Keyword(s):  
Speckle Reduction ◽  
Lens Array ◽  
Laser Display ◽  
Micro Lens Array ◽  
Micro Lens

Characteristics of an Electrostatic Phase Plate

1972 ◽  
Vol 30 ◽  
pp. 618-619
Author(s):  
William Krakow ◽  
Benjamin Siegel
Keyword(s):  
Phase Contrast ◽  
Objective Lens ◽  
Phase Plate ◽  
Net Charge ◽  
Phase Plates ◽  
Beam Currents ◽  
Contrast Image ◽  
Bright Phase ◽  
Additional Phase Shift ◽  
Additional Phase

Unwin has used a metallized non-conducting thread in the back focal plane of the objective lens that stops out a portion of the unscattered beam, takes on a localized positive charge and thus produces an additional phase shift to give a different transfer function of the lens. Under the particular conditions Unwin used, the phase contrast image was shifted to bright phase contrast for optimum focus.We have investigated the characteristics of this type of electrostatic phase plate, both analytically and experimentally, as functions of the magnitude of charge and defocus. Phase plates have been constructed by using Wollaston wire to mount 0.25μ diameter platinum wires across apertures ranging from 50 to 200μ diameter and vapor depositing SiO and gold on the mounted wires to give them the desired charging characteristics. The net charge was varied by adjusting only the bias on the Wehnelt shield of the gun, and hence the beam currents and effective size of the source.

Sign in / Sign up

Export Citation Format

Share Document