Analysis on Resolution Enhancement by Optical Pupil Apodization in a Laser Scanning Printing System

2016 ◽  
Author(s):  
Wan-chin Kim ◽  
Sang-Koo Han ◽  
Sung-Dae Kim
Keyword(s):  
Optical System ◽  
Laser Scanning ◽  
Focal Length ◽  
Resolution Enhancement ◽  
Focal Depth ◽  
Optical Resolution ◽  
Spot Size ◽  
Experimental Result ◽  
Entrance Pupil ◽  
High Degree

Apodization of amplitude and phase at the entrance pupil of an optical system is able to have advantages on optical resolution and focal depth. As an optical system for the electro-photography continuously requires highly resolved dot image and extended focal length to obtain more delicate expression with adequate production stability. Advantages from apodization technique can improve system performance and supply high degree of reliability of the optical system. In this study, theoretical apodization characteristics in a laser scanning optical system for electro-photography is firstly analyzed in the aspects of enhancement of optical resolution and focal depth with the proposed method of apodization. In addition, fundamental experimental result on measurement of beam spot size is reported to support theoretical results.

scholarly journals Catadioptric Optical System Design of 15-Magnitude Star Sensor with Large Entrance Pupil Diameter

Sensors ◽  
2020 ◽  
Vol 20 (19) ◽  
pp. 5501
Author(s):  
Yang Bai ◽  
Jianlin Li ◽  
Rongwei Zha ◽  
Ying Wang ◽  
Guangzhi Lei
Keyword(s):  
Optical System ◽  
Attitude Control ◽  
Pupil Diameter ◽  
Focal Length ◽  
Field Of View ◽  
Star Sensor ◽  
Spherical Lens ◽  
Entrance Pupil ◽  
Secondary Mirror ◽  
Entrance Pupil Diameter

The optical system is one of the core components for star sensors, whose imaging quality directly influences the performance of star sensors for star detection, thereby determining the attitude control accuracy of spacecrafts. Here, we report a new type of optical system with a catadioptric structure and a large entrance pupil diameter for a 15-magnitude star sensor. It consists of an improved Cassegrain system (R-C system), an aperture correction spherical lens group and a field of view correction spherical lens group. By embedding the secondary mirror of the R-C system into the output surface of the negative spherical lens of the aperture correction spherical lens group, the blocking of incident light is eliminated from the secondary mirror holder. After the structure optimization, the catadioptric optical system (COS) had a spectral range of 450 nm–950 nm, an entrance pupil diameter of 250 mm, a half-diagonal field of view of 1.4° and a focal length of 390 mm. By using theoretical calculations and experimental measurements, it was verified that the COS, with the ability to correct astigmatism, lateral color and distortion, can fulfill the detection of 15-magnitude dark stars.

The Influence of GGG70L Laser Surface Hardening Power on Quenched Layer Performance

2013 ◽  
Vol 774-776 ◽  
pp. 1051-1054
Author(s):  
Yun Tao Li ◽  
Fei Xiang Jin ◽  
Ning Xu Wang ◽  
Qing Chang ◽  
De Yu Liu
Keyword(s):  
Laser Scanning ◽  
Focal Length ◽  
Scanning Speed ◽  
Quality Standard ◽  
Spot Size ◽  
Laser Surface ◽  
Production Factors ◽  
Laser Scanning Speed ◽  
Die Material ◽  
Hardening Power

GGG70L die material laser phase change hardening aims to discover the Quenched Layer performance of the GGG70L die material hardened by the laser of different power. Making comparison and analysis in the experiment and considering the actual production factors such as cost, working efficiency and product quality standard, it is concluded that laser power being 1900 w, laser scanning speed 6mm/s, spot size 3×15 mm2, focal length being 305mm, the surface of the material quality can meet the requirements of industrial production, laser surface quenched layer becomes harder, good abrasion resistance on the surface of the material is obtained.

A High Resolution Scanning Microscope

1968 ◽  
Vol 26 ◽  
pp. 356-357
Author(s):  
A. V. Crewe ◽  
J. Wall ◽  
L. M. Welter
Keyword(s):  
High Resolution ◽  
Field Emission ◽  
Spherical Aberration ◽  
Focal Length ◽  
Spot Size ◽  
Emission Source ◽  
Field Of View ◽  
Scanning Microscope ◽  
Magnetic Lens ◽  
High Quality

A scanning microscope using a field emission source has been described elsewhere. This microscope has now been improved by replacing the single magnetic lens with a high quality lens of the type described by Ruska. This lens has a focal length of 1 mm and a spherical aberration coefficient of 0.5 mm. The final spot size, and therefore the microscope resolution, is limited by the aberration of this lens to about 6 Å.The lens has been constructed very carefully, maintaining a tolerance of + 1 μ on all critical surfaces. The gun is prealigned on the lens to form a compact unit. The only mechanical adjustments are those which control the specimen and the tip positions. The microscope can be used in two modes. With the lens off and the gun focused on the specimen, the resolution is 250 Å over an undistorted field of view of 2 mm. With the lens on,the resolution is 20 Å or better over a field of view of 40 microns. The magnification can be accurately varied by attenuating the raster current.

Spot size and effective focal length measurements for a fast axial flow CO2 laser

1997 ◽  
Author(s):  
Robert J. Steele ◽  
Phillip W. Fuerschbach ◽  
Danny O. MacCallum
Keyword(s):  
Co2 Laser ◽  
Focal Length ◽  
Axial Flow ◽  
Spot Size ◽  
Effective Focal Length ◽  
Length Measurements

Laser-scanning optical-resolution photoacoustic microscopy

2009 ◽  
Vol 34 (12) ◽  
pp. 1771 ◽  
Author(s):  
Zhixing Xie ◽  
Shuliang Jiao ◽  
Hao F. Zhang ◽  
Carmen A. Puliafito
Keyword(s):  
Laser Scanning ◽  
Optical Resolution ◽  
Photoacoustic Microscopy

Long focal length and large aperture zoom optical system

2021 ◽  
Author(s):  
Wei-jun Chang ◽  
Bo Zhang ◽  
Ge-ping Cao
Keyword(s):  
Optical System ◽  
Focal Length ◽  
Large Aperture

scholarly journals Novel droplet near-field transducer for heat-assisted magnetic recording

Nanophotonics ◽  
2015 ◽  
Vol 4 (4) ◽  
pp. 503-510 ◽  
Author(s):  
Jacek Gosciniak ◽  
Marcus Mooney ◽  
Mark Gubbins ◽  
Brian Corbett
Keyword(s):  
Surface Plasmon ◽  
Magnetic Recording ◽  
Near Field ◽  
Metal Structure ◽  
Spot Size ◽  
Impedance Match ◽  
Localized Surface Plasmon ◽  
Heat Assisted Magnetic Recording ◽  
Localized Surface Plasmon Resonances ◽  
High Degree

AbstractTwo main ingredients of plasmonics are surface plasmon polaritons (SPP) and localized surface plasmon resonances (LSPR) as they provide a high degree of concentration of electromagnetic fields in the vicinity of metal surfaces, which is well beyond that allowed by the diffraction limit of optics. Those properties have been used in the new technique of heat assisted magnetic recording (HAMR) to overcome an existing limit of conventional magnetic recording by utilizing a near-field transducer (NFT). The NFT designs are based on excitation of surface plasmons on a metal structure, which re-radiate with a subdiffraction limited light spot confined in the near field. In this paper, we propose a novel “droplet”-shaped NFT, which takes full advantage of a recenltly proposed Mach–Zehnder Interferometer (MZI), a coupling arrangement that allows optimal coupling of light to the transducer. The droplet design ensures better impedance match with the recording media and, consequently, better coupling of power. The droplet design results in very high enhancement of the electric field and allows the confinement of light in a spot size much smaller than the present stateof- the-art lollipop transducer.

scholarly journals Optical Design of a Shortwave Infrared Dual Camera CASSI Based on Improved Offner-Wynne Imaging Spectrometer

2021 ◽  
Vol 2112 (1) ◽  
pp. 012021
Author(s):  
Chong Song ◽  
Lipeng Huo ◽  
Yong Huang ◽  
Yangdong Yan ◽  
Gang Wang ◽  
...  
Keyword(s):  
Optical System ◽  
Imaging System ◽  
Optical Measurement ◽  
Focal Length ◽  
Optical Design ◽  
Optical Transmittance ◽  
Coded Aperture ◽  
Visual Axis ◽  
Imaging Spectrometer ◽  
Shortwave Infrared

Abstract Based on the optical system characteristics of coded aperture snapshot spectral imager (CASSI), an optimized optical system of shortwave infrared dual camera CASSI was designed based on improved Offner-Wynne imaging spectrometer. The operating wavelength of the optical system ranges from 900nm to 1700nm, and the focal length is 1200mm. It consists of two parts: the two dimensional imaging system and the multispectral CASSI imaging system. The key technical parameters of the two parts are the same and there is no visual axis difference. Therefore, the optimized optical system can effectively improve real-time performance, optical transmittance and compactness of the dual camera shortwave infrared CASSI, which is conducive to the application in optical measurement scenes in the shooting range.

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