• Title, Summary, Keyword: Scanning Laser Beam

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Effect of Nd:YVO4 Laser Beam Direction on Direct Patterning of Indium Tin Oxide Film

  • Ryu, Hyungseok;Lee, Dong Hyun;Kwon, Sang Jik;Cho, Eou Sik
    • Journal of the Semiconductor & Display Technology
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    • v.18 no.3
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    • pp.72-76
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    • 2019
  • A Q-switched diode-pumped neodymium-doped yttrium vanadate (YVO4, λ =1064nm) laser was used for the direct patterning of indium tin oxide (ITO) films on glass substrate. During the laser direct patterning, the laser beam was incident on the two different directions of glass substrate and the laser ablated patterns were compared and analyzed. At a low scanning speed of laser beam, the larger laser etched lines were obtained by laser beam incident in reverse side of glass substrate. On the contrary, at a higher scanning speed, the larger etched pattern sizes were found in case of the beam incidence from front side of glass substrate. Furthermore, it was impossible to find no ablated patterns in some laser beam conditions for the laser beam from reverse side at a much higher scanning speed and repetition rate of laser beam. The laser beam is expected to be transferred and scattered through the glass substrate and the laser beam energy is thought to be also dispersed and much more influenced by the overlapping of each laser beam spot.

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Wide Beam Optical System for the Laser Materials Processing (레이저 재료 가공을 위한 광폭빔 광학 장치)

  • 김재도;조응산;전병철
    • Journal of Korean Society of Laser Processing
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    • v.1 no.1
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    • pp.24-29
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    • 1998
  • A new wide laser beam optical system for the laser materials processing has been developed with a polygonal mirror. It consists of polygonal mirror and cooling part that prevents the surface of rotating polygonal mirror from damage by heat. The polygonal minors have been designed and made as 24 and 30 facets in pyramid type. This system provides a uniform linear laser heat source with the surface scanning width from 15 to 50mm according to the scanning height To examine the wide laser beam, He-Ne laser is used. Also, Acryl is used to confirm the laser beam pattern by bum-pattern print To analyze the energy distribution of the wide laser ben empirical values and theoretical values are compared and discussed. To improve the efficiency of the wide laser beam optical system, methods are suggested by the optical theories. For larger area processing like turbine blade, drawing blade, cold roller and guide plate, optimal overlapping locations have been calculated and analyzed by geometric and optical theories.

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Photopolymer Solidification Phenomena Considering Laser Exposure Conditions in Micro-stereolithography Technology (마이크로 광 조형에서 레이저 주사조건에 따른 광 경화성수지의 경화현상)

  • 이인환;조동우;이응숙
    • Journal of the Korean Society for Precision Engineering
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    • v.21 no.3
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    • pp.171-179
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    • 2004
  • Micro-stereolithography technology has made it possible to fabricate a freeform 3D microslructure. This technology is based on conventional stereolithography, in which a UV laser beam irradiates the open surface of a UV-curable liquid photopolymer, causing it to solidify. In micro-stereolithography, a laser beam of a few $\mu m$ diameter is used to solidify a very small area of the photopolymer. This is one of the key technological elements, and can be achieved by using a focusing lens. Thus, the solidification phenomena of the liquid photopolymer must be carefully investigated. In this study, the photopolymer solidification phenomena in response to variations in the scanning pitch of a focused laser beam was investigated experimentally. The effect of layer thickness on the solidification width and depth was also examined. These studies were conducted under the conditions of relatively lower laser power and relatively higher scanning speed. Moreover, the photopolymer solidification phenomena for the relatively higher laser power and lower scanning speed was investigated, too. In this case, comparing to the case of lower laser power and higher scanning speed, the photopolymer absorbed large amount of irradiation energy of the laser beam. These results were compared with those obtained from a photopolymer solidification model. From these results, a new laser-scanning scheme was proposed according to the shape of the 3D model. Samples by each method were fabricated successfully.

Laser Scanning Technology for Ultrasonic Horn Location Compensation to Modify Nano-size Grain (나노계면 형성을 위한 초음파 진동자 위치보정을 위한 레이저 스캐닝 기술)

  • Kim, Kyugnhan;Lee, Jaehoon;Kim, Hyunse;Park, Jongkweon;Yoon, Kwangho
    • Journal of the Korean Society for Precision Engineering
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    • v.31 no.12
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    • pp.1121-1126
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    • 2014
  • To compensate location error of ultrasonic horn, the laser scanning system based on the galvanometer scanner is developed. It consists of the 3-Axis linear stage and the 2-Axis galvanometer scanner. To measure surface shape of three-dimensional free form surface, the dynamic focusing unit is adopted, which can maintain consistent focal plane. With combining the linear stage and the galvanometer scanner, the scanning area is enlarged. The scanning CAD system is developed by stage motion teaching and NURBS method. The laser scanning system is tested by marking experiment with the semi-cylindrical sample. Scanning accuracy is investigated by measured laser marked line width with various scanning speed.

8 Beam Laser Diode Development for Laser Scanning Unit (Laser Scanning Unit을 위한 8빔 레이저 다이오드 개발)

  • Song, Dae-Gwon;Park, Jong-Keun;Kim, Jae-Gyu;Park, Jung-Hyun;So, Sang-Yang;Kwak, Yoon-Seok;Yang, Min-Sik;Choi, An-Sik;Kim, Tae-Kyung
    • Korean Journal of Optics and Photonics
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    • v.21 no.3
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    • pp.111-117
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    • 2010
  • A 780 nm monolithic individually addressable 8-beam diode laser with 10mW optical power was developed for use in a laser scanning unit. Beam to beam spacing is $30\;{\mu}m$ and an air bridge interconnection process was developed for individual operations. From electrical and optical characteristic measurements, the developed device is a suitable optical source for a high speed laser scanning unit in multi-function printing systems and laser beam printers.

A study on the theoretical minimum resolution of the laser range finder (레이저 거리계의 이론적 최소 분해능에 관한 연구)

  • 차영엽;권대갑
    • 제어로봇시스템학회:학술대회논문집
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    • pp.644-647
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    • 1996
  • In this study the theoretical minimum resolution analysis of an active vision system using laser range finder is performed for surrounding recognition and 3D data acquisition in unknown environment. The laser range finder consists of a slitted laser beam generator, a scanning mechanism, CCD camera, and a signal processing unit. A laser beam from laser source is slitted by a set of cylindrical lenses and the slitted laser beam is emitted up and down and rotates by the scanning mechanism. The image of laser beam reflected on the surface of an object is engraved on the CCD array. In the result, the resolution of range data in laser range finder is depend on distance between lens center of CCD camera and light emitter, view and beam angles, and parameters of CCD camera.

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Performance Experiment of Electron Beam Convergence Instrument (Finishing 용 전자빔 집속 장치의 성능 실험)

  • Lim, Sun Jong
    • Journal of Korean Society of Laser Processing
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    • v.18 no.3
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    • pp.6-8
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    • 2015
  • Finishing process includes deburring, polishing and edge radiusing. It improves the surface profile of specimen and eliminates the alien substance on surface. Deburring is the elimination process for debris of edges. Polishing lubricates surfaces by rubbing or chemical treatment. There are two types for electron finishing. The one is using pulse beam. The other is using the convergent and scanning electron beam. Pulse type device appropriates the large area process. But it does not control the beam dosage. Scanning type device has advantages for dosage control and edge deburring. We design the convergence and scan type. It has magnetic lenses for convergence and scan device for scanning beam. Magnetic lenses consist of convergent and objective lens. The lenses are designed by the specification(beam size and working distance). In this paper, we evaluate the convergence performance by pattern process. Also, we analysis the results and important factors for process. The important factors for process are beam size, pressure, stage speed and vacuum. These results will be utilized into systematizing pattern shape and the factors.

An Analysis of the Relationship between Surface Profile Error of f-$\theta$Lens and Optical Performance (f-$\theta$렌즈 표면형상오차와 광학적 성능과의 연관성 분석)

  • Kim, Dong-Sik;Lee, In-Yong;Kim, Hyeong-Chae
    • Journal of the Korean Society for Precision Engineering
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    • v.18 no.2
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    • pp.90-95
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    • 2001
  • f-$\theta$len is one of the important parts in Laser Scanning Unit because it affects on the optical performance of Laser Scanning Unit dominantly. It is necessary to find out the relationship between the surface profile error of f-$\theta$lens and the beam profile focusing on the Organic Photo Conductive drum in order to analysis the beam profile problems such as appearance of side lobe and expansion of center lobe. In this research, a simulation process which relates the surface profile characteristics to the beam profile has been developed by CODE V. The simulated beam profile also have been compared with the measurement results.

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Remote sensing and photogrammetry techniques in diagnostics of concrete structures

  • Janowski, Artur;Nagrodzka-Godycka, Krystyna;Szulwic, Jakub;Ziolkowski, Patryk
    • Computers and Concrete
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    • v.18 no.3
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    • pp.405-420
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    • 2016
  • Recently laser scanning technologies become widely used in many areas of the modern economy. In the following paper authors show a potential spectrum of use Terrestrial Laser Scanning (TLS) in diagnostics of reinforced concrete elements. Based on modes of failure analysis of reinforcement concrete beam authors describe downsides and advantages of adaptation of terrestrial laser scanning to this purpose, moreover reveal under which condition this technology might be used. Research studies were conducted by Faculty of Civil and Environmental Engineering at Gdansk University of Technology. An experiment involved bending of reinforced concrete beam, the process was registered by the terrestrial laser scanner. Reinforced concrete beam was deliberately overloaded and eventually failed by shear. Whole failure process was tracing and recording by scanner Leica ScanStation C10 and verified by synchronous photographic registration supported by digital photogrammetry methods. Obtained data were post-processed in Leica Cyclone (dedicated software) and MeshLab (program on GPL license). The main goal of this paper is to prove the effectiveness of TLS in diagnostics of reinforced concrete elements. Authors propose few methods and procedures to virtually reconstruct failure process, measure geometry and assess a condition of structure.

Laser scanning unit with plastic f$\theta$ lenses featuring high resolution (600DPI용 플라스틱 f$\theta$렌즈가 실장된 Laser Scanning Unit 의 측정 및 평가)

  • 임천석
    • Korean Journal of Optics and Photonics
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    • v.10 no.5
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    • pp.364-368
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    • 1999
  • We investigate the evaluation items of LSU (Laser Scanning Unit), such as beam size, f$\theta$ characteristics, linearity, skew and bow, optical power ratio between image height of 0mm and $\pm$108 mm, pitch error, Jitter and shift of printing position. Through the measurement of LSU using BSH (Beam Scan Head) installed on LMC (Linear Motion Controller) which moves linearly within the whole scanning range (-108 mm~+108 mm), we can ascertain plastic f$\theta$ lenses, which are manufactured by TVLP (Two-step Variable Low Pressure) molding method, to satisfy 600DPI(Dots Per Inch) performance.

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