Non-scanning 2-D laser cutting with computer-generated hologram and superposition of orthogonal polarizations for improving discontinuous image pattern = 컴퓨터 생성 홀로그램을 이용한 비스캔 2차원 레이저 절단 및 불연속적인 이미지 패턴 개선을 위한 서로 수직한 편광 중첩 기술

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Lasers are used in precise material processing because they can be focused into small region to achieve high energy densities. The conventional laser processing method has a limitation on the processing speed because it is performed by scanning a single spot. In order to overcome this problem, it is necessary to use a hologram to spatially distribute a high power or high energy laser beam on the target and simultaneously process it. In this dissertation, we propose a non-scanning 2-D laser cutting method using a phase-only computer-generated Fourier hologram. In general, a line image reconstructed by a phase-only Fourier hologram has a spatially fluctuating phase, so that a discontinuous pattern occurs due to interference between spots. This is the main reason for the difficulty of laser cutting using a hologram. In order to minimize this and to obtain continuous line images, the line target is divided into two targets and then reconstructed with orthogonally polarized beams, and they were crossed and superposed. Using computer-generated holograms which are designed and fabricated using this method, 2-D laser cutting was performed on polyimide film with a high energy laser without scanning process. The diffusion of the heat absorbed in the material was then calculated by the finite element method and compared with the experimental results.
Advisors
Kong, Hong Jinresearcher공홍진researcher
Description
한국과학기술원 :물리학과,
Publisher
한국과학기술원
Issue Date
2018
Identifier
325007
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 물리학과, 2018.2,[vi, 94 p. :]

Keywords

Hologram▼aFourier hologram▼aComputer-generated hologram▼aLaser cutting▼aHolographic laser processing; 홀로그램▼a푸리에 홀로그램▼a컴퓨터 생성 홀로그램▼a레이저 절단 가공▼a홀로그램 레이저 가공

URI
http://hdl.handle.net/10203/264633
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=734291&flag=dissertation
Appears in Collection
PH-Theses_Ph.D.(박사논문)
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