게시판 최근논문

[Editors Pick] Current Optics and Photonics Vol. 3 no. 5 (2019 October)

한국광학회 hit 606 date 2021-04-05

Two-dimensional Laser Drilling Using the Superposition of Orthogonally Polarized Images from Two Computer-generated Holograms

Hwihyeong Lee1 *, Seongwoo Cha2, Hee Kyung Ahn1, and Hong Jin Kong2

1 Space Optics Team, Advanced Instrumentation Institute, Korea Research Institute of Standards and Science, Daejeon 34113, Korea
2 Department of Physics, Korea Advanced Institute of Science and Technology, Daejeon 34141, Korea

 

 

 

Current Optics and Photonics  Vol. 3 No. 5 (2019 October) pp. 451-457
DOI: https://doi.org/10.3807/COPP.2019.3.5.451

 


 


Fig. 1  (a) A line target. (b) A CGH phase made with the target. (c) A reconstructed image. The insets show each of the magnified parts.

 

 

Abstract

Laser processing using holograms can greatly improve processing speed, by spatially distributing the laser energy on the target material. However, it is difficult to reconstruct an image with arrays of closely spaced spots for laser processing, because the specklelike interference pattern prevents the spots from getting close to each other. To resolve this problem, a line target was divided in two, reconstructed with orthogonally polarized beams, and then superposed. Their optical reconstruction was performed by computer-generated holograms and a pulsed laser. With this method, we performed two-dimensional (2D) laser drilling of polyimide film, with a kerf width of 20 µm and a total processing length of 20 mm.