Papers by Author: Jae Hoon Lee

Abstract: This paper presents an on-the-fly method to synchronize a laser scanner and a linear stage for fast and wide area fabrication. Demands for high-precision laser processing with wide area have been increasing for a number of applications such as in solar cell batteries, display parts, electronic components, and the automobile industry. An ultra high-speed laser scanner system is limited by its size of scanning area, for example, its scanning area is only 50 × 50 mm2. Recently, a laser scanner system that could scan a wide area was developed; however, it was found that the scanning quality of this scanner decreased with an increase in the scanning area. The developed method is different from the existing step and scanning method in that it our method ensures continuous stage movement, which may improve the processing speed and in turn the laser fabrication quality.

Abstract: Pulsed UV laser beams, which are widely used in the processing of polymers, offer many advantages in the field of polymer production, primarily because their photon energy is higher than the binding energy of the polymer. In particular, the fabrication of polymers with an excimer laser process is faster and more convenient than with other processes. Nevertheless, some problems occur in the precision microprocessing of polymers, including the formation and deposition of surface debris, which is produced from the breakdown of either polymer chains or radical bonds. In the present work, a process for eliminating carbonized surface debris contamination generated by the laser ablation of a polymer was developed. The proposed approach for removing surface debris utilizes an erasable ink pasted on the polymer. The surface debris ejected from the polymer is then combined with the ink layer on the polymer. Finally, both the surface debris and the ink layer can be removed using adhesive tape.