Study on the Precise Alignment of Micro-Lenses in the Microcolumn by Using the Laser Diffraction Pattern
The alignment precision of the electron lenses is one of the most critical factors that determine overall performance of the microcolumn system including the image resolution and aberration. Since the lens apertures are usually as small as 5 ~ 300 μm, the alignment is difficult to carry out, even if the expensive and complicated aligner is used. In this work, we have developed a novel alignment method using laser diffraction pattern, with which we can easily obtain high-precision alignment. The images of Cu grid (mesh# 1000) and carbon nanotubes (200-nm diameter) taken by the microcolumn fabricated by the new alignment scheme has confirmed that the new method was very simple and useful.
Hyungsun Kim, Junichi Hojo and Soo Wohn Lee
S. J. Ahn et al., "Study on the Precise Alignment of Micro-Lenses in the Microcolumn by Using the Laser Diffraction Pattern", Materials Science Forum, Vols. 544-545, pp. 845-848, 2007