Laser cleaning of printed circuit boards

W. D. Song, M. H. Hong, Y. F. Lu, T. C. Chong

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Laser cleaning of printed circuit boards (PCB) has been studied in this paper. It is demonstrated that laser cleaning is a powerful tool to remove resin contaminants from printed circuit boards. A Nd:YAG laser is used as a light source for laser cleaning. The beam profile of the YAG laser is reshaped and homogenized into a square beam with uniform energy distribution in the focal plane of the focusing lens by using an optical system. The printed circuit board surfaces before and after laser cleaning were inspected by an optical microscope, analysed by X-ray photoelectron spectroscopy and monitored by an acoustic wave detection method. The cleaning threshold is about 75 mJ/cm 2 and no damage is observed below 400 mJ/cm 2 .

Original languageEnglish (US)
Pages (from-to)463-467
Number of pages5
JournalApplied Surface Science
Volume208-209
Issue number1
DOIs
StatePublished - Mar 15 2003
Externally publishedYes

Keywords

  • Acoustic wave
  • Laser cleaning
  • Printed circuit board
  • Resin contaminants

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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