Focus control system for laser welding

Francis M. Haran, Duncan P. Hand, Chris Peters, J. D C Jones

Research output: Contribution to journalArticlepeer-review

39 Citations (Scopus)


We describe a focus control system for Nd:YAG laser welding based on an optical sensor incorporated into the fiber delivery system to detect light generated by the process. This broadband light is separated into two wavelength bands, and simple electronic processing gives a signal proportional to focal error as a result of chromatic aberrations in the optical delivery system. Focus control is demonstrated for bead-on-plate welds in different thicknesses of titanium alloy, aluminum alloy, mild steel, and stainless steel. The control system works for both pulsed and continuous laser radiation. © 1997 Optical Society of America.

Original languageEnglish
Pages (from-to)5246-5251
Number of pages6
JournalApplied Optics
Issue number21
Publication statusPublished - 20 Jul 1997


  • Laser welding
  • Process monitoring and control


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