Laser autofocusing: A sliding mode approach

Edin Golubovic*, Islam S.M. Khalil, A. Kamadan, Asif Sabanovic

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

2 Citations (Scopus)


Quality of the laser processing depends on many factors, such as overall configuration of the laser workstation, control methods used and quality of the laser beam. Although lasers used in material processing are typically high energy lasers, light beam still needs to be focused in order to achieve higher energy density and smaller final spot size. This paper presents an application of sliding mode to the laser autofocusing system. Autofocusing system consists of photodiode as the measurement element, focusing lens and pilot laser beam. Photodiode is saturated and measurement is done in the nonlinear region of the responsivity curve. Problem of limited knowledge about the photodiodes behavior in this region is solved through sliding mode minimization algorithm. Verification of the proposed method is done experimentally.

Original languageEnglish
Title of host publicationProceedings - IECON 2010, 36th Annual Conference of the IEEE Industrial Electronics Society
Place of PublicationPiscataway, NJ
Number of pages6
ISBN (Print)978-1-4244-5225-5, 978-1-4244-5226-2 (CD)
Publication statusPublished - 2010
Externally publishedYes
Event36th Annual Conference of the IEEE Industrial Electronics Society, IECON 2010 - Glendale, AZ, United States
Duration: 7 Nov 201010 Nov 2010
Conference number: 36

Publication series

NameIECON Proceedings (Industrial Electronics Conference)
ISSN (Print)1553-572X
ISSN (Electronic)1553-572X


Conference36th Annual Conference of the IEEE Industrial Electronics Society, IECON 2010
Abbreviated titleIECON 2010
Country/TerritoryUnited States
CityGlendale, AZ


  • n/a OA procedure


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