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Proceedings Paper

Modulated external-cavity laser for highly resolved distance measurements
Author(s): Juergen Czarske; Jasper Moebius; Thorsten Pfister; Thomas Mueller-Wirts
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Paper Abstract

An external cavity laser is assembled by using an antireflection coated laser diode together with the surface of a measurement object. The automatic evaluation of the longitudinal modespacing yields the distance between the laser diode and the measurement object. The measurement resolution is increased by utilizing the resonance effect due to synchronous pumping of the laser diode current. Thus, a distance sensor with interesting properties for industrial applications is set up. Nevertheless, a systematic measurement deviation arises as a result of the nonlinear properties of the laser diode. A fundamental understanding of the processes inside the laser diode is necessary for achieving a measurement uncertainty in the micrometer range. Seen applications are in-situ measurements at grinding processes or the focus control at laser material processing.

Paper Details

Date Published: 14 February 2005
PDF: 12 pages
Proc. SPIE 5776, Eighth International Symposium on Laser Metrology, (14 February 2005); doi: 10.1117/12.611689
Show Author Affiliations
Juergen Czarske, Laser Zentrum Hannover e.V. (Germany)
Jasper Moebius, Laser Zentrum Hannover e.V. (Germany)
Thorsten Pfister, Laser Zentrum Hannover e.V. (Germany)
Thomas Mueller-Wirts, TEM Messtechnik GmbH (Germany)


Published in SPIE Proceedings Vol. 5776:
Eighth International Symposium on Laser Metrology
R. Rodriguez-Vera; F. Mendoza-Santoyo, Editor(s)

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