Theoretical modeling of the laser feedback technique for length measurement of moving materials

Thomas Allgeier; Heinrich A. Hoefler; Elmar E. Wagner

doi:10.1117/12.364287

21 September 1999 Theoretical modeling of the laser feedback technique for length measurement of moving materials

Thomas Allgeier, Heinrich A. Hoefler, Elmar E. Wagner

Proceedings Volume 3824, Optical Measurement Systems for Industrial Inspection; (1999) https://doi.org/10.1117/12.364287
Event: Industrial Lasers and Inspection (EUROPTO Series), 1999, Munich, Germany

Abstract

This paper reports a theoretical description of a recently proposed length sensor using the laser-feedback technique. It is found that the optical feedback causes a sinusoidal fluctuation of the emission frequency with respect to time. The amplitude of the fluctuation strongly depends on the power reflectivity of the target and therefore the target distance. For target power reflectivities below 10^-4 stable single-mode laser oscillation is maintained and accurate measurements of target displacement are possible. Good agreement between theoretically calculated device output and measured device output has been obtained. Furthermore typical application examples for dielectric and metallic target materials are presented and some performance characteristics are discussed.

Citation Download Citation

Thomas Allgeier, Heinrich A. Hoefler, and Elmar E. Wagner "Theoretical modeling of the laser feedback technique for length measurement of moving materials", Proc. SPIE 3824, Optical Measurement Systems for Industrial Inspection, (21 September 1999); https://doi.org/10.1117/12.364287

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