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Measurements of displacement using the self-mixing interference in a laser diode

1998; Springer Science+Business Media; Volume: 29; Issue: 3 Linguagem: Inglês

10.1088/0150-536x/29/3/012

2056-7162

Noël Servagent, Flore Gouaux, Thierry Bosch,

Advanced Fiber Laser Technologies

A non-contact sensor using the self-mixing interference inside a CW single-mode laser diode has been designed to measure displacements. By using an appropriate signal processing based on the interpretation of the interfringe of the sawtooth-like optical power variations, a resolution of has been obtained for displacements up to several micrometres even in the case of hysteresis in the laser characteristics.