TUTCRIS - Tampereen teknillinen yliopisto

TUTCRIS

Edge filter enhanced self-mixing interferometry

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Yksityiskohdat

AlkuperäiskieliEnglanti
Sivut2814-2817
Sivumäärä4
JulkaisuOptics Letters
Vuosikerta40
Numero12
DOI - pysyväislinkit
TilaJulkaistu - 15 kesäkuuta 2015
OKM-julkaisutyyppiA1 Alkuperäisartikkeli

Tiivistelmä

Self-mixing interferometry (SMI) represents a simple, robust, and self-aligned technique for metrology applications. Still, its applicability on diffuse targets is limited to distances up to few meters. We present an enhanced approach based on the detection of the frequency-modulated (FM) self-mixing signal. The FM signal detection is achieved using an acetylene edge filter that maps laser frequency variations into intensity variations as the laser wavelength is tuned to the edge of the steep absorption profile. An experimental comparison between the enhanced and the conventional SMI approach is presented. The new approach yields to about two orders of magnitude larger signal-to-noise ratio and extends the applicability of SMI into new fields allowing longer detection ranges and lower backscattering signals. (C) 2015 Optical Society of America

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