Actively stabilized optical feedback scheme for very stable, high sensitivity shear-force measurement

We present here an active feedback control scheme which can maintain the distance between a laterally vibrating tapered optical fiber tip (TOFT) and a one facet of a laser diode (LD) at optimum value to measure the vibration amplitude of the TOFT in an optical feedback shear-force measurement scheme...

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Bibliographic Details
Published in:Review of scientific instruments 2003-08, Vol.74 (8), p.3664-3669
Main Authors: Jeong, Heeseong, Kwak, Noh-Min, Huh, Hyeongjun, Cho, Kyuman
Format: Article
Language:English
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Summary:We present here an active feedback control scheme which can maintain the distance between a laterally vibrating tapered optical fiber tip (TOFT) and a one facet of a laser diode (LD) at optimum value to measure the vibration amplitude of the TOFT in an optical feedback shear-force measurement scheme. Extremely good sensitivity for measuring the vibration amplitude, 9.58×10 −2   pm /√ Hz for a metal coated TOFT, can be maintained for at least 6 h by use of an active stablization scheme. Using a linearized lasing model of the LD in the presence of optical feedback, we are able to determine the vibration amplitude and effective reflection coefficient of the TOFT.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.1588746