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Browse Journals & Magazines > Review of Scientific Instrume ...> Volume:74 Issue:8 Help

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

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4 Author(s)
Heesong Jeong ; Department of Physics, Sogang University, 1 Sinsoo-Dong, Mapo-Goo, Seoul 121-742, Korea ; Kwak, Noh-Min ; Huh, Hyeongjun ; Cho, Kyuman

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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. © 2003 American Institute of Physics.

Published in:
Review of Scientific Instruments  (Volume:74 ,  Issue: 8 )

Date of Publication: Aug 2003

Page(s):
3664 - 3669
ISSN :
0034-6748
Digital Object Identifier :
10.1063/1.1588746
Product Type:
Journals & Magazines
Date of Current Version :
18 June 2009
Issue Date :
Aug 2003

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