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Sensors 2016, 16(5), 633; doi:10.3390/s16050633

Interferometric Sensor of Wavelength Detuning Using a Liquid Crystalline Polymer Waveplate

Department of Metrology and Optoelectronics, Faculty of Electronics, Telecommunications and Informatics, Gdańsk University of Technology, Narutowicza Street 11/12, 80-233 Gdańsk, Poland
Academic Editors: Vincenzo Spagnolo and Dragan Indjin
Received: 1 March 2016 / Revised: 20 April 2016 / Accepted: 25 April 2016 / Published: 9 May 2016
(This article belongs to the Special Issue Infrared and THz Sensing and Imaging)
View Full-Text   |   Download PDF [9094 KB, uploaded 9 May 2016]   |  

Abstract

Operation of a polarization interferometer for measurement of the wavelength changes of a tunable semiconductor laser was investigated. A λ/8 waveplate made from liquid crystalline polymer is placed in one of interferometers’ arms in order to generate two output signals in quadrature. Wavelength was measured with resolution of 2 pm in the wavelength range 628–635 nm. Drift of the interferometer, measured in the period of 500 s, was 8 nm, which corresponded to the change in the wavelength of 1.3 pm. If needed, wavelength-dependent Heydemann correction can be used to expand the range of operation of such interferometer. View Full-Text
Keywords: polarization interferometry; waveplate; liquid crystalline polymer; tunable laser; two-beam interferometer polarization interferometry; waveplate; liquid crystalline polymer; tunable laser; two-beam interferometer
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Wierzba, P. Interferometric Sensor of Wavelength Detuning Using a Liquid Crystalline Polymer Waveplate. Sensors 2016, 16, 633.

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