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Sensors 2016, 16(9), 1428; doi:10.3390/s16091428

Noise Suppression on the Tunable Laser for Precise Cavity Length Displacement Measurement

Institute of Scientific Instruments of Academy of Sciences of Czech Republic, v.v.i., Brno 61264, Czech Republic
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Academic Editor: Vittorio M.N. Passaro
Received: 3 July 2016 / Revised: 23 August 2016 / Accepted: 23 August 2016 / Published: 6 September 2016
(This article belongs to the Section Physical Sensors)
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Abstract

The absolute distance between the mirrors of a Fabry-Perot cavity with a spacer from an ultra low expansion material was measured by an ultra wide tunable laser diode. The DFB laser diode working at 1542 nm with 1.5 MHz linewidth and 2 nm tuning range has been suppressed with an unbalanced heterodyne fiber interferometer. The frequency noise of laser has been suppressed by 40 dB across the Fourier frequency range 30–300 Hz and by 20 dB up to 4 kHz and the linewidth of the laser below 300 kHz. The relative resolution of the measurement was 10 9 that corresponds to 0.3 nm (sub-nm) for 0.178 m long cavity with ability of displacement measurement of 0.5 mm. View Full-Text
Keywords: Fabry-Perot cavity; unbalance Michelson interferometer; noise suppression; heterodyne interferometry; displacement measurement Fabry-Perot cavity; unbalance Michelson interferometer; noise suppression; heterodyne interferometry; displacement measurement
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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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MDPI and ACS Style

Šmíd, R.; Čížek, M.; Mikel, B.; Hrabina, J.; Lazar, J.; Číp, O. Noise Suppression on the Tunable Laser for Precise Cavity Length Displacement Measurement. Sensors 2016, 16, 1428.

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