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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 52, Iss. 24 — Aug. 20, 2013
  • pp: 5894–5902

Synchronized Fabry–Perot cavity used for enhanced sensitivity electro-optic measurements of electric fields in the microwave range

Amin Amin, Philippe Antoine, Alain Cornet, Kamel Mallat, and Xavier Urbain  »View Author Affiliations

Applied Optics, Vol. 52, Issue 24, pp. 5894-5902 (2013)

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An electro-optic (EO) sensing system for measuring free-space electric fields in the microwave range has been developed. The system is based on a phase modulation heterodyning technique using a Mach–Zehnder interferometer. In one of the arms of the interferometer, an acousto-optic frequency shifter is used to downconvert the frequency of the detected signal in order to discriminate it from parasites emitted at the external electric field frequency. The sensing part is a LiTaO3 crystal placed in a Fabry–Perot cavity. The cavity aims at enhancing the sensitivity of the measurements. Cavity-based EO setups already used in the literature propose this sensitivity enhancement at the expense of the frequency bandwidth, whereas our setup allows this without a major impact on the frequency bandwidth. Electric fields are measured at both 15 kHz and 2.4 GHz with cavities of two different finesses; the best EO phase retardation gains obtained with the cavity are 34 and 60, respectively. The minimum detectable electric field is 0.003Vm1Hz1/2.

© 2013 Optical Society of America

OCIS Codes
(120.1880) Instrumentation, measurement, and metrology : Detection
(120.2230) Instrumentation, measurement, and metrology : Fabry-Perot
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(120.5050) Instrumentation, measurement, and metrology : Phase measurement
(230.1040) Optical devices : Acousto-optical devices

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: May 28, 2013
Revised Manuscript: July 12, 2013
Manuscript Accepted: July 12, 2013
Published: August 12, 2013

Amin Amin, Philippe Antoine, Alain Cornet, Kamel Mallat, and Xavier Urbain, "Synchronized Fabry–Perot cavity used for enhanced sensitivity electro-optic measurements of electric fields in the microwave range," Appl. Opt. 52, 5894-5902 (2013)

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