5 October 2005 Microchip laser sensor of electromagnetic field
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We have developed the photonic sensor of electromagnetic field. The electrooptical phase modulator inserted in one laser cavity performs frequency modulation of the laser due to voltage induced in the antenna probe. The heterodyne detection allows to move the spectrum of modulated optical frequencies into the RF or microwave ranges. The issue of our solution is inserting of both lasers (signal and reference) in the common construction in order to minimize fluctuation of offset frequency. The pumping of the microchip lasers and transmission of the signal are guided via optical fibers. The setup can be all dielectric (apart of antenna). The sensitivity of laser tuning with an electrooptical modulator i.e. the value of frequency deviation due to driven voltage is linearly proportional to the free spectral range of the laser and inversely proportional to the "half-wavelength" voltage of an used modulator. In our case this sensitivity is about 10 MHz/V, with the free spectral range νq congruent to 28 GHz. The sensitivity is quite high, even when the offset frequency fluctuation, caused mainly by thermal drift, are taken in account. Apart from the heterodyne technique of optical FM detection we have introduce here detection with the external Fabry-Perot cavity
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Arkadiusz J. Antonczak, Krzysztof M. Abramski, "Microchip laser sensor of electromagnetic field", Proc. SPIE 5958, Lasers and Applications, 595809 (5 October 2005); doi: 10.1117/12.622683; https://doi.org/10.1117/12.622683

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