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Resonant Faraday effect in a Fabry–Perot cavity

Sycz K., Gawlik W., Zachorowski J.

Optica Applicata

2010

Vol. 40, nr 3

633--639

A standard approach to Faraday effect in a Fabry–Perot cavity is extended to resonant absorbing media. The analysis indicates that application of the cavity improves a magnetometric sensitivity despite the resonant absorption. The degree of this improvement depends strongly on the medium’s density and is maximal for diluted media. The best effect is expected with rarified media and/or with weak optical transitions.

Sensitive detection of NO2 with cavity enhanced spectroscopy

Wojtas J, Czyżewski A, Stacewicz T, Bielecki Z

Optica Applicata

2006

Vol. 36, nr 4

s. 461--467

We present an experiment with nitrogen dioxide (NO2) detection with the use of cavity enhanced spectroscopy. The pulsed blue diode laser working at 414 nm as a light source was applied. The cavity was composed of two mirrrors with the reflectivity of R = 0.99992. The off-axis adjustment of the resonator was used. The absorbing gas concentration was determined by the measurement of the decay time of the light pulse trapped in the cavity. The detection limit better than 1 ppb was obtained.