Time-domain measurement of optical activity by an ultrastable common-path interferometer

Preda, Fabrizio; Perri, Antonio; Réhault, Julien Emile; Dutta, Biplab; Helbing, Jan; Cerullo, Giulio; Polli, Dario (2018). Time-domain measurement of optical activity by an ultrastable common-path interferometer. Optics letters, 43(8), pp. 1882-1885. Optical Society of America 10.1364/OL.43.001882

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We introduce a novel configuration for the broadband mea-surement of the optical activity of molecules, combiningtime-domain detection with heterodyne amplification. A birefringent common-path polarization-division interferometer creates two phase-locked replicas of the input lightwith orthogonal polarization. The more intense replica interacts with the sample, producing a chiral free-inductiondecay field, which interferes with the other replica, acting as a time-delayed phase-coherent local oscillator. By recording the delay-dependent interferogram, we obtain by a Fourier transform both the circular dichroism and circular birefringence spectra. Our compact, low-cost setup accepts ultrashort light pulses, making it suitable for measurement of transient optical activity.

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