Patent ID: 8847164
Filing Date: 2014-09-30
Classification: G01N

Abstract:
1. Method for the one-shot measurement of the transient birefringence induced in an optical medium ( 12 ) by at least one terahertz perturbation ( 6 ), the method comprising a step of emission and spectral coding of a pulsed optical signal ( 2 ), characterised in that the coding step, which comprises the generation of a supercontinuum ( 3 ), is combined with a step of decoding the polarisation ellipticity of the supercontinuum induced by the perturbation ( 6 ) of the medium ( 12 ), by decomposition of the electrical field of the supercontinuum in two polarisation directions and simultaneous measurement of the intensities I s and I p of the two components, the one-shot measurement consisting of encoding the temporal profile of the terahertz perturbation on the spectral profile of a single pulse of the supercontinuum.