Ultrafast tunable modulation of light polarization at terahertz frequencies

Juvé, Vincent and Vaudel, Gwenaëlle and Ollmann, Zoltan and Hebling, Janos and Temnov, Vasily and Gusev, Vitalyi and Pezeril, Thomas (2018) Ultrafast tunable modulation of light polarization at terahertz frequencies. Optics Letters, 43 (24). pp. 5905-5908. ISSN 0146-9592

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Abstract

Controlling light polarization is one of the most essential routines in modern optical technology. Since the demonstration of optical pulse shaping by spatial light modulators and its potential in controlling the quantum reaction pathways, it paved the way for many applications as a coherent control of the photoionization process or as polarization shaping of terahertz (THz) pulses. Here, we evidenced efficient non-resonant and noncollinear chi((2))-type light-matter interaction in femtosecond polarization-sensitive time-resolved optical measurements. Such nonlinear optical interaction of visible light and ultrashort THz pulses leads to THz modulation of visible light polarization in bulk LiNbO3 crystal. Theoretical simulations based on the wave propagation equation capture the physical processes underlying this nonlinear effect. Apart from the observed tunable polarization modulation of visible pulses at ultrahigh frequencies, this physical phenomenon can be envisaged in THz depth-profiling of materials.

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