Two-dimensional spectroscopy in the ultraviolet range by a birefringent delay line

Two-dimensional electronic spectroscopy (2DES) is a powerful spectroscopic technique for the study of energy and charge flow in biological systems, which has been successfully applied in the visible and infrared ranges. Its extension to the UV range (2DUV) is extremely promising for the study of biomolecules but poses several technical challenges: (i) the requirement of phase-locked pulse pairs; (ii) generation of few-optical UV pulses; (iii) dispersion management in the UV range. Here we present a 2DUV setup able to generate sub-20 fs UV phase-locked pulses whose delay is controlled with stability better than λ/350 [1].