2D IR spectroscopy with phase-locked pulse pairs from a birefringent delay line.
We introduce a new scheme for two-dimensional IR spectroscopy in the partially collinear pump-probe geometry. Translating birefringent wedges allow generating phase-locked pump pulses with exceptional phase stability, in a simple and compact setup. A He-Ne tracking scheme permits to scan continuously the acquisition time. For a proof-of-principle demonstration we use lithium niobate, which allows operation up to 5 μm. Exploiting the inherent perpendicular polarizations of the two pump pulses, we also demonstrate signal enhancement and scattering suppression.
Julien
J
Réhault
Margherita
M
Maiuri
Cristian
C
Manzoni
Daniele
D
Brida
Jan
J
Helbing
Giulio
G
Cerullo