2016/08/11 by Baldini, Edoardo, Mann, Andreas, Borroni, Simone +3
#FOS: Physical sciences #Instrumentation and Detectors (physics.ins-det) #Optics (physics.optics)
paper · doi:10.48550/arxiv.1608.03503
A femtosecond pump-probe setup is described that is optimised for broadband transient reflectivity experiments on solid samples over a wide range of temperatures. By combining a temporal resolution of 45 fs and a broad detection range between 1.75 and 2.85 eV, this apparatus can provide insightful information on the interplay between coherent collective modes and high-energy electronic excitations, which is one of the distinctive characteristics of strongly interacting and correlated quantum systems. The use of a single-shot readout CMOS array detector at frame rates up to 10 kHz allows to resolve coherent oscillations with amplitudes below 10-4 in ΔR/R. We demonstrate the operation of this setup on the prototypical charge-transfer insulator La2CuO4, revealing the presence of coherent optical phonons with frequencies as high as 13 THz.