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Updated: Mar 9, 2026

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators
Published on: May 30, 2014
A versatile setup for ultrafast broadband optical spectroscopy of coherent collective modes in strongly correlated
Edoardo Baldini, Andreas Mann1, Simone Borroni1
1Laboratory for Ultrafast Microscopy and Electron Scattering and the Lausanne Centre for Ultrafast Science , IPHYS, Station 6, École Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland.
Abstract:
A femtosecond pump-probe setup is described that is optimised for broadband transient reflectivity experiments on solid samples over a wide temperature range. By combining high temporal resolution and a broad detection window, this apparatus can investigate the interplay between coherent collective modes and high-energy electronic excitations, which is a distinctive characteristic of correlated electron systems. Using a single-shot readout array detector at frame rates of 10 kHz allows resolving coherent oscillations with amplitudes <10-4. We demonstrate its operation on the charge-transfer insulator La2CuO4, revealing coherent phonons with frequencies up to 13 THz and providing access into their Raman matrix elements.
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