Publications by authors named "Adrien Longa"
Article Synopsis
- The article details a newly designed laser source specifically for time- and angle-resolved photoemission spectroscopy (TR-ARPES) aimed at investigating electron dynamics in quantum materials.
- The laser system utilizes a combination of a ytterbium-doped laser, optical parametric amplifier (OPA), and difference frequency generation (DFG) to produce tunable near- and mid-infrared pulses, along with ultraviolet pulses for exciting materials like BiTe.
- The authors showcase the stability of the laser source and present initial TR-ARPES results, highlighting its effectiveness in studying electronic behaviors in topological insulators.
We demonstrate experimentally that frequency resolved optical switching (FROSt) can be used to characterize ultra-broadband pulses at high repetition rates up to 500 kHz. Specifically, we present the complete temporal characterization of an optical parametric amplifier (OPA), from the supercontinuum (SC) to the second stage of amplification. Simultaneous characterization of co-propagating signal and idler pulses enables retrieval of their group delay, as well as their temporal phase and intensity.
View Article and Find Full Text PDFIn this work, we demonstrate the sensitivity of the frequency-resolved optical switching (FROSt) technique to detect a small amount of spectral phase shift for the precise characterization of ultrashort laser pulses. We characterized fs pulses centered at 1.75 µm that are spectrally broadened up to 700 nm of bandwidth in a hollow-core fiber and subsequently compressed down to 2.
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