2018/06/18 by Johannes Mund, D. Fröhlich, Dietmar Fröhlich +4 · 36 citations
Chemistry · Physics and Astronomy · #Atomic physics #Condensed matter physics #Excitation #Exciton #Femtosecond #Laser #Optics #Physics #Quantum mechanics #Second-harmonic generation #Semiconductor Quantum Structures and Devices #Spectrometer #Spectroscopy #Spectroscopy and Laser Applications #Spectroscopy and Quantum Chemical Studies #physics.optics
paper · pdf · doi:10.1103/physrevb.98.085203
published in Physical review. B./Physical review. B 98(8) (American Physical Society) · 9 pages, 8 figures
arxiv created 2018/06/18 · openalex created_date 2018/06/29 · openalex publication_date 2018/08/08 · arxiv updated 2018/08/15 · openalex updated_date 2026/08/05
We present a spectroscopic technique for second harmonic generation (SHG) using femtosecond laser pulses at a 30-kHz repetition rate, which nevertheless provides high spectral resolution limited only by the spectrometer. The potential of this method is demonstrated by applying it to the yellow exciton series of Cu2O. Besides even parity states with S and D envelopes, we also observe odd parity P excitons with linewidths down to 100 \ensuremathμeV, despite the broad excitation laser spectrum with a full width at half maximum of 14 meV. The underlying light-matter interaction mechanisms of SHG are elaborated by a group theoretical analysis which allows us to determine the linear and circular polarization dependencies, in good agreement with experiment.