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Using intense, few-cycle THz pulses we investigate the strong-field interaction with polarons in La0.7Ca0.3MnO3. By probing the optical reflectivity, we observe a THz-induced detrapping of electrons from polarons, followed by thermalization of phonons with spins.
We demonstrate a powerful, table-top approach for directly visualizing crystal lattice dynamics using optical second harmonic generation after intense terahertz photoexcitation of a specific phonon mode in the topological insulator Bi2Se3.
We have used ultrafast THz spectroscopy to both excite and probe low energy excitations in two-dimensional electron gases, topological insulators, and multiferroics.
We directly resolve energy transfer pathways from electrons to magnons in multiferroic HoMnO3 using ultrafast optical/terahertz spectroscopy. This reveals that energy is initially transferred from electrons to phonons and subsequently to magnons through spin-lattice relaxation.
Carrier dynamics in graphene at low energies are studied using two-dimensional THz spectroscopy. Pump-probe signals much faster than the acoustic phonon energy are observed due to a combination of intra- and interband absorption.
Using visible/NIR pump and strong THz probe pulses, we observe the THz field emitted by accelerated photoelectrons in n-type GaAs. A transition from ballistic to drift motion is observed.
We introduce an ultrashort laser pulse compressor that uses a single-prism and a single-grating. It is compact and automatically aligned and compensates for significant second- and third-order material dispersion. This design inherently has unity beam magnification and automatically contributes zero spatiotemporal distortions to the pulse, thus avoiding spatial chirp, angular dispersion, pulse-front...
Using a high spatial and temporal-resolution pulse measurement technique (SEA TADPOLE), we make direct measurements of the spatiotemporal field of ultrashort Bessel-X pulses. Their propagation invariance and superluminal velocity are measured and verified with simulations.
We introduce single-grating and single-grism pulse compressors, which are compact and automatically aligned for distortion-free output, and the latter of which compensates for significant material dispersion up to third order.
Using SEA TADPOLE with mum-range spatial and fs-range temporal resolution, we report the first direct spatiotemporal measurements of ultrashort Bessel-X pulses. We demonstrate their propagation invariance and superluminal velocity and verify our results with simulations.
We demonstrate a spectral interferometer with NSOM probes for measuring focusing ultrashort pulses with high spatial and temporal resolution. We measure a 0.26 NA focus and, for the first time, we observe the forerunner pulse.
We present two techniques for measuring the complete spatio-temporal intensity and phase, E(x,y,z, t), of an ultrashort pulse, one in and near a focus and the other for a single pulse.
A new high-spectral-resolution and experimentally simple spectral-interferometry method for measuring the intensity and phase of potentially complicated ultrashort pulses, which we call SEA TADPOLE is introduced. This SEA TADPOLE can exhibit spectral super-resolution. Other notable properties of SEA TADPOLE are that its entrance is an optical fiber with a core size of only a few mum (or less) and...
We present the first technique for measuring the complete spatio-temporal intensity and phase of an ultrashort pulse in and near a focus. Our method uses a variant of spectral interferometry (SEA-TADPOLE) that we recently introduced.
We present a simplified, alignment-free version of spectral interferometry using optical fibers. Spectral resolution is significantly improved using spatial fringes, avoiding time-domain filtering. We demonstrate this technique by measuring temporal chirp and a 12-ps double-pulse.
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