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We theoretically model the nonlinear dynamics of plasmonic waves in gold nanowires. We find that the thermo-modulational nonlinearity of gold leads to a strong spectral redshift of input pulses in a few microns of propagation.
Photoluminescence as a function of the time delay between two ultrafast laser pulses measures the nonlinear emission dynamics of quantum dots coupled to photonic crystal cavities and distinguishes between exciton and biexciton emission.
We present results on attosecond transient absorption in small molecules. Ultrafast relaxation dynamics in nitrogen can be temporally resolved by combining an isolated attosecond pulse and an intense synchronized carrier-envelope-phase stable infrared pulse. The lifetime of the different Fano resonances can be retrieved.
We track the collective terahertz free-carrier response of 1T-TiSe2 during femtosecond photo-induced melting and recovery of a charge density wave. The formation of charge order is highly sensitive to the transient excess carrier density, suggesting a strong excitonic influence.
An XUV continuum supporting 280 as isolated attosecond pulses is generated in argon with a 200 mJ, 17 fs Ti:Sapphire laser using the GDOG technique. The energy of the XUV pulse is over 100 nJ at generation location.
This work reports on the attosecond real-time observation of the electron processes [1] underlying the ability of ultrastrong few-cycle laser pulses to turn a dielectric solid from an insulating into a conducting state [2].
I present a new cross-correlation frequency resolved optical gating (X-FROG) algorithm, based on the principal components generalized projections (PCGP) algorithm that is fast, robust, and simple.
In semiconductors, the quantum trajectories of electron-hole pairs under strong terahertz fields accumulate Berry phases. For monolayer MoS2 with time-reversal related valleys, the Berry phases appear as the Faraday rotation angles of the emission signal.
We experimentally demonstrate coherent spectral phase encoded optical code-division multiple access that fully suppresses multiple access interference and speckle noise for the first time without the need for fast nonlinear time gating.
The optical nonlinearities of the chalcogenide Ge28Sb12Se60 are studied using the z-scan technique with femtosecond and picosecond laser pulses at 1.0 μm. Results indicate this glass shows promise for nonlinear optical waveguide devices.
We have demonstrated amplitude modulation of terahertz quantum cascade lasers by means of the injection of near-infrared laser pulses. Injected 770nm and 1350nm laser pulses both strongly suppressed the output power.
We demonstrated a high contrast 1053 nm femtosecond laser by exchanging the signal and idler in two stages non-collinear optical-parametric amplifier, 60 μI idler with measurement-limited contrast of 2.3×1011 was obtained within scale of sub-10 ps.
We present results from an optical communications testbed demonstrating polar coded pulse position modulation transmitted to a direct detection receiver. Using weak coherent states we achieve a photon information efficiency of 4.8 bits per received photon.
We measured pulsed THz emission from high-mobility MBE grown InGaAs/InAlAs multi-nanolayer structures. The detected average THz power was 32 μW at 32 mW optical excitation power. The bandwidth of the THz pulses exceeds 4 THz.
A novel two-color excitation scheme is discussed for generation of broadband white-light continua with superior coherence properties in photonic crystal fibers. These continua promise compression into the single-cycle regime.
We experimentally demonstrate that utilizing plasmonic contact electrodes enhances the optical-to-terahertz conversion efficiency of photoconductive terahertz emitters and offers more than 50-times higher radiation powers compared to conventional photoconductive terahertz emission techniques without plasmonic electrodes.
The optical Kerr response of hydrogen atom submitted to a strong and short near infrared laser pulse excitation is studied by solving the full 3D time-dependent Schro¨dinger equation. The nonlinear polarization evaluated at the driving field frequency is compared to the canonical expression derived from perturbation theory. A discrepancy between the two models is observed at large intensity affecting...
The potential of Ho3+, Tm3+ and Cr2+-doped gain media are investigated as amplifying media for the implementation of 2-μm wavelength beam lines meeting the requirements of OPCPA pumping.
We have proposed and developed a scanning laser terahertz (THz) imaging system using a 1.56μm femtosecond fiber laser for high-spatial resolution and high-speed measurement. The laser pulses are scanned over a 2D THz emitter plate such as DASC(4'-dimenthylamino-N-methyl-4-stilbazolium p-chlorobenzenesulfonate), GaAs, and ZnTe crystals by a galvano meter. In this system, THz wave pulses locally generated...
We extend the time-transformation technique to include the delayed Raman response and apply it to study the impact of the width of few-cycle optical pulses on intrapulse Raman scattering and dispersive wave generation.
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