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We directly image terahertz waves generated by optical rectification of tilted-pulse-front optical pulses in LiNbO3. The terahertz generation efficiency is highest when the pump-pulse tilt angle is equal to the THz Cherenkov angle.
Undoped and 0.56 at.% Sb‐doped ZnO thin films were prepared by pulsed laser deposition (PLD) under vacuum and an oxygen pressure of 0.2 Pa with sintered ceramic as targets. The effects of Sb doping and deposition atmosphere on structure and optical–electrical properties of the films were studied by X‐ray diffraction (XRD), scanning probe microscopy (SPM), Hall Effect measurement, transmittance spectra,...
Nonlinear dynamics of free-carriers in direct bandgap semiconductors at terahertz (THz) frequencies is studied using high power, few-cycle pulses. The physical mechanisms that give rise to such dynamics will be discussed in details.
Nonlinear dynamics of free-carriers in direct bandgap semiconductors at terahertz (THz) frequencies is studied using high power, few-cycle pulses. Techniques as Z-scan and THz-pump/THz-probe are employed to explore nonlinear interactions in both n-doped and photoexcited systems. The physical mechanism that gives rise to such interactions will be discussed in details.
A method based on multiple adaptive notch filters for tracking the frequency variations of the sensor output signal of Coriolis mass flowmeter is presented. For the simulated signal whose frequency, amplitude and phase are time-varying based on the random walk model, a lattice-based adaptive IIR notch filter (LANF) with fast convergence rate is applied to detect the signal frequency and track the...
We study ultrafast hot electron transport in n-doped InGaAs using polarization-sensitive nonlinear THz-pump/THz-probe spectroscopy. We observe an anisotropic effective mass for hot electrons due to the nonparabolicity of the conduction band.
Nonlinear dynamics of free carriers in direct bandgap semiconductors at terahertz (THz) frequencies is studied using the intense few-cycle source available at the Advanced Laser Light Source (ALLS). Techniques such as Z-scan and optical-pump/THz-probe are employed to explore nonlinear interactions in an n-doped InGaAs thin film and a photoexcited GaAs sample, respectively. The physical mechanism that...
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