Magneto-optical Franz-Keldysh effect of an electron gas subjected to quantizing magnetic fields and intense terahertz laser fields

Theory of Gas Ionization by Intense Electromagnetic Fields

The distribution function of the electrons produced in the interaction between an intense electromagnetic wave and a neutral gas is derived and is shown to be nonequilibrium and anisotropic. By assuming that the time scale of gas ionization is much greater than the field period, it is shown that the electron distribution function formed in microwave and optical discharges has sharp anisotropy a...

Terahertz magneto-optical polarization modulation spectroscopy

We report the development of new terahertz (THz) techniques for rapidlymeasuring the complex Faraday angle in systems with broken time-reversal symmetry. Using the cyclotron resonance of a GaAs two-dimensional electron gas in a magnetic field, we have tested the performance of the techniques. We have made polarization modulation, high sensitivity (<1 mrad) narrowband rotation measurements with ...

Quantum interference and control of the dynamic Franz-Keldysh effect: Generation and detection of terahertz space-charge fields

Ultrafast and Nonlinear Spectroscopy of Solids with Small Energy Photons

Ultrashort pulses of intense, coherent, and tunable far-infrared (FIR) and mid-infrared (MIR) radiation, achievable with freeelectron lasers (FELs) and optical parametric amplifiers (OPAs), provide unique opportunities to investigate low energy dynamics in solids. This paper reviews our recent experiments on bulk and quantum-confined semiconductors using such radiation. These experiments includ...

Effects of intense laser pulse properties on wake field acceleration in magnetized plasma: Half-Sine Shape (HSS) and Gaussian Shape (GS) pulses

In this paper, we have simulated the excitation of wake fields in the interaction of an intensive laser pulses having Half-Sine and Gaussian time envelopes with a fully ionized cold plasma using particle in cell (PIC) method. We investigated the dependency of wake filed amplitude to different laser and plasma parameters such as laser wavelength, pulse duration and electron number density. In ad...