Jianming Dai

TL;DR: The study of THz wave generation in the pulsed laser induced air plasma with individually controlled phase, polarization, and amplitude of the optical fundamental wave and its second harmonic indicates that the third-order nonlinear optical process mixing the omega and 2omega beams in the ionized plasma is the main mechanism of the efficient THZ wave generation.

TL;DR: By introducing the second-harmonic component of the white light in the laser-induced plasma as a local oscillator, coherent detection of broadband THz waves with ambient air is demonstrated for the first time.

TL;DR: The far-infrared absorption and index of refraction of high resistivity, float-zone, crystalline silicon has been measured by terahertz time-domain spectroscopy.

TL;DR: In this article, the authors used gases ionized by femtosecond pulses to generate and sense broadband terahertz pulses using a coherent heterodyne technique, using a recycled optical probe beam and coherent detection, offers a high field strength and time-resolved measurement.

TL;DR: Electrons ionized from an atom or molecule by circularly or elliptically polarized femtosecond omega and 2omega pulses exhibit different trajectory orientations as the relative phase between the two pulses changes, and the polarization of the terahertz wave emitted during the ionization process was found to be coherently controllable through the optical phase.