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We report extreme nonlinear carrier dynamics in highly n-doped In0.53Ga0.47As thin film using terahertz time-domain spectroscopy. We attribute our observations to the dramatic reduction of terahertz photoconductivity induced by strong intervalley scattering effects.
We investigate intense broadband terahertz radiation generation based the interaction of high intensity ultrashort laser with solid plasma. THz pulse with electric field of hundreds of MV/cm are generated using laser with intensity of about 1018 W/cm2. Theoretical model, simulations agree well with experiments, and reveal that the THz radiation is coherent transition radiation by hot electrons produced...
High-energy, few-cycle THz pulse generation by high-intensity (∼1018 W/cm2) femtosecond laser with plasma mirrors have received significant attention in recent years [1-3]. This novel THz source has the potential of generating large bandwidth millijoule pulse energies, opening up applications in THz nonlinear optics, single-shot imaging and spectroscopy [4]. Solid density plasma shaping has already...
We studied the influence of the gap-size onto the generation of intense THz pulses from ZnSe interdigitated photoconductive antennas. We demonstrated that the waveform and the peak electric field depend strongly on this parameter.
We study the nonlinear ultrafast carrier dynamics in highly n-doped In0.53Ga0.47As using terahertz (THz) time-domain spectroscopy (THz-TDS). In addition to the bleaching effect, we further observe significant THz waveform modulations and high frequency generations.
We report the generation of asymmetric quasi-half-cycle THz pulses with an energy up to 8.3 J generated from a ZnSe interdigitated Large Aperture Photoconductive Antenna (ILAPCA). The THz peak electric field is 331 kV/cm with a spectrum characterized by a median frequency of 0.28 THz, resulting in ponderomotive energy of 15 eV. We observed that the large capacitance of the LAPCA leads to a decrease...
We demonstrate the generation of half-cycle terahertz pulses with elliptical polarization and 167 nJ pulse energy. These pulses have been generated using a 6H-SiC Large Aperture Photo-conductive Antenna (LAPCA) covered with a binary phase mask and excited by a 400 nm laser. We show that by changing the thickness of the phase mask and the geometry of the LAPCA it is possible to generate intense half-cycle...
We investigate the terahertz generation efficiency dependence as function of the pulse width durations at 800 nm. Our results confirmed conversion efficiency of 0.35% with saturation at 240 fs of pulse width duration.
We investigate terahertz (THz) radiation from 6H- and 4H-SiC photoconductive (PC) antennas excited at 400 and 800 nm wavelengths. We demonstrate that 6H-SiC large aperture PC antennas have the potential to generate sub-MV/cm THz fields.
We investigate the generation of free-space terahertz (THz) radiation from photoconductive antennas using single crystal and polycrystalline ZnSe substrates. The photoconductive antennas have been excited above (400 nm) and below (800 nm) the bandgap. We investigate the dependence of the THz electric field radiated from biased ZnSe emitters on the applied bias field and on the incident optical fluence...
We investigate Terahertz (THz) radiation from a ZnSe large aperture photoconductive antenna (LAPCA). The saturation fluence is seen to be significantly different for above and below band-gap excitation, and in comparison to GaAs substrates, shows strong potential as a high-power THz emitter.
There has recently been a surge of new laser-based techniques for generating intense, few-cycle terahertz (THz) pulses, thus opening new applications, such as studying the nonlinear optical properties of various materials at THz frequencies. Simultaneously, innovative solutions for broadband THz detection were found, allowing one to sense matter in the THz range with high temporal resolution. In this...
We report on an improved and robust scheme for the generation of terahertz (THz) waves via a two-color plasma source, based on the use of an off-axis parabolic mirror.
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