Abstract-Varying pre-plasma properties to boost terahertz wave generation in liquids

                                                        Communications Physics

Evgenia A. Ponomareva, Azat O. Ismagilov, Sergey E. Putilin, Anton N. Tsypkin, Sergei A. Kozlov,  Xi-Cheng Zhang,  

https://www.nature.com/articles/s42005-020-00511-1

Laser-driven nonlinear phenomena can both reveal the structural features of materials and become the basis for the development of various translated technologies, including highly intense terahertz sources. Here we realize a modified single-color double-pulse excitation scheme for enhancing the terahertz wave generation in flat liquid jets, and we show that the pre-ionization effect is crucial for finding the optimal input conditions. The experimental results, being supported by numerical simulations, reveal the preference for longer pre-pulses to induce the effective ionization process and shorter signals for the strong laser-plasma interaction. In addition to the identified features of the terahertz wave energy enhancement with respect to the duration change for both pulses and their ratio variation, we state the possibility of achieving the optical-to-THz conversion efficiency value up to 0.1% in the case of double-pulse excitation of an α-pinene jet.

Abstract-Wireless Data Transmission Method Using Pulsed THz Sliced Spectral Supercontinuum

Yaroslav V. Grachev,  Xinrui Liu, Sergey E. Putilin,  Anton N. Tsypkin,   Victor G. Bespalov,  Sergei A. Kozlov, Xi-Cheng Zhang

https://ieeexplore.ieee.org/document/8119558/

A method of ultrafast wireless information transmission using spectrum-sliced supercontinuum (SC) along the THz frequency range is presented in this letter. The THz spectrum-sliced SC was formed by femtosecond optical pulses doubled in a Michelson interferometer before being input onto a MgO:LiNbO3-THz generator. Two THz pulses generated by femtosecond pulses within a MgO:LiNbO3-crystal provided the spectrum-sliced SC in the spectral domain, which was recorded by an electro-optical detection system. The transmission rate in this method is determined by the bandwidth of the THz spectrum, the number of spectral lines in the SC, and the pulse repetition rate. We have demonstrated an SC containing 31 spectral lines with 23-GHz spacing within the range from 0.04 to 0.75 THz. The signal with encoded information was successfully transmitted over 2.4 m in free-space.

Abstract-Wireless data transmission method using pulsed THz sliced spectral supercontinuum

 Yaroslav V. Grachev,  Xinrui Liu, Sergey E. Putilin, Anton N. Tsypkin,   Victor G. Bespalov,  Sergei A. Kozlov,   Xi-Cheng Zhang

http://ieeexplore.ieee.org/document/8119558/

A method of ultrafast wireless information transmission using spectrum-sliced supercontinuum (SC) along the THz frequency range is presented in this manuscript. The THz spectrum-sliced SC was formed by femtosecond optical pulses doubled in a Michelson interferometer before being input onto a MgO:LiNbO3 THz generator. Two THz pulses generated by femtosecond pulses within a MgO:LiNbO3 crystal provided the spectrum-sliced SC in the spectral domain, which was recorded by an electro-optical detection system. The transmission rate in this method is determined by the bandwidth of the THz spectrum, the number of spectral lines in the SC, and the pulse repetition rate. We have demonstrated a SC containing 31 spectral lines with 23 GHz spacing within the range from 0.04 to 0.75 THz. The signal with encoded information was successfully transmitted over 2.4 meters in free-space.