Shanghai Jiaotong University Zhang Jie academician team made strong terahertz radiation source research has made important progress
It is learned from Shanghai Jiao Tong University that important progress has been made in the research of the strong terahertz radiation source based on the relativistic laser plasmas by the research team of academician Zhang Jie of the Department of Physics and Astronomy of the university. Relevant research results were published in the "Physical Express". THz radiation is located between mid-infrared and microwave radiation. It has the unique advantages of low photon energy and spectrum "fingerprint" and has important applications in materials science, biomedicine and national defense and other fields. However, the lack of large-energy terahertz radiation sources is one of the key bottlenecks limiting its development. Shanghai Jiao Tong University Zhang Jie, Sheng Zhengming et al and the Physics Department of the Chinese Academy of Sciences Li Yutong formed a team of relativistic laser - solid target interaction to produce a new way of terahertz radiation exploration for more than 10 years. Recently, the team Liao Guoqian and Yuan Xiaohui made use of the 200TW laser unit of Shanghai Jiaotong University Laser and Plasma Education Laboratory to generate a terahertz pulse with a single energy of nearly 400 micro-Joules after the target, which is related to the terahertz pulse generated by a large accelerator The energy is quite The physical image produced by terahertz radiation is: Relativistic laser interaction with the plasma produces a large amount of forward superheated electrons that, when escaping from the rear surface of the target to the vacuum, activate the transitional radiation. Since the pulse duration of the electron beam is on the order of tens of femtoseconds to picoseconds, the coherent radiation wavelength is in the terahertz band. Experiments also found that the ion beam and terahertz radiation showed asynchronous changes, indicating that the mechanism of terahertz radiation and ion acceleration is not the same, which is different from the current international mainstream understanding. Experts believe that the results not only open up new avenues for miniaturization, high energy and broad-spectrum terahertz radiation sources, but also are expected to develop into a new method for on-line diagnosis of laser plasma interactions. Claas Replacement Parts, Claas Harvester Parts, Claas Combine Harvester, Claas Agricultural Equipment Ningbo Combine Machinery Co.,Ltd. , http://www.combine-harvester-parts.com