China's first high-power THz free electron laser saturated light
The first high-power THz free electron laser device independently researched and developed by our country's scientists has recently saturated for the first time in Chengdu, Sichuan Province. The third-party testing, the experiment is true and reliable and the device is stable. China's terahertz source has officially entered the free electron laser era.
August 29, by the China Institute of Engineering Physics, Institute of Applied Electronics led by the high average power THz free electron laser device (CTFEL) first saturated light, and to achieve stable operation. On September 20, after the expert panel test and the third party test of the 205th Research Institute of China Ordnance Industry, the THz frequency of the CTFEL device is stable at three frequency points of 1.99THz, 2.41THz and 2.92THz, and the average power is more than 10W, the highest Reaching 17.9W; the peak pulse power of micropulse is greater than 0.5MW, up to 0.84MW. By adjusting the beam energy and magnetic field strength, the output laser frequency can be continuously adjustable.
THz radiation generally refers to the electromagnetic radiation with a frequency in the range of 0.1 THz-10 THz, which lies between the microwave and the infrared light. It is the last wave (light) spectral interval which human beings have not yet fully understood and well utilized. The terahertz spectrum of matter (including emission, reflection, and transmission) contains a wealth of physical and chemical information, investigating the spectral response of the relevant species in this band, exploring its structural properties and the new physical content it reveals has become a new Research direction. Free-electron lasers (FELs) make it possible to realize high-power ideal terahertz sources with full coverage of the terahertz band on the same device due to their advantages of continuously adjustable frequency, large power, narrow linewidth, good directivity and strong polarization , So free-electron laser is currently the most promising high-power tunable coherent light source in this band.
CTFEL device is relying on the support of the Ministry of Science and Technology major national scientific instruments and equipment development "coherent strong terahertz source of scientific instruments and equipment development" project, started in 2011. As a new type of coherent terahertz source, CTFEL devices have important applications in materials, biomedicine and other fields.
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