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自由电子激光(以下简称FEL)是基于使用高能电子直接产生相干辐射的新概念,不同于一般激光之基于能级跃迁的原理。它是加速器技术、激光技术、微波技术和一些其他高技术交融、交汇的综合体。它有优于其他光源的许多特点,如波长在一个波段内连续可调,功率潜力巨大,光束质量可达衍射极限,可产生超短脉冲等。它与一般激光相比,两者都是相干光,但它却有波长容易连续调变的优点,与同步辐射相比,两者都可覆盖宽广的波带,但它却是相干辐射,而相干电磁辐射对人类生活和科技进步已作出的贡献,如无线
Free Electron Laser (FEL) is a new concept based on the direct generation of coherent radiation using high-energy electrons, which is different from the principle of energy level transition of general laser. It is a combination of accelerator technology, laser technology, microwave technology and some other high-tech convergence. It has many advantages over other light sources such as continuously adjustable wavelength in one wavelength band, huge power potential, beam quality up to diffraction limit, and generation of ultra-short pulses. Compared with normal lasers, both of them are coherent light, but they have the advantage of easy continuous wavelength modulation. Both of them can cover a wide range of wavelengths compared with synchrotron radiation but they are coherent radiation. However, The contribution of coherent electromagnetic radiation to human life and advances in science and technology, such as wireless