Wu Y K, Yan J, Hao H, Li J Y, Mikhailov S F, Popov V G, Vinokurov N A, Huang S, Wu J
FEL Laboratory, TUNL and Department of Physics, Duke University, Durham, North Carolina 27708-0319, USA.
Budker Institute of Nuclear Physics, Novosibirsk 630090, Russia.
Phys Rev Lett. 2015 Oct 30;115(18):184801. doi: 10.1103/PhysRevLett.115.184801. Epub 2015 Oct 26.
With a wide wavelength tuning range, free-electron lasers (FELs) are well suited for producing simultaneous lasing at multiple wavelengths. We present the first experimental results of a novel two-color storage ring FEL. With three undulators and a pair of dual-band mirrors, the two-color FEL can lase simultaneously in infrared (IR) around 720 nm and in ultraviolet (UV) around 360 nm. We have demonstrated independent wavelength tuning in a wide range (60 nm in IR and 24 nm in UV). We have also realized two-color harmonic operation with the UV lasing tuned to the second harmonic of the IR lasing. Furthermore, we have demonstrated good power stability with two-color lasing, and good control of the power sharing between the two colors.
自由电子激光器（FEL）具有宽广的波长调谐范围，非常适合于产生多波长同时激射。我们展示了一种新型双色储存环自由电子激光器的首个实验结果。通过三个波荡器和一对双波段反射镜，该双色自由电子激光器能够在720nm左右的红外（IR）波段和360nm左右的紫外（UV）波段同时激射。我们已经证明了在宽范围内（红外波段60nm，紫外波段24nm）的独立波长调谐。我们还实现了紫外激射调谐到红外激射的二次谐波的双色谐波运行。此外，我们展示了双色激射时良好的功率稳定性，以及对两种颜色之间功率分配的良好控制。
