Single-pulse picking at kHz repetition rates using a Ge plasma switch at the free-electron laser FELBE.
Single-pulse picking at kHz repetition rates using a Ge plasma switch at the free-electron laser FELBE.
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在自由电子激光器 FELBE 上使用 Ge 等离子体开关以 kHz 重复率进行单脉冲拾取。
DOI：
10.1063/1.4921864
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
M. Helm
中科院分区：
文献类型：
--
作者：
Johannes Schmidt;Johannes Schmidt;S. Winnerl;W. Seidel;C. Bauer;C. Bauer;M. Gensch;Harald Schneider;M. Helm;M. Helm
我们演示了一个从重复频率为13 MHz的自由电子激光器（FEL）FELBE中拾取中红外和太赫兹（THz）辐射脉冲的系统。单脉冲被反射的密集的电子空穴等离子体在Ge板，是光激发的放大近红外（NIR）激光系统工作在1 kHz和100 kHz的重复频率，分别。拾取脉冲的峰值强度比剩余脉冲的峰值强度大400倍。讨论了在5 ~ 30 μm波长范围内拾取脉冲所需的近红外能量密度。此外，我们表明，等离子体的反射率衰减的时间尺度从100 ps到1 ns依赖于自由电子激光和近红外激光的波长。等离子体开关使得需要高峰功率但较低平均功率的自由电子激光实验成为可能。此外，该系统非常适合研究衰减时间在μs到ms范围内的过程，即，比FELBE的77 ns长的脉冲重复周期长得多。
We demonstrate a system for picking of mid-infrared and terahertz (THz) radiation pulses from the free-electron laser (FEL) FELBE operating at a repetition rate of 13 MHz. Single pulses are reflected by a dense electron-hole plasma in a Ge slab that is photoexcited by amplified near-infrared (NIR) laser systems operating at repetition rates of 1 kHz and 100 kHz, respectively. The peak intensity of picked pulses is up to 400 times larger than the peak intensity of residual pulses. The required NIR fluence for picking pulses at wavelengths in the range from 5 μm to 30 μm is discussed. In addition, we show that the reflectivity of the plasma decays on a time scale from 100 ps to 1 ns dependent on the wavelengths of the FEL and the NIR laser. The plasma switch enables experiments with the FEL that require high peak power but lower average power. Furthermore, the system is well suited to investigate processes with decay times in the μs to ms regime, i.e., much longer than the 77 ns long pulse repetition period of FELBE.
影响因子：
41.2
作者：
E. Zibik;E. Zibik;Thomas Grange;Thomas Grange;B. A. Carpenter;N. E. Porter;R. Ferreira;G. Bastard;D. Stehr;S. Winnerl;Manfred Helm;Huiyun Liu;Huiyun Liu;M. S. Skolnick;L. R. Wilson
通讯作者：
E. Zibik;E. Zibik;Thomas Grange;Thomas Grange;B. A. Carpenter;N. E. Porter;R. Ferreira;G. Bastard;D. Stehr;S. Winnerl;Manfred Helm;Huiyun Liu;Huiyun Liu;M. S. Skolnick;L. R. Wilson
影响因子：
10.8
作者：
Jacob, Rainer;Winnerl, Stephan;Helm, Manfred
通讯作者：
Helm, Manfred