A Custom-Tailored Multi-TW Optical Electric Field for Gigawatt Soft-X-Ray Isolated Attosecond Pulses
A Custom-Tailored Multi-TW Optical Electric Field for Gigawatt Soft-X-Ray Isolated Attosecond Pulses
复制标题
DOI：
10.34133/2021/9828026
复制
发表时间：
2021-04
期刊：
影响因子：
--
通讯作者：
B. Xue;Yuuki Tamaru;Yuxi Fu;Hua Yuan;P. Lan;O. Mücke;A. Suda;K. Midorikawa;E. Takahashi
中科院分区：
文献类型：
--
作者：
B. Xue;Yuuki Tamaru;Yuxi Fu;Hua Yuan;P. Lan;O. Mücke;A. Suda;K. Midorikawa;E. Takahashi
自从2001年第一个孤立的阿秒脉冲通过高次谐波产生(HHG)被证实以来，研究人员对超短时间区域的兴趣已经扩大。然而，人们意识到相关研究的局限性，例如阿秒光谱学。瓶颈是缺少高峰值功率的孤立阿秒脉冲源。因此，目前，产生强烈的阿秒脉冲将是最优先的目标之一。在这篇文章中，我们回顾了我们最近所做的利用高次谐波产生千兆瓦量级的软X射线隔离阿秒脉冲(IAP)的TW类并行三通道波形合成器的工作。通过几种稳频方法，我们实现了一个稳定的50mJ三通道光波形合成器，其峰值功率在多TW级。由于所有参数的成功稳定，该光波形合成器能够产生稳定的强光场，以产生强的连续谐波光束。此外，还实现了逐镜头可重现合成波形的精度控制。通过采用松散聚焦几何的HHG过程，在一个Ar气室中产生了一个强的逐炮稳定的超连续谱(50-70 eV)。这种连续谱支持变换限制持续时间为170as的IAP和亚微焦耳脉冲能量，这允许产生GW规模的IAP。在软X射线区域的另一个超连续谱具有大约100-130 eV的较高光子能量，也是从合成器的霓虹气中产生的。变换极限脉冲宽度为106as。从而从实验上证明了通过优化波形合成可以提高高次谐波输出。
Since the first isolated attosecond pulse was demonstrated through high-order harmonics generation (HHG) in 2001, researchers’ interest in the ultrashort time region has expanded. However, one realizes a limitation for related research such as attosecond spectroscopy. The bottleneck is concluded to be the lack of a high-peak-power isolated attosecond pulse source. Therefore, currently, generating an intense attosecond pulse would be one of the highest priority goals. In this paper, we review our recent work of a TW-class parallel three-channel waveform synthesizer for generating a gigawatt-scale soft-X-ray isolated attosecond pulse (IAP) using HHG. By employing several stabilization methods, we have achieved a stable 50 mJ three-channel optical-waveform synthesizer with a peak power at the multi-TW level. This optical-waveform synthesizer is capable of creating a stable intense optical field for generating an intense continuum harmonic beam thanks to the successful stabilization of all the parameters. Furthermore, the precision control of shot-to-shot reproducible synthesized waveforms is achieved. Through the HHG process employing a loose-focusing geometry, an intense shot-to-shot stable supercontinuum (50–70 eV) is generated in an argon gas cell. This continuum spectrum supports an IAP with a transform-limited duration of 170 as and a submicrojoule pulse energy, which allows the generation of a GW-scale IAP. Another supercontinuum in the soft-X-ray region with higher photon energy of approximately 100–130 eV is also generated in neon gas from the synthesizer. The transform-limited pulse duration is 106 as. Thus, the enhancement of HHG output through optimized waveform synthesis is experimentally proved.