High-field nonlinear optical response and phase control in a dielectric laser accelerator
High-field nonlinear optical response and phase control in a dielectric laser accelerator
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DOI：
10.1038/s42005-018-0047-y
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发表时间：
2018-08-17
影响因子：
5.5
通讯作者：
Wu, Z.
中科院分区：
文献类型：
--
作者：
Cesar, D.;Custodio, S.;Wu, Z.
超快激光技术和纳米纤维的进步使得基于小型化激光驱动光子结构的新型粒子加速器成为可能。然而，开发一个有用的加速器的基础上，这种方法需要控制的粒子动力学在接近损伤极限的场强。我们测量了一个熔融石英介质激光加速器的加速度高达9 GVm（-1）的字段驱动，并观察到一个记录1.8 GVm（-1）的加速模式。在这些强度下，电介质被驱动超过其线性响应，并且自相位调制改变加速模式的相速度，将平均梯度降低到850 MeVm（-1）。我们表明，自由空间光学可以用来补偿这种失相，并表明，定制的激光相位和振幅可以促进优化的光束动力学。这可以在单个阶段实现MeV规模的能量增益，并为科学，工业和医疗领域的应用铺平道路。
Advances in ultrafast laser technology and nanofabrication have enabled a new class of particle accelerator based upon miniaturized laser-driven photonic structures. However, developing a useful accelerator based on this approach requires control of the particle dynamics at field intensities approaching the damage limit. We measure acceleration in a fused silica dielectric laser accelerator driven by fields of up to 9 GVm(-1) and observe a record 1.8 GVm(-1) in the accelerating mode. At these intensities the dielectric is driven beyond its linear response and self-phase modulation changes the phase velocity of the accelerating mode, reducing the average gradient to 850 MeVm(-1). We show that free-space optics can be used to compensate this dephasing and demonstrate that tailoring the laser phase and amplitude can facilitate optimization of the beam dynamics. This could enable MeV scale energy gain in a single stage and pave the way towards applications in scientific, industrial, and medical fields.