期刊
OPTICS EXPRESS
卷 27, 期 16, 页码 23529-23538出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.27.023529
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资金
- National Natural Science Foundation of China [11675108, 11721091, 11774227, 11405108]
- National 1000 Youth Talent Project of China
- Science Challenge Project [TZ2018005]
- EPSRC [EP/R006202/1]
- EPSRC [EP/R006202/1] Funding Source: UKRI
- STFC [ST/P002056/1] Funding Source: UKRI
The interaction between laser light and an underdense plasma immersed in a spatio-temporally tunable magnetic field is studied analytically and numerically. The transversely nonuniform magnetic field can serve as a magnetic channel, which can act on laser propagation in a similar way to the density channel. The envelope equation for laser intensity evolution is derived, which contains the effects of magnetic channel and relativistic self-focusing. Due to the magnetic field applied, the critical laser power for relativistic self-focusing can be significantly reduced. Theory and particle-in-cell simulations show that a weakly relativistic laser pulse can propagate with a nearly constant peak intensity along the magnetic channel for a distance much longer than its Rayleigh length. By setting the magnetic field tunable in both space and time, the simulation further shows that the magnetized plasma can then act as a lens of varying focal length to control the movement of laser focal spot, decoupling the laser group velocity from the light speed c in vacuum. Published by The Optical Society under the terms of the Creative Commons Attribution 4.0 license.
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