Plasma density ramp for relativistic self-focusing of an intense laser
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- Plasma density ramp for relativistic self-focusing of an intense laser
- Gupta, Devki N.; Hur, Min Sup; Hwang, Ilmoon; Suk, Hyyong; Sharma, Ashok K.
- Defocusing; Plasma density ramp; Self-focusing
- Issue Date
- OPTICAL SOC AMER
- JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS, v.24, no.5, pp.1155 - 1159
- It is known that a high-power laser propagating through an underdense plasma can acquire a minimum spot size due to relativistic self-focusing. Beyond the focus, the nonlinear refraction starts weakening, and the spot size of the laser increases, showing periodic self-focusing/defocusing behavior with the distance of propagation. To overcome the defocusing, we propose the introduction of a localized upward plasma density ramp. In the presence of an upward ramp of plasma density, the laser beam obtains a minimum spot size and maintains it with only a mild ripple. For suitable parameters of the laser and the plasma, we have deduced conditions for the self-focusing. This kind of plasma density ramp may be observed in a gas-jet plasma experiment and resembles a plasma lens.
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