- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
Intense circularly polarized attosecond pulse generation from solid targets irradiated with a two-color linearly polarized laser
摘要： A method for the production of intense circularly polarized (CP) attosecond pulses from relativistic laser-solid interactions is proposed, where a two-color linearly polarized (LP) laser is used. The polarization, photon frequency, and other properties of the obtained attosecond pulse can be controlled by adjusting the ratio of the dichromatic driving LP field in different harmonics, which is much easier and more efficient than those previously using CP driving lasers. Both one- and two-dimensional particle-in-cell simulations show that a CP attosecond extreme-ultraviolet pulse with an intensity of 1.4 × 1019 W/cm2 and a duration of about 120 as is obtained by a two-color LP laser at intensities in the fundamental and second harmonics of, respectively, 1.5 × 1022 and 6.4 × 1021 W/cm2, which can be applied for the detection of the magnetic and chiral properties of materials.
关键词： relativistic laser-solid interactions,attosecond pulse,two-color linearly polarized laser,circularly polarized,extreme-ultraviolet pulse
更新于2025-09-23 15:21:01
-
Electron Acceleration in Direct Laser-Solid Interactions Far Beyond the Ponderomotive Limit
摘要： In laser-solid interactions, electrons may be generated and subsequently accelerated to energies of the order of magnitude of the ponderomotive limit, with the underlying process dominated by direct laser acceleration. The breaking of this limit, realized here by a radially polarized laser pulse incident upon a wire target, can be associated with several novel effects. Three-dimensional particle-in-cell simulations show that a relativistic intense laser pulse can extract electrons from the wire and inject them into the accelerating field. Antidephasing, resulting from collective plasma effects, is shown here to enhance the accelerated electron energy by 2 orders of magnitude compared to the ponderomotive limit. It is demonstrated that ultrashort radially polarized pulses produce superponderomotive electrons more efficiently than pulses of the linear and circular polarization varieties.
关键词： laser-solid interactions,ponderomotive limit,antidephasing acceleration,radially polarized laser pulse,electron acceleration
更新于2025-09-19 17:13:59
-
Effect of Small Focus on Electron Heating and Proton Acceleration in Ultrarelativistic Laser-Solid Interactions
摘要： Acceleration of particles from the interaction of ultraintense laser pulses up to 5 × 1021 W cm?2 with thin foils is investigated experimentally. The electron beam parameters varied with decreasing spot size, not just laser intensity, resulting in reduced temperatures and divergence. In particular, the temperature saturated due to insufficient acceleration length in the tightly focused spot. These dependencies affected the sheath-accelerated protons, which showed poorer spot-size scaling than widely used scaling laws. It is therefore shown that maximizing laser intensity by using very small foci has reducing returns for some applications.
关键词： proton acceleration,focal spot size,ultrarelativistic laser-solid interactions,electron heating,laser intensity
更新于2025-09-16 10:30:52