Generation of Intense Vortex Gamma Rays via Spin-to-Orbital Conversion of Angular Momentum in Relativistic Laser-Plasma Interactions
| Autor: | X. T. He, Bin Qiao, X. B. Li, J. Wang, C. L. Zhong, C.T. Zhou, S.P. Zhu, Y. Xie, L. F. Gan |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Physics
Angular momentum Compton scattering Gamma ray Physics::Optics General Physics and Astronomy 02 engineering and technology Electron 021001 nanoscience & nanotechnology 01 natural sciences Vortex 0103 physical sciences Production (computer science) Atomic physics 010306 general physics 0210 nano-technology Spin (physics) Energy (signal processing) |
| Zdroj: | Physical Review Applied. 14 |
| ISSN: | 2331-7019 |
| Popis: | Vortex $\ensuremath{\gamma}$-ray beams with large orbital angular momentum (OAM) have significant potential applications in material science, nuclear detection, and astrophysics. An all-optical scheme for production of intense vortex $\ensuremath{\gamma}$-ray beams using relativistic laser-plasma interactions is proposed, where the OAM of $\ensuremath{\gamma}$-photons is converted from the spin angular momentum of circularly polarized (CP) lasers. The spin-to-orbital angular momentum conversion is achieved by two processes: resonant acceleration of electrons in CP laser-plasma interactions and nonlinear Compton scattering (NCS) of another linearly polarized laser from the former. Three-dimensional particle-in-cell simulations show that vortex $\ensuremath{\gamma}$-ray beams with a large and controllable OAM of $2.5\ifmmode\times\else\texttimes\fi{}{10}^{18}\ensuremath{\hbar}$ and energy up to hundreds of $\mathrm{MeV}$ can be obtained by using two lasers at intensities of approximately ${10}^{22}\phantom{\rule{0.2em}{0ex}}{\mathrm{W}/\mathrm{cm}}^{2}$, which is much more practical and more efficient than previously proposed NCS of a Laguerre-Gaussian beam. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|