We study theoretically the exchange of angular momentum between electromagnetic and electrostatic waves in a plasma, due to the stimulated Raman and Brillouin backscattering processes. Angular momentum states for plasmon and phonon fields are introduced for the first time. We demonstrate that these states can be excited by nonlinear wave mixing, associated with the scattering processes. This could be relevant for plasma diagnostics, both in laboratory and in space. Nonlinearly coupled paraxial equations and instability growth rates are derived.
|Translated title of the contribution||Stimulated Raman and Brillouin backscattering of collimated beams carrying orbital angular momentum|
|Number of pages||4|
|Journal||Physical Review Letters|
|Early online date||8 May 2009|
|Publication status||Published - May 2009|
- Nonlinear phenomena: waves wave propagation and other interactions
- Optical angular momentum and its quantum aspects