Generating optical supercontinuum and frequency comb in tenuous plasmas
arXiv:2103.14678 · doi:10.1063/5.0052829
Abstract
There are several mechanisms by which the frequency spectrum of a laser broadens when it propagates at near-relativistic-intensity in tenuous plasma. Focusing on one dimensional effects, we identify two strong optical nonlinearities, namely, four-wave mixing (FWM) and forward Raman scattering (FRS), for creating octave-wide spectra. FWM dominates the interaction when the laser pulse is short and intense; Its combination with phase modulation produces a symmetrically broadened supercontinuum. FRS dominates when the laser pulse is long and relatively weak; It broadens the laser spectrum mainly towards lower frequencies and produces a frequency comb. The creation of the supercontinuum and frequency combs only frequency modulates, but does not compress, the laser pulse.
References in corpus (9)
- 20 years of developments in optical frequency comb technology and applications
- Femtosecond x rays from laser-plasma accelerators
- Effective suppression of parametric instabilities with decoupled broadband lasers in plasma
- Plasma optical modulators for intense lasers
- Resonance absorption of a broadband laser pulse
- Towards Megajoule X-ray Lasers via Relativistic 4-Photon Cascade in Plasma
- Resonant four-photon scattering of collinear laser pulses in plasma
- Nonlinear evolution of the plasma beatwave: Compressing the laser beatnotes via electromagnetic cascading
- Suppression of power losses during laser pulse propagation in underdense plasma slab