Spectral dynamics of spatially incoherent bump-on-tail instability.
We examine an all-optical bump-on-tail instability by considering the nonlinear interaction of two partially incoherent spatial beams. Using a radiation transport approach, we develop plasmalike dispersion relations for perturbation modes and show that a positive gradient in the power spectrum can trigger instability. Theoretical considerations are confirmed by experiment and numerical simulation.
Dylov
Dmitry V
DV
Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544, USA.
Fleischer
Jason W
JW