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.
© 2009 Optical Society of America
Original Manuscript: February 24, 2009
Revised Manuscript: August 3, 2009
Manuscript Accepted: August 4, 2009
Published: August 31, 2009
Dmitry V. Dylov and Jason W. Fleischer, "Spectral dynamics of spatially incoherent bump-on-tail instability," Opt. Lett. 34, 2673-2675 (2009)