We present a new scheme, the ion-ripple laser, for generating tunable coherent radiation ranging from microwaves to the ultraviolet. A relativistic electron beam obliquely propagating through an ion ripple excites electromagnetic radiation which is coupled to a negative-energy electrostatic wave via backward Raman scattering. The radiation peaks at a resonance frequency of cos. We derive the fluid theory dispersion relation for wave coupling and estimate the nonlinear saturation level. A 1 2/2 D PIC simulation code is used to verify the theory and scaling laws.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)