Stimulated Compton scattering of surface plasma wave excited over metallic surface by a laser

A high-frequency surface plasma wave (SPW) excited over metallic surface irradiated by a laser beam, can undergo stimulated Compton scattering if phase velocity of daughter plasma wave is equal to the Fermi velocity for metal. The pump SPW parametrically excites a quasi-electrostatic plasma wave and a backscattered sideband SPW at resonance ω0 = ω-ω1 and. The growth rate of Compton process increases with the frequency of incident laser and turns out to be 5.425 × 10¹⁰ rad/s at laser frequency ω0 = 0.7595 × 10¹⁵ rad/s for incident laser amplitude A 0L = 11 × 10¹¹ V/m, laser spot size b = 1.38 × 10^-5 m, and free electron density of metal n 0 = 5.85 × 10²⁸/m³. The excitation of highly damped quasi-electrostatic plasma wave in this parametric process provide a better nonlinear option for surface heating as compared with direct laser heating. The process can also be used for diagnostics purposes.