2015/09/23 by C. R. McDonald, Chris McDonald, G. Vampa +4 · 1 citation
Physics and Astronomy · #Laser-Matter Interactions and Applications #Advanced Fiber Laser Technologies #Spectroscopy and Quantum Chemical Studies
paper · pdf · doi:10.1103/physreva.92.033845
High harmonic generation in semiconductors is analyzed for high mid-infrared laser intensities for which the electron-hole pair is driven beyond the first Brillouin zone and exhibits Bloch oscillations. We find that even a two-band analysis exhibits second and higher plateaus. Whereas the first plateau is shown to be consistent with high harmonic generation through electron-hole recollision, the higher plateaus arise from dynamic Bloch oscillations; however, the driving process is interband in nature, in contrast to the generally accepted intraband Bloch oscillation mechanism. Energy conservation is fulfilled, as harmonics beyond the first plateau come from a cascaded nonlinearity.