Demonstration of high harmonic plateau supercontinuum driven by a 6.5 fs/800 nm laser field

Isolated attosecond pulses in the plateau region have been demonstrated by using nearly single-cycle laser pulses. However, so far the single-cycle laser pulses is not available for most of the laboratories. Recently, several methods have been put forward for generating isolated attosecond pulses using longer laser pulses. In our work, we demonstrate experimentally the high harmonic plateau supercontimuum driven by a 6.5 fs, 800 nm phase-stabilized laser pulse due to the successful selection of single quantum path of the returning electrons. The high harmonic generation is controlled on the basis of the big difference of ionization between the adjacent half optical cycle of ultrashort driving laser pulses. Moreover, we predict the possibility to generate isolated 100 as pulses using a driving laser pulse longer than 2 cycles.