Isolated attosecond pulse from a solid target driven by two laser pulses

Isolated attosecond pulses provide unique opportunities for probing ultrafast electron dynamics in atoms and molecules, making them a powerful tool in ultrafast metrology due to their high temporal resolution. In this paper, we propose an all-optical control scheme to obtain an isolated attosecond pulse by employing two orthogonally polarized laser pulses interacting with a solid target. Specifically, a P-polarized relativistic laser pulse acts as a driving beam to excite target surface oscillation, while an S-polarized few-cycle laser pulse with lower intensity acts as a seed beam to be reflected by the target for harmonic generation. Particle-in-cell simulations show that an isolated 110-attosecond pulse can be produced by angularly selecting harmonics within a finite range, eliminating the need for carrier-envelope phase stabilization of the seed laser or additional harmonic spectral filtering. The proposed scheme offers a practical and efficient way to produce bright isolated attosecond pulses with current ultra-intense laser technology.