Harmonic Spectra Bandwidth Broadening With A New Polarization Gating

A new polarization gating is demonstrated by our principle-of-proof experiment, which is theoretically proposed to generate the isolated or double attosecond pulses with the multi-cycle driving laser pulse in the previous work [Optics Express. 20, 5196 (2012)]. In the experiment, the polarization gating is formed by two orthogonally-polarized linearly chirped multi-cycle laser pulses, and the spectral bandwidths of the harmonics are broadened by more than two times, which agree with the previous theoretical work.