Nonsequential double ionization of atoms driven by spatially inhomogeneous laser fields

Using a three-dimensional classical ensemble method, we investigated the nonsequential double ionization (NSDI) of xenon atoms from near infrared to mid-infrared in spatially inhomogeneous laser fields, and compared with results homogeneous fields. The show that NSDI probability curves are similar between field at short wavelength. With wavelength increasing, high intensities is more suppressed for field. Compared final emission angle two electrons exhibits much stronger correlated characteristic especially longer wavelengths, almost all concentrated around 0° meaning always emitted into same direction parallelly. Moreover, effective recollision dominated by first return electron however, transition dominance second occurs Further, reveal details ultrafast dynamics fields back-tracing trajectories NSDI.