Reconstruction of few-fs XUV pulses with a perturbative approach

Compression methods for XUV attosecond pulses.

Attosecond extreme-ultraviolet (XUV) pulses generated in gases via high-order harmonic generation typically carry an intrinsic positive chirp. Compression of such pulses has been demonstrated using metallic transmission filters, a method with very limited tunability. We compare here the compression achievable with a diffraction grating based method with that of metallic filters using simulated ...

Noncollinear wave mixing of attosecond XUV and few-cycle optical laser pulses in gas-phase atoms: Toward multidimensional spectroscopy involving XUV excitations

Wei Cao,1,2,3 Erika R. Warrick,1,2 Ashley Fidler,1,2 Daniel M. Neumark,1,2 and Stephen R. Leone1,2,3 1Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA 2Department of Chemistry, University of California, Berkeley, California 94720, USA 3Department of Physics, University of California, Berkeley, California 94720, USA (Received 20 September 2016; p...

Controlling H- detachment with few-cycle pulses

Time-Dependent B-Spline R-Matrix Approach to Double Ionization of Atoms by XUV Laser Pulses

We present an ab initio and non-perturbative time-dependent approach to the problem of double ionization of a general atom driven by intense XUV laser pulses. After using a highly flexible B-Spline R-matrix method to generate field-free Hamiltonian and electric dipole matrices, the initial state is propagated in time using an efficient ArnoldiLanczos scheme. Test calculations for double ionizat...

Tissue ablation with 100-fs and 200-ps laser pulses

We used water and human skin tissue to compare the surgical potential of 100-fs and 200-ps laser pulses. For investigation of threshold behavior of 100-fs and 200-ps pulses, we use water as a model for tissue. In addition to having a lower threshold, we find that energy deposition is much more consistent with 100-fs pulses. We also compared 100-fs and 200-ps laser pulse effects on the surface a...