Field-free molecular alignment control of filamentation

Field-free molecular alignment control of filamentation

With an approach of controlling the nonlinearity of medium rather than the light field, the effect of field-free molecular alignment on filamentation and resulting white-light generation is studied. This is done by measuring the rotational wavepacket evolution of nitrogen molecules after passing of a femtosecond laser pump pulse by observing the nonlinear propagation dynamics of a variably dela...

Field-Free Alignment and Strong Field Control of Molecular Rotors

Methods of controlling molecular rotations using linearly polarized femtosecond and picosecond pulses are considered and analyzed theoretically. These laser pulses, typically in the infrared, are highly non-resonant with respect to the electronic degrees of freedom of the molecules and have intensities of ∼ 10 to 10 W/cm. It is shown how these laser pulses can force small linear molecules to al...

Field-free three dimensional molecular axis alignment.

We investigate strategies for field-free three dimensional molecular axis alignment using strong nonresonant laser fields under experimentally realistic conditions. Using the polarizabilites and rotational constants of an asymmetric top rotor molecule (ethene, C2H4), we consider three different methods for axis alignment of a Boltzmann distribution of rotors at 4 K. Specifically, we compare the...

Phase-dependent field-free molecular alignment and orientation

Chaochao Qin,1,* Yuzhu Liu,2,3,† Xianzhou Zhang,1 and Thomas Gerber2 1Department of Physics, Henan Normal University, 453007 Xinxiang, People’s Republic of China 2Paul Scherrer Institute, 5232 Villigen, Switzerland 3College of Physics and Optoelectronic Engineering, Nanjing University of Information Science and Technology, 210044 Nanjing, P. R. China (Received 19 June 2014; published 24 Novembe...

Probing ultrafast thermalization with field-free molecular alignment