Circular phase mask for control and stabilization of single optical filaments.
We experimentally demonstrate an efficient way to control and stabilize single optical filaments initiated by ultrashort laser pulses in a rare gas medium. This is done by the application of a stationary two-dimensional phase mask to the laser beam prior to focusing. Simple circular phase-step patterns of a given radius and relative phase are sufficient to stabilize the pointing of the filament output and to optimize the spectral bandwidth of the light without any resulting loss of input laser power.
Pfeifer
Thomas
T
Department of Chemistry, University of California, Berkeley, California 94720, USA. tpfeifer@lbl.gov
Gallmann
Lukas
L
Abel
Mark J
MJ
Neumark
Daniel M
DM
Leone
Stephen R
SR