PHYSICS/BK21 Colloquium [5.19]

Controlling ultrafast processes in molecules
with intense two-color laser  pulses

 
  * Speaker :  Prof. Igor Litvinyuk
                     [Centre for Quantum Dynamics  and School of Biomolecular
                     and Physical Sciences Griffith University]

  * Place  : Physics Seminar Room (Science Bldg, 3-201)

  * Date & Time : May  19 (Wed)  3:00 ~ 4:00 pm

*Abstract

Combining the fundamental frequency of femtosecond laser pulses with its second harmonic (? + 2?) produces waveforms which lack spatial inversion symmetry in a way similar to few-cycle pulses with a stable carrier-envelope phase (CEP). Such
asymmetric laser pulses, as well as attosecond pulse trains (APTs) generated by
them, can be used for controlling various ultrafast processes in molecules. I will
present three examples of such control: (i) field-free orientation of heteronuclear
diatomic molecules; (ii) asymmetric dissociation of molecular hydrogen with (800 + 400) nm femtosecond pulses; and (iii) infrared-assisted asymmetric dissociation of molecular hydrogen with APTs produced by (? + 2?) pulses. I will also discuss the underlying mechanisms of such two-color control.

   Contact Person : Prof. Dong-Eon Kim ( 054-279-2089,  kimd@postech.ac.kr)