[seminar] Dr. DANIEL COMPARAT (IF, 12.03, 15 sati)

[seminarIF]

Poštovani,

Obavještavamo Vas o održavanju seminara na Institutu za fiziku u četvrtak 12. ožujka 2009. u 15 sati (u zgradi Mladen Paić), koji će održati Dr. Daniel Comparat sa Laboratoire Aimé Cotton, CNRS, Université Paris-Sud, Orsay, France.
Sažetak predavanja nalazi se u nastavku poruke.



MOLECULAR VIBRATIONAL COOLING BY OPTICAL PUMPING
WITH SHAPED FEMTOSECOND PULSES
 
Daniel Comparat 

 Laboratoire Aimé Cotton, CNRS, Université Paris-Sud, Bât.505, 91405 Orsay, France.


As reported in Science [1] vibrational cooling of translationally cold Cs2 molecules into the lowest vibrational level v = 0 of the singlet X1Sg+ ground electronic state has been realized. Starting from a sample of cold molecules produced in a collection of vibrational levels of the ground state  [2], our method was based on repeated optical pumping by laser light with a spectrum broad enough to excite all populated vibrational levels but frequency-limited in such a way to eliminate transitions from v = 0 level, in which molecules accumulate. Here, we shall discuss how this method has been recently generalized to accumulate molecules into an arbitrary selected"target" vibrational level. It is implemented by using ultrashort pulse shaping techniques based on Liquid Crystal spatial light modulator. In particular a large fraction of the initially present molecule is transferred into a selected vibrational level such as v = 1, 2 and 7. Limitations of the method as well as the possible extension to rotational cooling will also be discussed.

 [1] Optical pumping and vibrational cooling of molecules 
M. Viteau, A. Chotia, M. Allegrini,N. Bouloufa, O. Dulieu, D. Comparat, P. Pillet 
Science 321 p. 232 - 234

[2] M. Viteau, A. Chotia, M. Allegrini, N. Bouloufa, O. Dulieu, D. Comparat, and P. Pillet. Efficient formation of deeply bound ultracold molecules probed by broadband detection. Phys. Rev. A , Accepted Mon Dec 29, 2008.



Srdačan pozdrav,

Voditelji seminara IF-a
(Ticijana Ban i Marko Kralj)


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