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Abstract: Optical Feshbach resonances Phys.
Rev.
Lett.
94, 193001 2005 andpump-dump photoassociation with short laser pulses Phys.
Rev.
A 73, 0334082006 have been proposed as means to coherently form stable ultracold alkalidimer molecules.
In an optical Feshbach resonance, the intensity and possiblyfrequency of a cw laser are ramped up linearly followed by a sudden switch-offof the laser.
This is applicable to tightly trapped atom pairs.
In short-pulsephotoassociation, the pump pulse forms a wave-packet in an electronicallyexcited state.
The ensuing dynamics carry the wave-packet to shorterinternuclear distances where, after half a vibrational period, it can bedeexcited to the electronic ground state by the dump pulse.
Short-pulsephotoassociation is suited for both shallow and tight traps.
The applicabilityof these two means to produce ultracold molecules is investigated here for$^{88}$Sr.
Dipole-allowed transitions proceeding via the $B^1\Sigma u^+$excited state as well as transitions near the intercombination line arestudied.



Autor: Christiane P.
Koch


Fuente: https://arxiv.org/



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