Title :
Demonstration of internal state laser cooling of molecular ions
Author :
Schneider, T. ; Roth, B. ; Hansen, M. ; Vasilyev, S. ; Ernsting, I. ; Bressel, U. ; Nevsky, A. ; Schiller, S.
Author_Institution :
Inst. fur Experimentalphys., Heinrich-Heine Univ. Dusseldorf, Dusseldorf, Germany
Abstract :
This study demonstrates an all-optical internal state cooling scheme for HD+ molecular ions in the rovibrational ground state using a 5.484 mum cw-quantum cascade laser. Resonance-enhanced multi-photon dissociation is used to selectively remove the ground-state HD+ ions from the trap. The efficiency of the pumping scheme is investigated by comparing the corresponding changes in fluorescence with and without an optical pumping phase preceding the detection. An increase in the relative fluorescence decay by a factor of 3 is observed with optical pumping.
Keywords :
fluorescence; ground states; hydrogen compounds; laser cooling; molecule-photon collisions; multiphoton processes; optical pumping; photodissociation; positive ions; resonant states; rotational-vibrational states; HD+; all-optical internal state cooling; cw-quantum cascade laser; internal state laser cooling; molecular ions; optical pumping; relative fluorescence decay; resonance-enhanced multiphoton dissociation; rovibrational ground state; wavelength 5.484 mum; Cooling; Fluorescence; Land surface temperature; Optical control; Optical pumping; Pump lasers; Quantum cascade lasers; Resonance; Spectroscopy; Stationary state;
Conference_Titel :
Lasers and Electro-Optics 2009 and the European Quantum Electronics Conference. CLEO Europe - EQEC 2009. European Conference on
Conference_Location :
Munich
Print_ISBN :
978-1-4244-4079-5
Electronic_ISBN :
978-1-4244-4080-1
DOI :
10.1109/CLEOE-EQEC.2009.5192358
