Force-assisted velocity selective coherent population trapping

We present a fully quantum analysis of velocity selective coherent population trapping (VSCPT) in two schemes for which there is a force which assists in the accumulation of atoms in the trapping state. In the first scheme, the Fg=2 to Fe=2 transition was studied where the existence of a semiclassical polarization gradient force even for a pure sigma +- sigma - configuration has been demonstrated which gives cooling for blue detuning. We also verify that cooling may be obtained for the F=2 to 1 and F=3 to 2 transitions; our fully quantum mechanical calculations yield a result which is consistent with recent experimental results of Valentin et al. (1992) but differ from previous semiclassical calculations. Secondly, we discuss a scheme of force-assisted VSCPT which combines VSCPT on the Fg=1 to Fe=1 transition with the coupling to another transition for which a strong sub-Doppler cooling force is present. This scheme allows velocity selective coherent population trapping and the polarization-gradient force to work under optimum conditions simultaneously. We find that both of these two schemes lead to efficient cooling of atoms.

[1]  C. Foot,et al.  Quantum jump calculations of velocity-selective coherent population trapping in one and two dimensions , 1995 .

[2]  C. Foot,et al.  Optical elements for interferometry of atoms with J > 1 , 1994 .

[3]  C. Foot,et al.  Velocity distribution for laser cooled atoms in a one-dimensional sigma +- sigma - configuration , 1994 .

[4]  Shimizu,et al.  Two-dimensional subrecoil laser cooling. , 1994, Physical review letters.

[5]  A. Hemmerich,et al.  A NOVEL SCHEME FOR EFFICIENT COOLING BELOW THE PHOTON RECOIL LIMIT , 1994 .

[6]  Shahriar,et al.  Polarization-gradient-assisted subrecoil cooling: Quantum calculations in one dimension. , 1994, Physical review. A, Atomic, molecular, and optical physics.

[7]  Bouchaud,et al.  Subrecoil laser cooling and Lévy flights. , 1994, Physical review letters.

[8]  Cai,et al.  Continuous polarization-gradient precooling-assisted velocity-selective coherent population trapping. , 1993, Physical review. A, Atomic, molecular, and optical physics.

[9]  Pritchard,et al.  High densities of cold atoms in a dark spontaneous-force optical trap. , 1993, Physical review letters.

[10]  C. Foot,et al.  Polarization gradient cooling in a one-dimensional sigma +- sigma - configuration for any atomic transition , 1992 .

[11]  E. Arimondo,et al.  Transient velocity-selective coherent population trapping in one dimension , 1992 .

[12]  P. Pillet,et al.  One-Dimension Sub-Doppler Molasses in the Presence of Static Magnetic Field , 1992 .

[13]  E. Arimondo,et al.  Coherent Trapping Subrecoil Cooling in Two Dimensions Aided by a Force , 1991 .

[14]  Chu,et al.  Atomic interferometry using stimulated Raman transitions. , 1991, Physical review letters.

[15]  Nienhuis,et al.  Operator description of laser cooling below the Doppler limit. , 1991, Physical review. A, Atomic, molecular, and optical physics.

[16]  Berman Pr.  Nonlinear spectroscopy and laser cooling. , 1991 .

[17]  Alain Aspect,et al.  Laser cooling below the one-photon recoil energy by velocity-selective coherent population trapping: theoretical analysis , 1989 .

[18]  J. Dalibard,et al.  Limit of Doppler cooling , 1989 .

[19]  C. cohen-tannoudji,et al.  Laser cooling below the Doppler limit by polarization gradients: simple theoretical models , 1989 .

[20]  C. cohen-tannoudji,et al.  Laser cooling below the one-photon recoil by velocity-selective coherent population trapping. , 1988, Physical review letters.

[21]  B. Shore,et al.  Coherent atomic deflection by resonant standing waves , 1981 .