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A dark-line two-dimensional magneto-optical trap of 85Rb atoms with high optical depth
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View: Figures


Image of FIG. 1.
FIG. 1.

Schematics of the dark-line 2D MOT magneto-optical configuration. (a) is a 3D view. (b) and (c) are cross section views in x-y and y-z planes, respectively. (d) is the 85Rb D2 line energy level diagram with MOT laser transitions.

Image of FIG. 2.
FIG. 2.

Two alternative ways to produce a steady 2D MOT quadruple magnetic field: (a) A magnetic coil set with many turns, and (b) a permanent magnet set. The inset inside (b) shows the alignment of the 4 magnets in x-y plane.

Image of FIG. 3.
FIG. 3.

Fluorescence pictures of cold atoms in the 2D MOT viewed from (a) the x direction and (b) the y direction.

Image of FIG. 4.
FIG. 4.

EIT measurement scheme. (a) EIT atomic energy level diagram. (b) EIT measurement optical setup. (c) MOT and EIT measurement timing.

Image of FIG. 5.
FIG. 5.

The probe absorption spectrum profile at OD = 140 in (a) a two-level system (Ω c = 0) and (b) an EIT system (Ω c = 2π × 10.5 MHz). The circular points are experimental data, and the solid are theoretical curves plotted from Eq. (1).

Image of FIG. 6.
FIG. 6.

The measured OD as a function of the current of two dispensers in (1) the 2D MOT without the dark line, and the dark-line 2D MOT (2) without the depopular beam and (3) with the depopular beam. In these sets of measurements, we operate the 2D MOT with a trapping laser power of 80 mW and a repumping laser power of 18 mW.

Image of FIG. 7.
FIG. 7.

The measured OD as a function of the power of the trapping and repumping lasers in the dark-line 2D MOT. (a) OD vs trapping laser power when the repumping laser power is fixed at 18 mW. (b) OD vs repumping laser power when the trapping laser power is fixed at 40 mW.

Image of FIG. 8.
FIG. 8.

The measured OD in the dark-line 2D MOT (without the depopular beam) as a function of the duty cycle.


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Scitation: A dark-line two-dimensional magneto-optical trap of 85Rb atoms with high optical depth