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The schematic of the experimental setup.
The schematic of the frequency detuning of various lasers used in the experiments with respect to the hyperfine atomic transitions of 87Rb atom. Both the transitions (5S1/2 F = 2) → (5P3/2 F′ = 3) and (5S1/2 F = 1) → (5P3/2 F′ = 2) have the natural line-width of ∼6 MHz.
(A) Measured variation in number of atoms in UHV-MOT (capture speed vc = 20.2 m/s) with push beam spot-size for different powers in push beam; (a) 15 mW, (b) 20 mW, and (c) 25 mW. (B) Measured variation after modifying the vc for UHV-MOT to 18.4 m/s (curve (e)), for a push beam power of 20 mW. For comparison, the data of curve (b) in (A) with higher vc value (=20.2 m/s) is replotted as curve (d) in (B).
Calculated variation in speed of an atom ejected from the VC-MOT with push beam spot-size for different values of push beam power. The continuous horizontal line shows the estimated capture speed of UHV-MOT (vc = 20.2 m/s).
The calculated variation in the peak dipole potential of push beam with distance from VC-MOT along propagation direction, for the push beam spot-size of 200 μm at the VC-MOT position. Different curves show the potential for 87Rb atoms in different hyperfine states at different push beam powers. The arrow indicates the position of UHV-MOT where atoms are pumped to (5S1/2 F = 2) state due to presence of the UHV-MOT re-pumping beam.
Measured variation in number of atoms in UHV-MOT with time, for different values of push beam spot-size at the VC-MOT; (a) spot-size 146 μm (power 15 mW) and (b) spot-size 172 μm (power 20 mW). The continuous curves are for guiding eye to the measured data.
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