Figure 1: Experimental details.
From: Large Fizeau’s light-dragging effect in a moving electromagnetically induced transparent medium
(a) Level diagram of relevant atomic transitions for the experiment. (b) Experimental set-up: BS is a beam splitter. PBS is a polarizing beam splitter. AOM is an acoustic-optical modulator. We use a magnetic indexing mount to switch between pushing atoms upward and downward. In the pushing upward set-up, the push field is overlapped with the control field and coupled to a single mode fiber. In the push downward case, the push field is coupled backward to the control field fiber exiting port with 75% coupling efficiency to ensure the overlap of the control and push field. Detector 2 records the reference field for comparing the phase of the probe field from detector 1 on an oscilloscope. The local gravity g is pointing downward. The probe field frequency is ωp. The probe and control fields are aligned around 183°. (c) Timing sequence of the experiment. Magneto-optical trap (MOT) represents the timing sequence for cooling and repumping fields as well as the magnetic field for the preparation of the cold atomic ensemble. The push field is on at t=t1 and t=t2 for the determination of the velocity by imaging the position of the atomic cloud 1 and 3 ms after the push field.
