Determination of the atomic density of rubidium-87

Abstract

Atomic density is a basic and important parameter in quantum optics, nonlinear optics, and precision measurement. In the past few decades, several methods have been used to measure atomic density, such as thermionic effect, optical absorption, and resonance fluorescence. The main error of these experiments stemmed from depopulation of the energy level, self-absorption, and the broad bandwidth of the laser. Here we demonstrate the atomic density of 87 Rb vapor in paraffin coated cell between 297 K and 334 K mainly using fluorescence measurement. Optical pumping, anti-relaxation coating, and absorption compensation approaches are used to decrease measurement error. These measurement methods are suitable for vapor temperature at dozens of degrees. The fitting function for the experimental data of 87 Rb atomic density is given.

High-performance Raman quantum memory with optimal control in room temperature atoms

“…The number of atoms varies with the temperature of the vapor cell. According to fluorescence measurement in experiment 41 , N ~ 2.58 × 10 10 at the cell temperature of 78.5 °C.…”

Spatial coherent manipulation of Bessel-like vector vortex beam in atomic vapor

“…In this experiment, the laser frequency is locked to the 5 2 S 1/2 , F = 2 → 5 2 P 1/2 , F = 1 transition of the 87 Rb D 1 line [52], the power of the input beam is 0.940 mW and beam waist is 3 mm. The pure 87 Rb cell is set at 67 • C with a temperature controller during the experiment which means the atomic density could achieve about 6 × 10 10 cm −3 [53]. Covering around the Rb cell is a three-layer µ-metal magnetic shield to isolate the cell from ambient magnetic fields.…”