The Probe Transmission Spectra of ⁸⁷ Rb in an Operating Magneto-Optical Trap in the Presence of an Ionizing Laser

Abstract

The influence of an ionizing laser on the pump-probe spectra of 87 Rb over the transition 5 2 𝑆 1/2 , 𝐹 = 2 → 5 2 𝑃 3/2 , 𝐹 ′ = 3 is experimentally studied in an operating magneto-optical trap. These spectral features, including gain peak, a dispersion-like structure and absorption peak, become weak as the intensity of the ionizing laser increases. Moreover, the profiles of the absorption peak and gain peak vary as the ionizing laser intensity changes. Such results indicate that there is more than one component in the two features and that each component has different dependences on the number of 87 Rb atoms.

Analytical solutions for a doubly driven two-level atom

“…Details of the apparatus were described in our previous work. [14][15][16] Thus, the 5 2 S 1/2 , F = 2 and 5 2 P 3/2 , F = 3 states of 87 Rb atoms as well as the cooling/trapping beams and an additional coupling field constitute the degenerate two-level atomic system in two strong monochromatic coupling fields. The cooling/trapping beams play the role of the first coupling field which acts on the bare atomic levels, and the second coupling field acting on the dressed levels is provided by an independent frequencystabilized diode laser of Toptica DL100.…”