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The transition dipole moments (TDMs) of ultracold85Rb133Cs molecules between the lowest vibrational ground level, X1Σ+ (v = 0, J = 1), and the two excited rovibrational levels, 23Π0+ (v′ = 10, J′ = 2) and 21Π1 (v′ = 22, J′ = 2), are measured using depletion spectroscopy. The ground-state85Rb133Cs molecules are formed from cold mixed component atoms via the 23Π0− (v = 11, J = 0) short-range level, then detected by time-of-flight mass spectrum. A home-made external-cavity diode laser is used as the depletion laser to couple the ground level and the two excited levels. Based on the depletion spectroscopy, the corresponding TDMs are then derived to be 3.5(2)×10−3ea0and 1.6(1)×10−2ea0, respectively, where ea0represents the atomic unit of electric dipole moment. The enhance of TDM with nearly a factor of 5 for the 21Π1 (v′ = 22, J′ = 2) excited level means that it has stronger coupling with the ground level. It is meaningful to find more levels with much more strong coupling strength by the represented depletion spectroscopy to realize direct stimulated Raman adiabatic passage transfer from scattering atomic states to deeply molecular states. [ABSTRACT FROM AUTHOR]

We demonstrate a fiber Fabry–Pérot cavity in the ultraviolet range, which covers the florescence wavelength for the 2P1/2 to 2S1/2 transition of Yb+ and is designed in the bad cavity limit for florescence collection. Benefiting from both the small cavity mode volume and the large atom dipole, a cavity with moderate finesse and high transmission still supports a good cooperativity, which is made and tested in experiment. Based on the measured experimental parameters, simulation performed on the cavity and ion shows a Purcell factor better than 2.5 and a single-mode fiber collection efficiency over 10%. This technology can support ultra-bright single photon sources based on trapped ions and can provide the possibility to link remote atoms as a quantum network. [ABSTRACT FROM AUTHOR]