2020/03/17 by Armen Sargsyan, Arevik Amiryan, Emmanuel Klinger +1
Chemistry · Physics and Astronomy · #Atomic and Subatomic Physics Research #Coupling (piping) #Dipole #Laser linewidth #Line (geometry) #Magnetic field #Magnetic moment #Quantum optics and atomic interactions #Resonance (particle physics) #Spectral line #Spectroscopy and Laser Applications #physics.atom-ph
paper · pdf · doi:10.1088/1361-6455/ab9f0a
15 pages, 8 figures
arxiv created 2020/03/17 · openalex created_date 2020/03/23 · openalex publication_date 2020/06/22 · arxiv updated 2020/08/26 · openalex updated_date 2026/08/06
Abstract In this paper we show that the second derivative (SD) technique of the absorption spectra of Rb atomic vapours, confined in a nanocell with a thickness ℓ = λ /2 = 398 nm, allows us to achieve close to Doppler-free spectroscopy. The narrow linewidth and linearity of the SD signal response with respect to transition probabilities allows us to study separately, in an external transverse magnetic field (0.6 to 4 kG), a large number of the atomic transitions of 85 Rb and 87 Rb atoms. Atomic transitions | F g , 0⟩ → | F e = F g , 0′⟩, for which the dipole moment is null in a zero magnetic field (so-called magnetically-induced transitions), show a gigantic increase in probability with an increasing magnetic field. When a magnetic field is applied to the vapour, we show the possibility of forming a dark resonance on these transitions by adding a coupling laser. We are therefore able to demonstrate a five-fold increase in the transmission of the probe radiation when the coupling laser is on. Theoretical calculations are in very good agreement with the experimental results.