EIT resonance features in strong magnetic fields in rubidium atomic columns with length varying by 4 orders

Abstract

Electromagnetically induced transparency (EIT) resonances are investigated with the 85 Rb D 1 line (795 nm) in strong magnetic fields (up to 2 kG) with three different types of spectroscopic vapor cells: the nano-cell with a thickness along the direction of laser light L ≈ 795 nm, the micro-cell with L = 30 μm with the addition of a neon buffer gas, and the centimeter-long glass cell. These cells allowed us to observe systematic changes of the EIT spectra when the increasing magnetic field systematically decoupled the total atomic electron and nuclear angular moments (the Paschen-Back/Back-Goudsmit effects). The observations agree well with a theoretical model. The advantages and disadvantages of a particular type of cell are discussed along with the possible practical applications.

Dark resonance formation with magnetically induced transitions: extension of spectral range and giant circular dichroism

“…It is important to mention that when exploiting only "allowed" transitions of a Λ-system for formation of the dark resonance, the DR intensity decreases practically down to zero for B > 1000 G [17], while the DR formed with the MI transition labeled 3 remains detectable even for B = 3000 G. We should note that DR formation in strong magnetic fields is possible by implementing a ladder-system transitions [18,19], however, in this case the key parameters (contrast and linewidth) are much worse than in the case of a Λ-system. Now let us consider the results for the case when the MI transition 2 → 0 ′ (∆F = −2, marked as 1' ) is used to form the DR (the probability of this MI versus magnetic field when using σ − radiation is shown in Fig.…”

Forty years after the first dark resonance experiment: an overview of the COSMA project results

“…The electromagnetically induced transparency (EIT) phenomenon has been investigated in a Λ-system of the 87 Rb D1 line in an external transverse magnetic field 24 25 . These cells allowed us to observe systematic changes of the EIT spectra when the increasing magnetic field systematically decoupled the total atomic electron and nuclear angular moments (the Paschen-Back/Back-Goudsmit effects).…”