Spectroscopy in an Extremely Thin Vapour Cell: Comparing the Cell Length Dependence in Fluorescence and in Absorption Techniques,

David Sarkisyan (1) , Tigran Varzhapetyan (1) , Asphet Sarkisyan (1) , Yuri Malakyan (1) , Aram V. Papoyan (1) , Arturo Lezama (2) , Daniel Bloch (3) , Martial Ducloy (3)

1 IPR - Institute for Physical Research
2 Instituto de Fisica, Facultad de Ingenieria,
3 LPL - Laboratoire de Physique des Lasers

We compare the behaviour of absorption and of resonance fluorescence spectra in an extremely thin Rb vapour cell as a function of the ratio of L/ l , with L the cell thickness (L ~ 150-1800 nm) and l the wavelength of the Rb D2 line (780 nm). The Dicke-type coherent narrowing [G. Dutier et al., Europhys. Lett, 63, 35 (2003)] is observed only in transmission measurements, in the linear regime, with its typical collapse and revival, which reaches a maximum for L= (2n +1) l/2 (n integer). It is shown not to appear in fluorescence, whose behaviour –amplitude, and width- is more monotonic with L. Conversely, at high-intensity, the sub-Doppler saturation effects are shown to be the most visible in transmission around L = nl.

Domaines: Physique Atomique [physics.atom-ph]

David Sarkisyan, Tigran Varzhapetyan, Asphet Sarkisyan, Yuri Malakyan, Aram V. Papoyan, et al.. Spectroscopy in an Extremely Thin Vapour Cell: Comparing the Cell Length Dependence in Fluorescence and in Absorption Techniques,. Physical Review A : Atomic, molecular, and optical physics [1990-2015], 2004, 69, pp.065802. ⟨10.1103/PhysRevA.69.065802⟩. ⟨hal-00004404⟩