2020
DOI: 10.1088/1361-6455/ab7fc2
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Combined effect of non-linear optical and collisional processes on absorption saturation in a dense rubidium vapour

Abstract: We study non-linear absorption of intense monochromatic light through a dense natural rubidium (Rb) vapour. We measure transmission through a 10 cm long heated vapour cell for atom densities up to 3 × 1019 m−3 and saturation parameters up to 104, for linear and circular polarisation, close to resonance on the 87Rb D2 F = 1 → F′ = 0, 1, 2 transition. The strong absorption at low intensity is frustrated by an interplay of optical non-linearities (saturation and optical pumping) and non-linear e… Show more

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Cited by 8 publications
(4 citation statements)
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“…Given these parameters and the precise data of the anomalous dispersion of the vapor [24], the schlieren signal s(y) can also be calculated theoretically using standard formulas of Fourier optics [23] for any given plasma density distribution N p (y, z). (Note however, that at the vapor densities considered, the homogeneous lineshape function in [24] must be augmented by a collision broadening term [25], the magnitude of which contains a constant known experimentally to much lower accuracy than the spontaneous decay rate.) To obtain information on the extent of the plasma column from s(y), we start by assuming some sensible profile for the plasma density and calculating the theoretical schlieren signal.…”
Section: Inferring Plasma Column Propertiesmentioning
confidence: 99%
“…Given these parameters and the precise data of the anomalous dispersion of the vapor [24], the schlieren signal s(y) can also be calculated theoretically using standard formulas of Fourier optics [23] for any given plasma density distribution N p (y, z). (Note however, that at the vapor densities considered, the homogeneous lineshape function in [24] must be augmented by a collision broadening term [25], the magnitude of which contains a constant known experimentally to much lower accuracy than the spontaneous decay rate.) To obtain information on the extent of the plasma column from s(y), we start by assuming some sensible profile for the plasma density and calculating the theoretical schlieren signal.…”
Section: Inferring Plasma Column Propertiesmentioning
confidence: 99%
“…The precise refractive index and absorption parameter for the probe beam wavelength can be obtained from the composite lineshape function using the material parameters of the rubidium D 2 line [32]. (Note that the vapor densities used here require that we augment the description of [32] with a pressure broadening term in the homogeneous lineshape [33].) The integrated phaseshift of the probe beam and the overall attenuation can then be computed, and the transit across the 4f system with the mask can be calculated using the standard formulas for Fourier optics [31].…”
Section: B Obtaining Plasma Parametersmentioning
confidence: 99%
“…Here we summarise only the main points relevant for this experiment. We begin by assuming an atom-light system operating in the weak-probe regime [61,62], although recent work [46] provides methods to generalise this into a strong-probe regime. The model used here is based on the complex electric susceptibility, χ(∆), of the atomic medium as a function of the optical frequency detuning h∆ = (hω laser − hω 0 ) in the vicinity of the alkali D-lines, where ω laser is the angular frequency of the laser and ω 0 is the angular frequency of the atomic transition.…”
Section: Theoretical Modelmentioning
confidence: 99%
“…Work has previously been done in atomic vapours of both low and high atomic densities [44][45][46], and other relevant magneto-optic effects have been the subject of extensive studies [47][48][49][50]. This atom-light interaction whilst in the presence of an external magnetic field has also been used in other systems such as [21,[51][52][53].…”
Section: Introductionmentioning
confidence: 99%