Sub-Doppler and subnatural narrowing of an absorption line induced by interacting dark resonances in a tripod system

Goren, C.; Wilson-Gordon, A. D.; Rosenbluh, M.; Friedmann, H.

doi:10.1103/physreva.69.063802

Cited by 79 publications

(36 citation statements)

References 31 publications

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“…7,14,15 EIA has also been predicted for a three-level Λ system interacting with a standing wave, 16 and for a nearly degenerate tripod system interacting with a σ polarized pump and a π polarized probe. 17 The simplest system that can be used to model EIA due to TOC is the N system. 11,12,18 In this scheme, which is shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

<title>Pump-probe spectroscopy in degenerate two-level atoms with arbitrarily strong fields</title>

et al. 2007

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We review our previous work on pump-probe spectroscopy in realistic degenerate two-level systems and model systems. In particular, we discuss the role of transfer of coherence (TOC) between the ground and excited hyperfine states in producing electromagnetically-induced transparency (EIA) peaks in the probe spectrum, when an F g → F e = F g + 1 transition in an alkali-metal atom interacts with a strong pump and weak probe that have perpendicular polarizations. When the pump is σ + polarized and the probe π polarized, this system can be modelled by an N system. We also discuss the role of transfer of population (TOP) between the Zeeman levels of the ground hyperfine state in producing EIA peaks when the pump and probe have the same polarization. This system can be modelled using a double two-level system. The role of Doppler broadening and phase-changing collisions in modifying the EIA-TOC and EIA-TOP absorption and refraction spectra is also discussed. All these spectra were calculated using MATLAB programs that both construct and solve the relevant Bloch equations. In our recent work, we consider the effect of a strong probe on the pump absorption and refraction spectra when the pump and probe polarizations are linear and perpendicular. It is difficult to solve this problem numerically due to the large number frequencies involved. In order to simplify the problem, we considered two cases: (i) σ + polarized pump and π polarized probe, and (ii) σ + polarized pump and σ − polarized probe, and investigated a series of transitions in both Rb and Cs, using modified versions of the MATLAB programs devised for the weakprobe case. A number of interesting differences from the weak-probe case were found. For example, when the probe is sufficiently strong, we found the pump and probe spectra to show complementary behavior. In addition, as the number of Zeeman levels increase, the EIA peaks become progressively sharper, and are accompanied by steeper dispersion.

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Section: Introductionmentioning

confidence: 99%

<title>Pump-probe spectroscopy in degenerate two-level atoms with arbitrarily strong fields</title>

et al. 2007

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“…In our case, the components of the coupling beam lead to opposite Rabi frequencies for the | 〉 ↔ | 〉 and | 〉 ↔ | 〉 transitions. As a result, there is a destructive interference between two EIT peaks at the center and we observe a sharp absorption dip, looking like (but different in nature from) EIA 23 , flanked by two EIT (detuned) peak 21 . It is clear from Figure 5 that for fixed magnetic fields, the widths and heights of all the EIT windows increase while the absorption dip decreases with increasing coupling power.…”

Section: Introductionmentioning

confidence: 94%

“…In this case, two dark resonance peaks appear and they shift from the zero detuning position with increasing magnetic field. The double dark resonance cannot be explained in terms of transfer of coherence (TOC) from the excited level to the ground level 21,22 but these dark resonances are two EIT peaks at = Δ Z . For different coupling powers at a given magnetic field, these two peaks interfere with each other 5 .…”

Section: Introductionmentioning

confidence: 98%

Interacting double dark resonances in a tripod system of room-temperature⁴He

et al. 2010

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We experimentally study two different tripod configurations using metastable 4 He, with the probe perpendicular and parallel to the quantization axis, defined by an applied weak magnetic field. In the first case, the two dark resonances interact incoherently and merge together into a single transparency peak with increasing coupling power. In the second case, we observe destructively interfering double dark resonances leading to a narrow absorption dip at the line center. We confirm the results theoretically.

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“…1, driven by two pumps and a probe, has recently been shown to possess two electromagnetically induced transparency (EIT) windows separated by narrow range of frequencies [1,2]. In between these two EIT peaks the absorption is high, thus corresponding to a sharp absorption resonance, as shown in Fig 2. When the two EIT regions are sufficiently close to each other, the narrow absorption peak was shown to have sub-Doppler and subnatural linewidth [3]. The calculations predicted that the central absorption peak narrows with pump intensity.…”

Section: Introduction and Theorymentioning

confidence: 96%