Intensity dependence narrowing of electromagnetically induced absorption in a Doppler-broadened medium

Dimitrijević, Jelena; Arsenović, D.; Jelenković, B. M.

doi:10.1103/physreva.76.013836

Cited by 21 publications

(18 citation statements)

References 32 publications

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“…Note that the earlier studies have reported the resonance width of up to 20 times smaller than the natural width for D 2 in 87 Rb, using a Laguerre−Gaussian coupling beam [25] and an appropriate beam intensity [24,25]. When all of our 'narrowing' techniques are implemented, the experimental method of ours can be used to build a robust and stable magnetometer using Zeeman sub-levels [26][27][28]. This can be carried out after our experimental setup is modified via addition of a quarter-wave plate placed in front of the cell, so that the ω 0 and ω + beams are orthogonal and circularly polarized (σ ± ).…”

Section: Resultsmentioning

confidence: 99%

Optimized acousto-optic modulation for the V-type electromagnetically induced transparency in rubidium-87 D1 line

Khalid¹,

Majeed²

2017

Ukr. J. Phys. Opt.

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Abstract. We present an experimental setup of optimized acousto-optic modulator designed for observing a V-type electromagnetically induced transparency resonance in the D 1 line of rubidium-87, with the full width at half maximum being equal to 2.7 MHz. Possible artefacts and undesirable influences on the signal resulting from this method are discussed in detail. The solutions to such technical challenges as beam steering and intensity fluctuations are found in optimization of optical setup. The reported method offers a number of advantages such a single external-cavity diode laser to create a bichromatic optical field outside the laser, whereby both the coupling and probe beams have identical properties. Moreover, the both beams are equally affected by environmental perturbations to the laser. Subsequently, the influence of mode hopping, beam-power fluctuation and frequency drift on the resonance can be eliminated. This negates a need in complicated and expensive temperature and current stabilizations, as well as in a locking unit. The simplicity and stability of the improved setup make our method suitable for many applications based upon electromagnetically induced transparency, especially those in the field of precision measurements.

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Section: Resultsmentioning

confidence: 99%

Optimized acousto-optic modulation for the V-type electromagnetically induced transparency in rubidium-87 D1 line

Khalid¹,

Majeed²

2017

Ukr. J. Phys. Opt.

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“…Higher efficiency of the light of elliptical polarization, vs. linearly polarized laser light, at higher laser intensities, can be explained by more efficient pumping to edged magnetic sublevels of the F g = 2. Calculations of the population of the Zeeman sublevels as a function of the laser intensity for linearly polarized light [8] and for elliptically polarized light (not shown) tell that the observed signal depends on the level of optical pumping of the Zeeman sublevels of the ground hyperfine state (orientation). We would like to point out that calculations also show that the observed behavior of the EIA is under strong influence of the Doppler broadening.…”

Section: Resultsmentioning

confidence: 99%

Effect of Laser Light Ellipticity on Hanle Electromagnetically Induced Absorption Amplitude and Line Width

et al. 2007

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Using the 2 S 1/2 Fg = 2 −→ 2 P 3/2 Fe = 3 transition in 87 Rb, we analyzed the interaction between the arbitrarily polarized laser light and Zeeman sublevels in the Hanle configuration. We studied theoretically and confirmed experimentally that the effect of the laser light polarization on the electromagnetically induced absorption strongly depends on the laser light power. For the same atomic transition, and for single laser light power (3 mW), it was recently shown that electromagnetically induced absorption line widths increase with polarization ellipticity and that electromagnetically induced absorption amplitude has maximum for certain laser light polarization different than linear. Here, we present results for amplitudes and widths of electromagnetically induced absorption for different laser light polarizations and for the laser light power ≤ 200 µW. It is verified that for small laser light power maximal electromagnetically induced absorption amplitude is for the linear polarization, whereas for larger power maximum of the electromagnetically induced absorption is at higher polarization ellipticity.

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“…The role played by transfer of coherence from the excited to the ground hyperfine state was also analyzed. Our previous work on phenomena of enhanced absorption includes the investigation of EIA amplitudes and linewidths as a function of different parameters, such as laser intensity, polarization and transverse magnetic fields [16]- [18].…”

Section: Introductionmentioning

confidence: 99%

Coherent processes in electromagnetically induced absorption: a steady and transient study

Dimitrijević¹,

Arsenović

Jelenković

2011

New J. Phys.

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Abstract. A perturbation method was used to solve optical Bloch equations (OBEs) for the transition F g = 1 → F e = 2, in order to describe the role of ground-level Zeeman coherences in the formation of electromagnetically induced absorption (EIA). A narrow Lorentzian peak, centered at zero value of the scanning magnetic field, appears in the analytical expression of the second-order correction of a density-matrix element for ground-level Zeeman coherences, (ρ g −1 ,g +1 ) x 2 . Through analytical expressions for lower-order corrections of density-matrix elements, we were able to establish clear relations between the narrow Lorentzian in (ρ g −1 ,g +1 ) x 2 and higher-order corrections of optical coherences, i.e. EIA. We see from analytical expressions that these two resonances have opposite signs and that EIA becomes electromagnetically induced transparency (EIT) in the limit of low efficiency of spontaneous transfer of coherences from excited-level to ground-level Zeeman sublevels. The transient behavior of EIA follows the time evolution of (ρ g −1 ,g +1 ) x 2 . After the coupling laser is turned on, both the Lorentzian peak in (ρ g −1 ,g +1 ) x 2 and EIA reach steady state via over-damped oscillations.

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Intensity dependence narrowing of electromagnetically induced absorption in a Doppler-broadened medium

Cited by 21 publications

References 32 publications

Optimized acousto-optic modulation for the V-type electromagnetically induced transparency in rubidium-87 D1 line

Optimized acousto-optic modulation for the V-type electromagnetically induced transparency in rubidium-87 D1 line

Effect of Laser Light Ellipticity on Hanle Electromagnetically Induced Absorption Amplitude and Line Width

Coherent processes in electromagnetically induced absorption: a steady and transient study

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