Observation of Doppler-free electromagnetically induced transparency in atoms selected optically with specific velocity

Yu, Hoon; Kim, Kwan Su; Kim, Jung Dong; Lee, Hyun Kyung; Kim, Jung Bog

doi:10.1103/physreva.84.052511

Cited by 7 publications

(4 citation statements)

References 26 publications

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“…Moving the crossover peak position away enhances the signal sensitivity [17]. It is also worthy to note that VSPS gives us a signal similar to a cold atom [21].…”

Section: Nakayama Theory For Velocity Selective Birefringence Modelmentioning

confidence: 93%

Velocity Selective Polarization Spectroscopy for Modulation-Free Dispersion Signals at Detuned Frequencies

Yu¹,

Kim²,

Kim

2014

Journal of Spectroscopy

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We present a simple technique to obtain modulation-free locking signals at the detuned frequency from an atom transition between hyperfine structures. Polarization spectroscopy allows us to obtain the dispersion signals that are suitable for frequency locking. Velocity selective optical pumping using another laser beam also allows us to obtain signals at the detuned frequency and to shift crossover signal away. By combining these two techniques, we were able to obtain the velocity selective birefringence signal only at the principle transition in an Rb vapor cell and compare the birefringence signal with the theoretical spectrum predicted by using Nakayama’s model.

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“…Moving the crossover peak position away enhances the signal sensitivity [17]. It is also worthy to note that VSPS gives us a signal similar to a cold atom [21].…”

Section: Nakayama Theory For Velocity Selective Birefringence Modelmentioning

confidence: 93%

Velocity Selective Polarization Spectroscopy for Modulation-Free Dispersion Signals at Detuned Frequencies

Yu¹,

Kim²,

Kim

2014

Journal of Spectroscopy

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“…By analyzing the formation of crossover peaks, it is found that they can be used to select atoms with different velocities. [26][27][28] Taking the three-level system shown in Fig. 1(b) as an example, the group of atoms with velocity V = ±c(ν 1 − ν 2 )/(ν 1 + ν 2 ) in the direction of the incident laser beam can resonate with both the pump beam and the probe beam at the frequency…”

Section: Theoretical Methodsmentioning

confidence: 99%

In situ temperature measurement of vapor based on atomic speed selection

Yu¹,

Li²,

Yue³

et al. 2023

Chinese Phys. B

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We demonstrate an experimental method for the in situ temperature measurement of atomic vapor using saturated absorption spectrum. By separately manipulating the frequency of pump beam and probe beam, the position of crossover peaks can move along the spectrum. Different velocity classes of atoms contribute to the crossover during the movement. We study the relationship between the intensity change of peaks and vapor temperature. Our experimental result around room temperature shows a deviation of less than 0.3 K. Compared with traditional thermometry using absorption spectroscopy, higher accuracy can theoretically be achieved for real-time thermometry.

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“…The main advantages of using the five-level Λ−Ξ scheme are as follows. Firstly, it gives rise to multiwindow EIT that has potential applications like the optical nanofiber for guiding entangled beams [42], the influence of an external magnetic field [43] and velocity selection [44,45]. Secondly, under the condition of subluminal light propagation, enhanced Kerr nonlinearity with reduced absorption can be obtained near the line center for both the stationary and moving atom case.…”

Section: Introductionmentioning

confidence: 99%

Achieving colossal Kerr nonlinearity via multiphoton atomic coherence in a five-level Λ − Ξ system

2019

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We propose to utilize a five-level Λ−Ξ system to achieve large self-Kerr nonlinearity under multiphoton resonance conditions. Using a density matrix formulation along with an iterative perturbation technique, analytic expressions of linear and nonlinear susceptibilities are derived for stationary as well as for moving atoms. Variation of firstand third-order susceptibilities with respect to frequency and intensity of switching field is then discussed. The dressed-state picture is employed to explain the amplitude and position of each peak in linear and nonlinear absorption profiles. It is found that under slow light conditions, large controllable Kerr nonlinearity with reduced linear and nonlinear absorption is achieved by properly adjusting the strength and detunings of strong electromagnetic (e.m.) fields. Our numerical results also reveal that the Kerr nonlinear index of our considered system is greater than that of existing three-level Λ and four-level N systems. Finally, it is substantiated that self-Kerr nonlinearity is proliferated by taking the Doppler effect into account.

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Observation of Doppler-free electromagnetically induced transparency in atoms selected optically with specific velocity

Cited by 7 publications

References 26 publications

Velocity Selective Polarization Spectroscopy for Modulation-Free Dispersion Signals at Detuned Frequencies

Velocity Selective Polarization Spectroscopy for Modulation-Free Dispersion Signals at Detuned Frequencies

In situ temperature measurement of vapor based on atomic speed selection

Achieving colossal Kerr nonlinearity via multiphoton atomic coherence in a five-level Λ − Ξ system

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