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Chinese Physics Letters

Observation of Electromagnetically Induced Transparency by a Train of Short Pulses

叶存云

Published Jan 1, 2004• 0 citations
OpenAlex

Abstract

We report the experimental demonstration of electromagnetically induced transparency in hot rubidium (^85Rb) atomic vapour by using an actively mode-locked external cavity diode laser in Littman-Metcalf configuration. We can make opaque resonant transitions transparent to any two optical comb components in the pulse trains which excite atomic coherence in the ground states of ^85Rb.

Related papers

Observation of Electromagnetically Induced Transparency by a Train of Short Pulses

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We report the experimental demonstration of electromagnetically induced transparency in hot rubidium ( 85 Rb) atomic vapour by using an actively mode-locked external cavity diode laser in Littman–Metcalf configuration. We can make opaque resonant transitions transparent to any two optical comb components in the pulse trains which excite atomic coherence in the ground states of 85 Rb.

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Coherent laser spectroscopy of rubidium atoms

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Laser spectroscopy experiments are reported on rubidium atoms by using two or three external cavity diode lasers to study multiple resonance transitions in Λ- and V-type systems as well as on (Λ+V)-type system. Electromagnetically induced transparency (EIT) peaks having sub-natural line-widths are found on the Doppler broadened transmission backgrounds with velocity selective enhanced absorption dips. In the presence of a pump laser, probe spectrum shows enhancement of EIT signal by tuning the control laser frequency when the Λ- and V-type EIT signals are made to overlap. Theoretical analysis is carried out by solving the optical Bloch equations for five-level atomic model under Λ configuration. With the numerically simulated spectra, variation of EIT transmission peak with ground state decay rate and excited state spontaneous decay rate are investigated. Effect of pump Rabi frequency on the transmission peak is also shown.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Oct 8, 2010•1 citation

Observation of Electromagnetically Induced Transparency

Ataç İmamoğlu, Klaus J. Boller, Stephen E. Harris

We report the results of an experiment showing how an opaque atomic transition in neutral Sr may be rendered transparent to radiation at its resonance frequency. This is accomplished by applying an electromagnetic coupling field (Fig. 1) between the upper state 4d5d1D2 of the transition and another state 4d5p 1D2 of the atom. When the Rabi frequency of the coupling field exceeds the inhomogeneous width of the 5s5p1P1−4d5d1D2 transition, the medium becomes transparent on line center. In this work, we have changed the transmittance of neutral strontium from exp(−20) without a coupling laser to exp(−1) in the presence of a coupling laser, over a spectral range of 6 GHz (Fig. 2). The coupling laser that we have used is a single mode Littman dye laser with an intensity of 10 MW/ cm2 .

Short Wavelength Coherent Radiation: Generation and Applications•Jan 1, 1991•56 citations
We report the experimental demonstration of electromagnetically induced transparency in hot rubidium (^85Rb) atomic vapour by using an actively mode-locked external cavity diode laser in Littman-Metcalf configuration. We can make opaque resonant transitions transparent to any two optical comb components in the pulse trains which excite atomic coherence in the ground states of ^85Rb.
It was shown by Kocharovskaya and Khanin [Sov. Phys. JETP 63, 945 (1986)] that a comb of optical pulses can induce a ground-state atomic coherence and change the optical response of an atomic medium. In our experiment, we studied the propagation of a comb of optical pulses produced by a mode-locked diode laser in rubidium atomic vapor. Electromagnetically induced transparency (EIT) was observed when the pulse repetition rate is a subharmonic of the hyperfine splitting of the ground state. The width of the EIT resonance is determined by the relaxation rate of the ground-state coherence. Possible applications to magnetometery, atomic clocks, and frequency chains are discussed.
Laser spectroscopy experiments are reported on rubidium atoms by using two or three external cavity diode lasers to study multiple resonance transitions in Λ- and V-type systems as well as on (Λ+V)-type system. Electromagnetically induced transparency (EIT) peaks having sub-natural line-widths are found on the Doppler broadened transmission backgrounds with velocity selective enhanced absorption dips. In the presence of a pump laser, probe spectrum shows enhancement of EIT signal by tuning the control laser frequency when the Λ- and V-type EIT signals are made to overlap. Theoretical analysis is carried out by solving the optical Bloch equations for five-level atomic model under Λ configuration. With the numerically simulated spectra, variation of EIT transmission peak with ground state decay rate and excited state spontaneous decay rate are investigated. Effect of pump Rabi frequency on the transmission peak is also shown.
We report the results of an experiment showing how an opaque atomic transition in neutral Sr may be rendered transparent to radiation at its resonance frequency. This is accomplished by applying an electromagnetic coupling field (Fig. 1) between the upper state 4d5d1D2 of the transition and another state 4d5p 1D2 of the atom. When the Rabi frequency of the coupling field exceeds the inhomogeneous width of the 5s5p1P1−4d5d1D2 transition, the medium becomes transparent on line center. In this work, we have changed the transmittance of neutral strontium from exp(−20) without a coupling laser to exp(−1) in the presence of a coupling laser, over a spectral range of 6 GHz (Fig. 2). The coupling laser that we have used is a single mode Littman dye laser with an intensity of 10 MW/ cm2 .