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Recombination Dynamics in Thin-film Photovoltaic Materials via Time-resolved Microwave Conductivity

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Two-photon free-induction decay with electromagnetically induced transparency.

J F Chen¹, Weixin Lu, Shuyuan Wang

¹Department of Physics, The Hong Kong University of Science and Technology,Clear Water Bay, Kowloon, Hong Kong, China.

|June 3, 2010

Summary

This summary is machine-generated.

Researchers observed coherent two-photon free-induction decay (FID) in a Lambda system using electromagnetically induced transparency. This groundbreaking method achieved FID signals with coherence times longer than the natural atomic lifetime.

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Area of Science:

Atomic physics
Quantum optics

Background:

Coherent two-photon free-induction decay (FID) is a phenomenon in atomic systems.
Electromagnetically induced transparency (EIT) enables manipulation of atomic coherence.

Purpose of the Study:

To observe coherent two-photon FID in a three-level Lambda system.
To achieve FID signals with coherence times exceeding the natural atomic excited-state lifetime.

Main Methods:

Utilizing a three-level Lambda system in an Rb85 cold atomic cloud.
Exciting the system with a low-intensity, square-modulated laser pulse.
Employing electromagnetically induced transparency (EIT).

Main Results:

Observed coherent two-photon FID signals for the first time.
Achieved coherence times longer than the atomic excited-state natural lifetime.
Detected FID signals on the falling edge due to on-resonance enhancement, without heterodyne detection.

Conclusions:

Demonstrated a novel method for generating long-coherence FID signals in atomic systems.
Highlighted the potential of EIT for enhancing and controlling quantum phenomena.
Opened new avenues for applications in quantum information and precision measurements.