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Related Experiment Video

Updated: Jul 9, 2026

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

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Published on: May 30, 2014

Demonstration of highly efficient photon echoes.

C Sjaarda Cornish, W R Babbitt, L Tsang

|December 11, 2007

Summary

This summary is machine-generated.

Researchers demonstrated highly efficient photon echoes in an absorbing medium. This study achieved over 100% echo efficiency in a thulium-doped YAG crystal, a significant advancement for optical data storage.

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Area of Science:

Quantum optics
Solid-state physics
Photonics

Background:

Photon echoes are coherent optical transients used in spectroscopy and optical data storage.
Achieving high recall efficiency in optically thick media remains a challenge due to signal absorption.

Purpose of the Study:

To experimentally demonstrate highly efficient two-pulse and stimulated photon echoes in an absorbing medium.
To achieve uncorrected echo efficiencies greater than 100% with good signal fidelity.

Main Methods:

Utilized a Tm:YAG crystal with an absorption length of 3.8.
Experimentally measured recall efficiencies for two-pulse and stimulated photon echoes.
Focused on uncorrected efficiencies, excluding decay and beam profile factors.

Main Results:

Achieved a recall efficiency of 235% for two-pulse photon echoes.
Measured a recall efficiency of 150% for stimulated photon echoes.
Demonstrated excellent signal contrast in both echo types.

Conclusions:

This work represents the first demonstration of uncorrected echo efficiency exceeding 100% in an optically thick medium.
The high efficiencies achieved suggest potential for advanced optical memory and signal processing applications.
The Tm:YAG crystal proves effective for high-efficiency photon echo generation.