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Optics Letters

Optics Letters


  • Editor: Xi-Cheng Zhang
  • Vol. 39, Iss. 12 — Jun. 15, 2014
  • pp: 3394–3397

Coherence properties of amplified slow light by four-wave mixing

Ya-Fen Hsiao, Pin-Ju Tsai, Chi-Ching Lin, Yong-Fan Chen, Ite A. Yu, and Ying-Cheng Chen  »View Author Affiliations

Optics Letters, Vol. 39, Issue 12, pp. 3394-3397 (2014)

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We present an experimental study of the coherence properties of amplified slow light by four-wave mixing (FWM) in a three-level electromagnetically induced transparency (EIT) system driven by one additional pump field. High energy gain (up to 19) is obtained with a weak pump field (a few mW/cm2) using optically dense cold atomic gases. A large fraction of the amplified light is found to be phase incoherent to the input signal field. The dependence of the incoherent fraction on pump field intensity and detuning and the control field intensity is systematically studied. With the classical input pulses, our results support a recent theoretical study by Lauk et al. [Phys. Rev. A 88, 013823 (2013)], showing that the noise resulting from the atomic dipole fluctuations associated with spontaneous decay is significant in the high gain regime. This effect has to be taken into consideration in EIT-based applications in the presence of FWM.

© 2014 Optical Society of America

OCIS Codes
(270.2500) Quantum optics : Fluctuations, relaxations, and noise
(190.4223) Nonlinear optics : Nonlinear wave mixing

ToC Category:
Nonlinear Optics

Original Manuscript: March 21, 2014
Revised Manuscript: April 25, 2014
Manuscript Accepted: April 26, 2014
Published: June 3, 2014

Ya-Fen Hsiao, Pin-Ju Tsai, Chi-Ching Lin, Yong-Fan Chen, Ite A. Yu, and Ying-Cheng Chen, "Coherence properties of amplified slow light by four-wave mixing," Opt. Lett. 39, 3394-3397 (2014)

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