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Updated: May 31, 2026

Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing
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Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing

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High sensitivity third-order autocorrelation measurement by intensity modulation and third harmonic detection.

Yizhen Wei1, Scott Howard, Adam Straub

  • 1School of Applied and Engineering Physics, Cornell University, Ithaca, New York 14853, USA.

Optics Letters
|June 21, 2011
PubMed
Summary

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We developed a new method for highly sensitive measurement of pulsed light at 1558 nm using a gallium arsenide phosphide (GaAsP) photomultiplier tube. This technique achieves high-sensitivity third-order autocorrelation by analyzing harmonic components in a specific absorption regime.

Area of Science:

  • Optoelectronics
  • Photonics
  • Quantum Optics

Background:

  • Accurate measurement of pulsed light is crucial in telecommunications and scientific research.
  • Existing methods may lack sensitivity or operate outside specific wavelength regimes.
  • Gallium arsenide phosphide (GaAsP) photomultiplier tubes (PMTs) are sensitive detectors but require careful characterization for specific applications.

Purpose of the Study:

  • To demonstrate a novel, high-sensitivity method for measuring pulsed light at 1558 nm.
  • To utilize a GaAsP photomultiplier tube for this measurement.
  • To achieve high-sensitivity third-order autocorrelation.

Main Methods:

  • Employed a GaAsP photomultiplier tube for light detection at 1558 nm.
  • Modulated the input optical power.

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  • Analyzed the harmonic components of the detected signal to obtain third-order autocorrelation.

    • Main Results:

    • Achieved high sensitivity in pulsed light measurement.
    • Successfully obtained third-order autocorrelation.
    • Operated in a regime characterized by a mixture of two-photon absorption and three-photon absorption within the GaAsP PMT.

    Conclusions:

    • The developed method offers a novel approach for high-sensitivity pulsed light measurement at telecommunication wavelengths.
    • The technique leverages specific nonlinear absorption properties (two-photon and three-photon absorption) in GaAsP PMTs.
    • This method provides a valuable tool for applications requiring precise characterization of pulsed light sources.