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Related Experiment Videos

Two photon absorption and coherent control with broadband down-converted light.

Barak Dayan1, Avi Pe'er, Asher A Friesem

  • 1Department of Physics of Complex Systems, Weizmann Institute of Science, Rehovot 76100, Israel.

Physical Review Letters
|August 25, 2004
PubMed
Summary

We demonstrate two-photon absorption using broadband squeezed vacuum light. This method achieves high spectral and temporal resolution, enabling advanced applications in optical communications and microscopy.

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Area of Science:

  • Quantum Optics
  • Nonlinear Optics

Background:

  • Two-photon absorption (TPA) is a nonlinear optical process.
  • Broadband light sources typically have poor temporal and spectral resolution.

Purpose of the Study:

  • To demonstrate TPA using broadband squeezed vacuum light.
  • To achieve high spectral and temporal resolution with incoherent light.

Main Methods:

  • Experimentally generating two-photon absorption using broadband down-converted light (squeezed vacuum).
  • Employing pulse-shaping techniques for coherent control of TPA in rubidium.
  • Characterizing the spectral and temporal resolutions achieved.

Main Results:

  • Broadband squeezed vacuum light induced TPA with sharp temporal behavior, similar to femtosecond pulses.

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  • High spectral resolution, comparable to narrow-band lasers, was achieved.
  • Spectral and temporal resolutions were 3-5 orders of magnitude finer than the light's properties.

    • Conclusions:

    • Broadband squeezed vacuum light can be utilized for high-resolution TPA.
    • Coherent control of TPA with such light opens possibilities for advanced applications.
    • Potential applications include spread-spectrum optical communications, tomography, and nonlinear microscopy.