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Multicontrast nonlinear optical microscopy with a compact and rapid pulse shaper.

Baolei Li1, Kevin E Claytor, Hsiangkuo Yuan

  • 1Department of Physics, Duke University, Durham, North Carolina 27708, USA.

Optics Letters
|June 30, 2012
PubMed
Summary

Homodyne detection enhances nonlinear microscopy sensitivity. A novel pulse shaper enables new imaging contrasts like two-photon absorption and quantum yield for biological samples.

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Area of Science:

  • Nonlinear optical microscopy
  • Quantum optics
  • Biophotonics

Background:

  • Homodyne detection significantly improves measurement sensitivity for weak optical signals.
  • Nonlinear optical microscopy offers novel intrinsic contrast mechanisms, including nonlinear absorption and phase contrast.
  • High-repetition rate mode-locked femtosecond lasers are crucial for advanced microscopy techniques.

Purpose of the Study:

  • To develop and demonstrate a compact, rapid pulse shaper for homodyne detection in nonlinear microscopy.
  • To enable sensitive imaging of intrinsic nonlinear optical contrasts.
  • To visualize biological samples with enhanced resolution and sensitivity.

Main Methods:

  • Development and implementation of a compact and rapid pulse shaper.
  • Application of homodyne detection with femtosecond lasers in nonlinear microscopy.
  • Generation of two-photon absorption (TPA) and self-phase modulation images.
  • Simultaneous imaging of two-photon luminescence and TPA.

Main Results:

  • Successful demonstration of a pulse shaper for homodyne detection in nonlinear microscopy.
  • Generation of TPA and self-phase modulation images of gold nanostars in biological samples.
  • Production of two-photon quantum yield images through simultaneous TPA and luminescence imaging.
  • Enhanced sensitivity for detecting weak nonlinear optical signals.

Conclusions:

  • The developed pulse shaper is effective for homodyne detection in high-repetition rate nonlinear microscopy.
  • This technique provides access to novel intrinsic contrast mechanisms for biological imaging.
  • Simultaneous imaging capabilities allow for comprehensive characterization, including quantum yield determination.