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Nano-FROG: Frequency resolved optical gating by a nanometric object.

Jerome Extermann1, Luigi Bonacina, Francois Courvoisier

  • 1Université de Genève, GAP-Biophotonics, 20 rue de l'Ecole de Médecine, 1211 Geneva, Switzerland.

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|July 9, 2008
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Summary
This summary is machine-generated.

We developed a new method using a single nanocrystal to measure ultrashort laser pulses with high spatial resolution. This technique can advance phase-sensitive microscopy for detailed environmental probing.

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Microscopy

Background:

  • Characterizing ultrashort laser pulses is crucial for advanced optical techniques.
  • High numerical aperture objectives are essential for high-resolution microscopy.
  • Nonlinear optical media are used for pulse characterization methods like FROG.

Purpose of the Study:

  • To present a novel technique for spatial characterization of ultrashort pulses at the focal plane of a high numerical aperture objective.
  • To demonstrate the use of a single nanocrystal as a nonlinear medium for pulse measurement.
  • To explore the extension of this technique for phase-sensitive microscopy.

Main Methods:

  • Performing Frequency-Resolved Optical Gating (FROG) measurements.
  • Utilizing a single nanocrystal as the nonlinear medium.
  • Focusing ultrashort pulses through a high numerical aperture objective.

Main Results:

  • Achieved unprecedented spatial resolution in characterizing ultrashort pulses.
  • Demonstrated the feasibility of using a single nanocrystal for nonlinear optical measurements.
  • Established a foundation for phase-sensitive laser scanning microscopy.

Conclusions:

  • The nanocrystal-based FROG technique offers a new pathway for high-resolution ultrashort pulse characterization.
  • This method can be integrated into laser scanning microscopy to probe microscopic environments.
  • Monitoring pulse distortions provides insights into the sample's optical properties.