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Related Experiment Video

Updated: Apr 23, 2026

Direct Imaging of Laser-driven Ultrafast Molecular Rotation
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Frequency domain approach for time-resolved pump-probe microscopy using intensity modulated laser diodes.

J Miyazaki1, K Kawasumi1, T Kobayashi1

  • 1Advanced Ultrafast Laser Research Center, The University of Electro-Communications, 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585, Japan.

The Review of Scientific Instruments
|October 3, 2014
PubMed
Summary

This study introduces a novel time-resolved pump-probe microscopy technique using modulated laser diodes. It enables high-resolution analysis of ultrafast dynamics in materials and biological samples without specialized equipment.

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Spectroscopy

Background:

  • Conventional optical microscopy is limited by diffraction.
  • Characterizing ultrafast dynamics (nanosecond to picosecond) often requires expensive, high-speed equipment.
  • Nonlinear optical interactions offer potential for enhanced spatial resolution.

Purpose of the Study:

  • To develop a cost-effective time-resolved pump-probe microscopy scheme.
  • To achieve high spatial resolution for analyzing microscopic sample dynamics.
  • To enable characterization of relaxation dynamics in various materials.

Main Methods:

  • Utilized intensity-modulated laser diodes for pump and probe beams.
  • Employed frequency domain detection with a lock-in amplifier at a beat frequency (15 kHz).

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  • Varied modulation frequencies up to 500 MHz to probe different timescales.

    • Main Results:

    • Successfully characterized nanosecond to picosecond relaxation dynamics.
    • Achieved superior spatial resolution compared to diffraction-limited microscopes.
    • Demonstrated utility through time-resolved imaging of fluorescence beads and quantum dots.

    Conclusions:

    • The developed frequency domain pump-probe microscopy is a versatile tool.
    • It offers high spatial resolution and is suitable for analyzing optoelectronic devices.
    • The system's low-cost components broaden applications in photochemistry, optical physics, and biological imaging.