Related Experiment Video
Updated: Jul 6, 2026
14:16
Fluorescence detection methods for microfluidic droplet platforms
Published on: December 10, 2011
Implementation of intensity-modulated laser diodes in time-resolved, pump-probe fluorescence microscopy
Applied Optics
|March 22, 2008
Summary
We developed a new pump-probe fluorescence microscopy technique using modulated laser diodes. This method achieves high-contrast, time-resolved imaging, enabling detailed study of fluorescent samples.
Area of Science:
- Biophysics
- Optical Microscopy
- Spectroscopy
Background:
- Frequency-domain pump-probe fluorescence microscopy is crucial for studying molecular dynamics.
- Existing methods often require complex or expensive equipment for high-resolution imaging.
Purpose of the Study:
- To implement intensity-modulated laser diodes for advanced pump-probe fluorescence microscopy.
- To demonstrate a cost-effective approach for high-contrast, time-resolved imaging.
Main Methods:
- Utilized two sinusoidally modulated laser diodes (635 nm excitation, 680 nm stimulated emission).
- Modulated lasers at 80 MHz with a 5 kHz offset to generate a cross-correlation fluorescence signal.
- Performed imaging on fluorescent microspheres and TOTO-3 labeled cells.
Main Results:
- Generated a distinct 5 kHz cross-correlation fluorescence signal at the focal volume.
- Achieved high-contrast microscope images using the cross-correlation signal.
- Acquired time-resolved, high-frequency information without high-speed detectors.
Conclusions:
- Demonstrated the feasibility of using modulated laser diodes for pump-probe imaging.
- This technique offers a promising pathway for high-contrast, time-resolved imaging with affordable laser systems.
