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Updated: Jul 11, 2025
Pulsed Laser Diode-Based Desktop Photoacoustic Tomography for Monitoring Wash-In and Wash-Out of Dye in Rat Cortical Vasculature
Published on: May 30, 2019
Overdriven laser diode optoacoustic microscopy
Markus Seeger1,2, Antonios Stylogiannis1,2, Ludwig Prade1,2
1Chair of Biological Imaging at the Central Institute for Translational Cancer Research (TranslaTUM), School of Medicine, Technical University of Munich, Ismaninger St 22, 81675, Munich, Germany.
This study introduces novel laser diode modulation techniques for affordable, high-resolution optoacoustic microscopy. These methods enable multi-wavelength imaging, visualizing biological processes like vascular oxygenation and tumor cells with enhanced performance.
Area of Science:
- Biomedical Optics
- Microscopy
- Laser Technology
Background:
- Traditional optoacoustic microscopy often requires expensive or bulky laser systems.
- Limitations in pulse energy and beam quality hinder the use of cost-effective laser diodes.
Purpose of the Study:
- To develop a cost-effective, tunable, and miniaturizable optoacoustic microscopy system using laser diodes.
- To demonstrate concurrent multi-wavelength optoacoustic microscopy with high resolution and signal-to-noise ratio.
Main Methods:
- Utilized two novel modulation concepts: overdriving continuous-wave laser diodes (CWLD) and frequency-wavelength multiplexing (FWM).
- Implemented an adaptable trigger engine for high-repetition-rate (1 MHz) imaging.
- Compared FWM with wavelength-alternating acquisition using identical optical components.
Main Results:
- Achieved concurrent multi-wavelength optoacoustic microscopy with signal-to-noise ratios >17 dB.
- Obtained sub-2 µm resolution at 1 MHz repetition rates.
- Demonstrated superior performance over conventional systems by visualizing vascular oxygenation dynamics and circulating tumor cells in mice.
Conclusions:
- Laser diodes can be effectively utilized for advanced optoacoustic microscopy, offering a more affordable and compact solution.
- The developed modulation techniques enable high-performance, multi-wavelength imaging for various biomedical applications.
- This technology paves the way for accessible and miniaturizable optoacoustic microscopy systems.
