Compact simultaneous label-free autofluorescence multi-harmonic microscopy for user-friendly photodamage-monitored...

Area of Science:

• Biomedical Optics
• Microscopy Techniques
• Nonlinear Optics

Background:

• Label-free nonlinear optical microscopy is crucial for biomedical research.
• Photodamage poses a significant limitation to clinical applications of current microscopy techniques.

Purpose of the Study:

• To develop a novel microscopy platform to reduce photodamage in label-free imaging.
• To enhance imaging speed and safety for clinical translation.

Main Methods:

• Constructed a Simultaneous Label-free Autofluorescence Multi-harmonic (SLAM) microscopy platform.
• Integrated four-channel multimodal imaging, inline photodamage monitoring, and pulse repetition-rate tuning.
• Utilized photonic crystal fiber for spectral broadening and prism compressor for pulse pre-chirping.

Main Results:

• Achieved label-free multichannel imaging with one excitation pulse per pixel.
• Demonstrated independent adjustment of pulse width, repetition rate, and energy for optimized imaging.
• Enabled high signal-to-noise ratio (SNR) imaging with minimal phototoxicity.

Conclusions:

• SLAM microscopy offers a robust, user-friendly platform for high-speed, low-photodamage imaging.
• The system's tunable parameters allow for optimization across diverse biomedical applications.
• Facilitates safer and more efficient biomedical research and potential clinical use.