High-Speed Stimulated Raman Scattering Microscopy Using Inertia-Free AOD Scanning

Area of Science:

• Optics and Photonics
• Biomedical Imaging
• Microscopy

Background:

• High-throughput stimulated Raman scattering (SRS) microscopy enables chemical-specific imaging of tissues.
• Conventional SRS microscopy is limited by slow mapping speeds due to mechanical inertia in scanning systems.

Purpose of the Study:

• To develop an inertia-free, high-speed SRS microscopy system for rapid, large-field tissue imaging.
• To overcome the speed limitations of conventional galvanometer-based SRS systems.

Main Methods:

• Implemented an acousto-optic deflector (AOD)-based system for inertia-free beam steering.
• Utilized spectral compression systems to convert femtosecond pulses to picosecond lasers, mitigating AOD-induced beam distortion.
• Achieved high-resolution SRS imaging of biological samples.

Main Results:

• Demonstrated inertia-free SRS microscopy with significantly enhanced mapping speed.
• Successfully imaged a 12 × 8 mm² mouse brain slice in 8 minutes at ~1 μm resolution.
• Acquired 32 slices of a whole mouse brain in 12 hours, showcasing large-volume imaging capability.

Conclusions:

• The AOD-based inertia-free SRS microscopy offers a substantial speed improvement for large-scale chemical imaging.
• This technology has the potential for broad-spectrum applications in future chemical imaging research.
• Further upgrades could lead to even faster imaging speeds, expanding its utility.