Dual-focus stimulated Raman scattering microscopy: a concept for multi-focus scaling

Area of Science:

• Microscopy
• Spectroscopy
• Biophysics

Background:

• High-speed imaging is crucial for live cell studies and large-area sample analysis.
• Single-focus stimulated Raman scattering (SRS) microscopy speed is limited by sample damage and laser shot noise.

Purpose of the Study:

• To develop a novel dual-focus SRS microscopy technique for enhanced imaging speed.
• To overcome the limitations of single-focus SRS microscopy.

Main Methods:

• Implemented a dual-focus SRS approach with pump lasers modulated at distinct frequencies.
• Used individual photodiodes and lock-in units for each focus to prevent cross-talk.
• Demonstrated simultaneous acquisition of laterally/axially displaced and hyperspectral SRS images.

Main Results:

• Achieved simultaneous imaging of multiple foci within the objective's field of view.
• Enabled acquisition of both spatial and spectral SRS information concurrently.
• Showcased a modular design extendable to multi-focus configurations.

Conclusions:

• The dual-focus SRS microscopy significantly enhances imaging speed compared to single-focus methods.
• The technique offers a versatile platform for advanced live cell imaging and materials science.
• Future extensions with multi-channel acousto-optic modulators and lock-in amplifiers promise further advancements.