Stimulated Raman scattering imaging by continuous-wave laser excitation

Area of Science:

• Biomedical Optics
• Microscopy
• Spectroscopy

Background:

• Stimulated Raman scattering (SRS) microscopy offers label-free chemical imaging capabilities.
• Traditional SRS microscopy often relies on expensive pulsed lasers and complex setups.
• Electronic background noise can hinder sensitivity in SRS imaging.

Purpose of the Study:

• To develop a cost-effective SRS microscope.
• To demonstrate the feasibility of using continuous-wave (cw) lasers for SRS imaging.
• To apply cw-SRS for imaging lipid accumulation in fatty liver disease.

Main Methods:

• Utilized continuous-wave (cw) lasers as excitation sources for SRS.
• Implemented a dual modulation scheme to suppress electronic background.
• Performed SRS imaging targeting the C-H stretch vibration of lipids.

Main Results:

• Successfully demonstrated a low-cost SRS microscope.
• The dual modulation scheme effectively removed electronic background noise.
• Achieved label-free imaging of lipids in a fatty liver model.

Conclusions:

• Continuous-wave lasers are a viable and affordable alternative for SRS microscopy.
• The developed cw-SRS system provides a sensitive platform for lipid imaging.
• This technology has potential applications in diagnosing and studying metabolic diseases like fatty liver.