Simultaneous dual-wavelength-band common-path swept-source optical coherence tomography with single polygon mirror...

Area of Science:

• Biomedical Optics
• Optical Imaging
• Medical Technology

Background:

• Optical Coherence Tomography (OCT) is a powerful non-invasive imaging modality.
• Dual-wavelength OCT offers enhanced contrast and functional information.
• Existing systems often face limitations in speed and complexity.

Purpose of the Study:

• To develop a novel simultaneous dual-band swept-source optical coherence tomography (SS-OCT) system.
• To enable high-speed, in vivo imaging at two distinct wavelengths (1310 nm and 1550 nm).
• To explore potential applications in functional spectroscopic investigations.

Main Methods:

• A novel simultaneous 1310/1550 nm two-wavelength band swept laser source was engineered.
• Synchronized dual-wavelength tuning was achieved using two laser cavities and a single scanner.
• Broadband wavelength-division multiplexing coupled the two wavelengths into a common-path fiber probe for dual-band SS-OCT.

Main Results:

• Simultaneous swept-source laser operation at 1310 nm (1227-1387 nm) and 1550 nm (1519-1581 nm) was demonstrated.
• Average output powers of 60 mW (1310 nm) and 27 mW (1550 nm) were achieved.
• High-speed A-scan rate of 65 kHz was maintained for simultaneous dual-band imaging.

Conclusions:

• A novel dual-band common-path SS-OCT system was successfully developed.
• The system enables simultaneous high-speed imaging at 1310 nm and 1550 nm.
• This technology holds significant potential for advanced in vivo functional and spectroscopic imaging applications.