Three-dimensional and C-mode OCT imaging with a compact, frequency swept laser source at 1300 nm

Area of Science:

• Biomedical Optics
• Laser Technology
• Medical Imaging

Background:

• Optical Coherence Tomography (OCT) is a powerful non-invasive imaging modality.
• High-speed and high-resolution OCT are crucial for advanced applications.
• Existing swept laser sources have limitations in speed, tuning range, and robustness.

Purpose of the Study:

• To demonstrate high-resolution, 3D OCT imaging using a novel high-speed, frequency-swept laser source.
• To present a new external cavity semiconductor laser design optimized for swept-source OCT.
• To showcase the capabilities of the developed system for comprehensive data acquisition.

Main Methods:

• Designed and implemented a new external cavity semiconductor laser with adjustable spectral filter bandwidth.
• Achieved a sweep rate of 16 kHz with a tuning range of ~133 nm and ~30 mW peak power.
• Utilized the swept laser for frequency domain reflectometry and OCT imaging.

Main Results:

• Demonstrated ~10 micrometer axial resolution in tissue and 109 dB sensitivity.
• Enabled high-speed 3D OCT imaging, including C-mode imaging and large depth-of-field data acquisition.
• Generated coherence-gated en face images similar to Optical Coherence Microscopy (OCM) and confocal microscopy-like images.

Conclusions:

• The developed high-speed swept laser enables advanced 3D OCT imaging with unprecedented detail.
• The system integrates the advantages of OCT and microscopy, offering comprehensive data acquisition.
• This technology has significant potential for various biomedical imaging applications requiring high resolution and speed.