Enabling full 3D OCT images
OCTLIGHT is developing a swept light source for medical imaging by Optical Coherence Tomography (OCT).
OCT is a technology for non-invasive optical imaging of tissue. OCT is widely adopted within eye care where it is the gold standard for in vivo imaging of the retina. The eye specialist can perform non-invasive optical biopsies using the OCT technique. This allows the doctor to see a cross-section of the retina of the eye where the sharp vision is formed. Full 3D wide-field OCT scans has the potential to become a comprehensive tool for mapping out all the layers of the eye with better results in diagnosis and treatment. Currently OCT scanning is limited by the imaging speed possible with the present technology. Swept Source OCT using improved swept light source is making wide-field OCT imaging possible.
The swept light source module is based on a semiconductor laser diode with an integrated wavelength sweeping mechanism. The laser diode is a Vertical-Cavity Surface-Emitting Laser that has single-mode light emission and long coherence length. The wavelength sweep is implemented using a Micro-Electro-Mechanical System by which a stable and rapid wavelength sweep results.
The technology has the following properties:
Center wavelength of 1060 nm for deeper penetration into the eye (choroid imaging)
High sweep rates for wide-field, video-rate and high-resolution 3D imaging
Long imaging range by its inherently long coherence length of more than 50 mm
Less constraint on sample positioning and simplified design of scanning equipment
Better sweep stability enabling high-quality imaging and phase-sensitive OCT (e.g. angiography)
Heritage of world's first
The OCTLIGHT technology is based on research performed at The Technical University of Denmark (DTU). The Department of Photonics at DTU was the first in the world to demonstrate a tunable and electrical pumped VCSEL at 1060 nm. OCTLIGHT has exclusive license to the patent applications protecting the key unique features.
T. Ansbaek, I. Chung, E. S. Semenova and K. Yvind, “1060-nm Tunable Monolithic High Index Contrast Subwavelength Grating VCSEL,” in IEEE Photonics Technology Letters, vol. 25, no. 4, pp. 365-367, Feb.15, 2013,doi: 10.1109/LPT.2012.2236087.
T. Ansbæk, I. Chung, E. S. Semenova, O. Hansen and K. Yvind, “Resonant MEMS Tunable VCSEL,” in IEEE Journal of Selected Topics in Quantum Electronics, vol. 19, no. 4, pp. 1702306-1702306, July-Aug. 2013, Art no. 1702306, doi: 10.1109/JSTQE.2013.2257164.
OCTLIGHT has expertise in fabrication of semiconductor devices, optical systems and driver electronics. We have access to semiconductor fabrication and device testing. We have a team of motivated and highly talented engineers working on the technology as well as a network of consultants and suppliers to support us in the development of the swept source product.