高速MEMSスキャナを用いた第三世代SS-OCT用波長走査型光源

概要

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Optical Coherence Tomography (OCT) is an imaging technology that has stimulated considerable interest in the medical application, because it can noninvasively observe cross section of an object such as retina and skin tissues. Fast Swept Source OCT (SS-OCT) is one of the promising methods thanks to the high-speed frame rate and large S/N ratio comparing with those of the conventional time-domain OCT. Key specifications of OCT are frame rate, resolution and penetration depth of the light. In particular, fast frame rate over 100 kHz is required for the next generation OCT. We have developed a fast swept-source laser using a micro electro mechanical systems (MEMS) optical scanner of 2-degrees of freedom (2-DOF) vibration mechanism and demonstrated the OCT at 140 kHz utilizing bi-directional wavelength sweep.