Development of High-Speed Time-Domain En Face OCT Using a KTN Optical Beam Deflector

We developed a high-speed Time-Domain en face OCT with a KTa1‒xNbxO3 (KTN) optical beam deflector. A KTN optical beam deflector illuminates large area with fast scanning. In our imaging system, fast scanning was performed at 200 kHz by the KTN optical beam deflector, while slow scanning at 800 Hz was simultaneously performed by the galvanometer. In a preliminary experiment, we obtained en face OCT images of a human fingerprint at 800 fps, which is the fastest speed obtained by a TD-OCT. Furthermore, a 3D-OCT image was also obtained at 0.2 s by our imaging system.