title: 109  MHz optical tomography using temporal magnification.
abstract: Ultrafast optical tomographic imaging with a 109 MHz A-scan rate is achieved by using temporal magnification. Based on two four-wave mixing (FWM) time lenses with carefully designed group delay dispersion, we construct a temporal imaging system with a magnification factor of 48.3×. The two time-lens scheme not only relaxes the requirement for the pump source but also facilitates the application for tomographic imaging. As a proof-of-concept demonstration, our system achieves an axial resolution of 140 μm in air (∼105  μm in biosample) over a 28 mm depth range with sensitivity up to 55 dB. We then evaluate the imaging performance using a fish-eye lens at a 109 MHz A-scan rate. Utilizing better dispersion-engineered nonlinear media, resolution of less than 5 μm in the biosample with higher sensitivity may be achieved. We believe this scheme will provide a promising solution for video-rate 3D tomographic imaging.
authors.forename: Bowen
authors.initials: B
authors.lastname: Li
authors.forename: Chi
authors.initials: C
authors.lastname: Zhang
authors.forename: Jiqiang
authors.initials: J
authors.lastname: Kang
authors.forename: Xiaoming
authors.initials: X
authors.lastname: Wei
authors.forename: Sisi
authors.initials: S
authors.lastname: Tan
authors.forename: Kenneth K Y
authors.initials: KK
authors.lastname: Wong
mesh_terms: D007909:Lenses; D013997:Time Factors; D041622:Tomography, Optical / Q000295:instrumentation / Q000379:methods*