We developed a compact, optical fiber scanning piezoelectric transducer (PZT) probe for endoscopic and minimally invasive optical coherence tomography (OCT). Compared with previous forward-mount fiber designs, we present a reverse-mount design that achieves a shorter rigid length. The fiber was mounted at the proximal end of a quadruple PZT tube and scanned inside the hollow PZT tube to reduce the probe length. The fiber resonant frequency was 338 Hz using a 17-mm-long fiber. A 0.9 mm fiber deflection was achieved with a driving amplitude of 35 V. Using a GRIN lens-based optical design with a magnification, a spot was scanned over a 1.2 mm diameter field. The probe was encased in a metal hypodermic tube with a rigid length and covered with a 3.2 mm outer diameter (OD) plastic sheath. Imaging was performed with a swept source OCT system based on a Fourier domain modelocked laser (FDML) light source at a 240 kHz axial scan rate and 8 μm axial resolution (in air). En face OCT imaging of skin in vivo and human colon ex vivo was demonstrated.
© 2014 Optical Society of AmericaFull Article | PDF Article
Xiumei Liu, Michael J. Cobb, Yuchuan Chen, Michael B. Kimmey, and Xingde Li
Opt. Lett. 29(15) 1763-1765 (2004)
Alexandre R. Tumlinson, Jennifer K. Barton, Boris Považay, Harald Sattman, Angelika Unterhuber, Rainer A. Leitgeb, and Wolfgang Drexler
Opt. Express 14(5) 1878-1887 (2006)
Woonggyu Jung, Daniel T. McCormick, Yeh-Chan Ahn, Ali Sepehr, Matt Brenner, Brian Wong, Norman C. Tien, and Zhongping Chen
Opt. Lett. 32(22) 3239-3241 (2007)