Compact piezoelectric transducer fiber scanning probe for optical coherence tomography

Ning Zhang, Tsung Han Tsai, Osman O. Ahsen, Kaicheng Liang, Hsiang Chieh Lee, Ping Xue, Xingde Li, James G. Fujimoto

Research output: Contribution to journalArticlepeer-review

35 Scopus citations


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 1.3× magnification, a ∼6 μm spot was scanned over a 1.2 mm diameter field. The probe was encased in a metal hypodermic tube with a ∼25 mm 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.

Original languageEnglish (US)
Pages (from-to)186-188
Number of pages3
JournalOptics Letters
Issue number2
StatePublished - Jan 15 2014

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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