title: Ultrawideband photonic crystal fiber coupler for multiband optical imaging system.
abstract: We report a photonic crystal fiber (PCF) coupler having an ultrawide spectral bandwidth keeping single mode operation. The use of the PCF coupler in a fiber-based optical coherence tomography (OCT) system enables us to handle the wide spectral bands of various light sources, including superluminescent diodes (SLDs) at 1300 nm and 820 nm, Ti:sapphire lasers, and white-light sources. The multiband imaging performances of the PCF-based OCT system are demonstrated by obtaining dental images at 1300 nm and 820 nm with the same setup. In addition, we show that the PCF coupler could cover the spectrum over a one octave span and guide both the fundamental wave (1030 nm) and the second harmonic wave (515 nm) simultaneously.
authors.affiliation: Division of Instrument Development, Korea Basic Science Institute, 113 Gwahangno, Yusung-gu, Daejeon 305-333, Korea.
authors.forename: Seon Young
authors.initials: SY
authors.lastname: Ryu
authors.forename: Hae Young
authors.initials: HY
authors.lastname: Choi
authors.forename: Eun Seo
authors.initials: ES
authors.lastname: Choi
authors.forename: Ivan
authors.initials: I
authors.lastname: Tomov
authors.forename: Zhongping
authors.initials: Z
authors.lastname: Chen
authors.forename: Byeong Ha
authors.initials: BH
authors.lastname: Lee
mesh_terms: D003460:Crystallization; D006801:Humans; D007834:Lasers; D055100:Optical Fibers; D041623:Tomography, Optical Coherence / Q000295:instrumentation*; D014070:Tooth / Q000033:anatomy & histology