Journal
OPTICS EXPRESS
Volume 16, Issue 7, Pages 5000-5006Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.16.005000
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We report the investigation and implementation of a compact second harmonic generation microscope that uses a single-mode fiber coupler and a double-clad photonic crystal fiber. Second harmonic polarization anisotropy through the fiber-optic microscope systems is quantitatively measured with KTP microcrystals, fish scale and rat tail tendon. It is demonstrated that the polarized second harmonic signals can be excited and collected through the single-mode fiber coupler to analyze the molecular orientations of structural proteins. It has been discovered that a double-clad photonic crystal fiber can preserve the linear polarization in the core, although a depolarization effect is observed in the inner cladding region. The feasibility of polarization anisotropy measurements in fiberoptic second harmonic generation microscopy will benefit the in vivo study of collagen-related diseases with a compact imaging probe. (C) 2008 Optical Society of America.
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