title: Use of a single-mode fiber coupler for second-harmonic-generation microscopy.
abstract: We present a compact second-harmonic-generation (SHG) microscope based on a three-port single-mode fiber coupler. The fiber coupler is used to deliver a near-infrared ultrashort-pulsed laser beam as well as to collect the SHG signal in the visible wavelength range. The SHG microscope exhibits an axial resolution of 1.8 microm, which shows a slight enhancement of the optical sectioning effect compared with that for two-photon excitation at the same excitation wavelength. It is also demonstrated that SHG and two-photon fluorescence images under parallel and perpendicular laser excitation polarization can be simultaneously obtained.
authors.affiliation: Centre for Micro-Photonics, School of Biophysical Sciences and Electrical Engineering, Swinburne University of Technology, PO Box 218, Hawthorn, Victoria 3122, Australia.
authors.forename: Ling
authors.initials: L
authors.lastname: Fu
authors.forename: Xiaosong
authors.initials: X
authors.lastname: Gan
authors.forename: Min
authors.initials: M
authors.lastname: Gu