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Efficient broadband spectrum oscillation was obtained directly from a laser-diode-pumped Kerr-lens mode-locked Yb:YAG laser with intracavity nonlinear media. The spectrum was expanded to around 1040 nm to 1070 nm. The spectrum is much broader than the fluorescence spectrum at 1050 nm.
An endomicroscope with enhanced signal collection efficiency was developed using customized double-clad fiber and aspherical compound-lens. Ex vivo two-photon fluorescence imaging of epithelial tissues was demonstrated for the first time with an all-fiber-optic scanning endomicroscope.
We demonstrate a silicon diffractive element that serves as an optical tweezer in the near infrared and as a fluorescence collector in the visible. The 1.3 NA lens is achromatic and has high diffraction efficiency.
Our simulations show that highly localized field enhancement produced by a periodic array of silver nanoantennas can be translated to the far side of a metal-dielectric composite superlens composed of silver and silica components.
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