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High-contrast,fast chemical imaging by coherent Raman scattering using a self-synchronized two-colour fibre laser

Light(Science & Applications) 2020年第1期9卷 1775-1786页

作者： Cihang Kong Christian Pilger henning hachmeister Xiaoming Wei Tom H.Cheung Cora S.W.Lai Nikki P.Lee Kevin K.Tsia Kenneth K.Y.Wong Thomas Huser Department of Electrical and Electronic Engineering The University of Hong KongPokfulam RoadHong KongChina Biomolecular Photonics Department of PhysicsUniversity of BielefeldUniversitatsstr2533615 BielefeldGermany Division of Life Science The Hong Kong University of Science and TechnologyHong KongChina Department of Physiology Li Ka Shing Faculty of MedicineThe University of Hong KongPokfulamHong KongChina Department of Surgery The University of Hong KongPokfulam RoadHong KongChina Division of Engineering and Applied Science California Institute of Technology1200 East California BoulevardPasadenaCA 91125USA

Coherent Raman scattering(CRS)microscopy is widely recognized as a powerful tool for tackling biomedical problems based on its chemically specific label-free contrast,high spatial and spectral resolution,and high ***,the clinical translation of CRS imaging technologies has long been hindered by traditional solid-state lasers with environmentally sensitive operations and large *** fibre lasers can potentially overcome these shortcomings but have not yet been fully exploited for CRS imaging,as previous implementations have suffered from high intensity noise,a narrow tuning range and low power,resulting in low image qualities and slow imaging ***,we present a novel high-power self-synchronized two-colour pulsed fibre laser that achieves excellent performance in terms of intensity stability(improved by 50 dB),timing jitter(24.3 fs),average power fluctuation(20 dB)and pulse width variation(<1.8%)over an extended wavenumber range(2700-3550 cm^(−1)).The versatility of the laser source enables,for the first time,high-contrast,fast CRS imaging without complicated noise reduction via balanced detection *** capabilities are demonstrated in this work by imaging a wide range of species such as living human cells and mouse arterial tissues and performing multimodal nonlinear imaging of mouse tail,kidney and brain tissue sections by utilizing second-harmonic generation and twophoton excited fluorescence,which provides multiple optical contrast mechanisms simultaneously and maximizes the gathered information content for biological visualization and medical *** work also establishes a general scenario for remodelling existing lasers into synchronized two-colour lasers and thus promotes a wider popularization and application of CRS imaging technologies.

关键词： scattering tuning fibre

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