1.Department of Electrical and Electronic Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong, China
2.Biomolecular Photonics, Department of Physics, University of Bielefeld, Universit?tsstr, 25, 33615 Bielefeld, Germany
3.Division of Life Science, The Hong Kong University of Science and Technology, Hong Kong, China
4.Department of Physiology, Li Ka Shing Faculty of Medicine, The University of Hong Kong, Pokfulam, Hong Kong, China
5.Department of Surgery, The University of Hong Kong, Pokfulam Road, Hong Kong, China
6.Present address: Division of Engineering and Applied Science, California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125, USA
Xiaoming Wei (xmwei@caltech.edu)
Kenneth K. Y. Wong (kywong@eee.hku.hk)
Thomas Huser (thomas.huser@physik.uni-bielefeld.de)
纸质出版日期:2020,
网络出版日期:2020-02-24,
收稿日期:2019-05-14,
修回日期:2020-01-23,
录用日期:2020-02-09
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High-contrast, fast chemical imaging by coherent Raman scattering using a self-synchronized two-colour fibre laser[J]. LSA, 2020,9(2):254-265.
Kong, C. H. et al. High-contrast, fast chemical imaging by coherent Raman scattering using a self-synchronized two-colour fibre laser. Light: Science & Applications, 9, 254-265 (2020).
High-contrast, fast chemical imaging by coherent Raman scattering using a self-synchronized two-colour fibre laser[J]. LSA, 2020,9(2):254-265. DOI: 10.1038/s41377-020-0259-2.
Kong, C. H. et al. High-contrast, fast chemical imaging by coherent Raman scattering using a self-synchronized two-colour fibre laser. Light: Science & Applications, 9, 254-265 (2020). DOI: 10.1038/s41377-020-0259-2.
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 sensitivity. However
the clinical translation of CRS imaging technologies has long been hindered by traditional solid-state lasers with environmentally sensitive operations and large footprints. Ultrafast 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 speeds. Here
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 (
<
0.5%)
modulation depth (
>
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 schemes. These 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 two-photon excited fluorescence
which provides multiple optical contrast mechanisms simultaneously and maximizes the gathered information content for biological visualization and medical diagnosis. This 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.
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