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Abstract
In this Letter, we present a passively synchronized dual-color fiber laser at 1.03 and 1.53 µm for coherent anti-Stokes Raman scattering (CARS) microscopy. This fiber laser consists of both Yb- and Er-doped laser cavities, combined by an ${\sim}{1.2}\;{\rm m}$ common branch with a single-walled carbon-nanotube-based saturable absorber. Stable passively synchronized mode-locked state is obtained within a total cavity length mismatch of 50 µm. We demonstrate the capability of the synchronized dual-color fiber laser for CARS spectroscopy in both low- and high-wavenumber regions, with a resolution of ${6.6}\;{{\rm cm}^{- 1}}$. Furthermore, a CARS image in the field of view ${150} \times {60}\;{{\unicode{x00B5}{\rm m}}^2}$ of polystyrene at the Raman shift of ${3041}\;{{\rm cm}^{- 1}}$ has also been achieved. The results show the feasibility of our passively synchronized dual-color fiber laser to be employed as a stable and low-cost ultrafast laser source for CARS.
© 2020 Optical Society of America
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