Stimulated Raman Scattering Microscopy with a Robust Fibre Laser Source.
Christian W Freudiger, Wenlong Yang, Gary R Holtom, Nasser Peyghambarian, X Sunney Xie, Khanh Q Kieu
Author Information
Christian W Freudiger: INVENIO IMAGING, Inc., Menlo Park, California 94025 (USA) ; Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138 (USA).
Wenlong Yang: Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138 (USA).
Gary R Holtom: Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138 (USA).
Nasser Peyghambarian: College of Optical Science, University of Arizona, Tucson, Arizona 85721 (USA).
X Sunney Xie: Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138 (USA).
Khanh Q Kieu: College of Optical Science, University of Arizona, Tucson, Arizona 85721 (USA).
Stimulated Raman Scattering microscopy allows label-free chemical imaging and has enabled exciting applications in biology, material science, and medicine. It provides a major advantage in imaging speed over spontaneous Raman scattering and has improved image contrast and spectral fidelity compared to coherent anti-Stokes Raman. Wider adoption of the technique has, however, been hindered by the need for a costly and environmentally sensitive tunable ultra-fast dual-wavelength source. We present the development of an optimized all-fibre laser system based on the optical synchronization of two picosecond power amplifiers. To circumvent the high-frequency laser noise intrinsic to amplified fibre lasers, we have further developed a high-speed noise cancellation system based on voltage-subtraction autobalanced detection. We demonstrate uncompromised imaging performance of our fibre-laser based stimulated Raman scattering microscope with shot-noise limited sensitivity and an imaging speed up to 1 frame/s.
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