Abstract
A new method for determining the fluorophore distribution along the propagation axis of an ultrashort optical pulse is presented. The axial resolution is obtained by temporal gating of the backward emitted fluorescence via optical parametric amplification, and we demonstrated a resolution in the order of a few 100 μm. With this approach, sampling of the fluorophore concentration of thin layers without using optics with a large numerical aperture will be possible, such as investigating the human retina via time-resolved fluorescence measurements. Additionally, we verified the gain is orders of magnitude higher for coherent seeding, making optical parametric gating very interesting for discriminating between coherently and incoherently scattered light for other multimodal imaging applications.
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Acknowledgments
The authors gratefully acknowledge support from the European Regional Development Fund (EFRE) and the state of Thuringia (TMBWK). Furthermore, we thank Dr. Schweitzer from the Department of Ophthalmology for bringing our attention to this interesting topic. We also acknowledge experimental support from Dr. Schweitzer and his coworkers.
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Gräfe, M.G.O., Hoffmann, A. & Spielmann, C. Ultrafast fluorescence spectroscopy for axial resolution of flurorophore distributions. Appl. Phys. B 117, 833–840 (2014). https://doi.org/10.1007/s00340-014-5894-y
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DOI: https://doi.org/10.1007/s00340-014-5894-y