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Two-photon lensless endoscope Copy

Optics express

Authors: Andresen ER, Bouwmans G, Monneret S, Rigneault H
Date: 2013-09-01 • Pages: 20713-21 • PMID: 24103944
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We report a first demonstration of two-photon endoscopic imaging with a lensless endoscope. The endoscope probe is a double-clad bundle of single-mode fibers; point excitation and scanning is achieved by coherent combining of femtosecond light pulses propagating in the single-mode fibers; and back-scattered two-photon signal is collected through the multi-mode inner cladding. We demonstrate the two-photon endoscope on a test sample of rhodamine 6G crystals.