00379nas a2200109   4500008004100000245006800041210006600109260000800175300001800183490000700201856006100208       2022                        eng d00aA method for single particle tracking through a multimode fiber0 amethod for single particle tracking through a multimode fiber  cSep  a36055–360640 v30  uhttp://opg.optica.org/oe/abstract.cfm?URI=oe-30-20-3605501177nas a2200109   4500008004100000245006700041210006600108300001800174490000700192520080300199856006501002       2019                        eng d00aLabel-free CARS microscopy through a multimode fiber endoscope0 aLabelfree CARS microscopy through a multimode fiber endoscope  a30055–300660 v273 a<p>Multimode fibres have recently been employed as high-resolution ultra-thin endoscopes, capable of imaging biological structures deep inside tissue in vivo. Here, we extend this technique to label-free non-linear microscopy with chemical contrast using coherent anti-Stokes Raman scattering (CARS) through a multimode fibre endoscope, which opens up new avenues for instant and in-situ diagnosis of potentially malignant tissue. We use a commercial 125 &amp;\#x00B5;m diameter, 0.29 NA GRIN fibre, and wavefront shaping on an SLM is used to create foci that are scanned behind the fibre facet across the sample. The chemical selectivity is demonstrated by imaging 2 &amp;\#x00B5;m polystyrene and 2.5 &amp;\#x00B5;m PMMA beads with per pixel integration time as low as 1 ms for epi-detection.</p>  uhttp://www.opticsexpress.org/abstract.cfm?URI=oe-27-21-3005501094nas a2200109   4500008004100000245007300041210006900114300001800183490000700201520071100208856006500919       2019                        eng d00aWavelength dependent characterization of a multimode fibre endoscope0 aWavelength dependent characterization of a multimode fibre endos  a28239–282530 v273 a<p>Multimode fibres have recently shown promise as miniature endoscopic probes. When used for non-linear microscopy, the bandwidth of the imaging system limits the ability to focus light from broadband pulsed lasers as well as the possibility of wavelength tuning during the imaging. We demonstrate that the bandwidth is limited by the dispersion of the off-axis hologram displayed on the SLM, which can be corrected for, and by the limited bandwidth of the fibre itself. The selection of the fibre is therefore crucial for these experiments. In addition, we show that a standard prism pulse compressor is sufficient for material dispersion compensation for multi-photon imaging with a fibre endoscope.</p>  uhttp://www.opticsexpress.org/abstract.cfm?URI=oe-27-20-28239