Journal: Biomedical Optics Express

Article Title: Suppression of the non-linear background in a multimode fibre CARS endoscope

doi: 10.1364/BOE.450375

Figure Lengend Snippet: CARS imaging of beads through MMFs with and without step-index splices. A. CARS images of 2μ μ m polystyrene beads on glass slide taken at 3059cm− − 1 in transmission and images taken with the sample moved out of the focus. B. Difference between the images in A with and without sample for the Prysmian fibre. C. Images of PS beads with epi-detection for the custom GRIN fibre. D. Bead to background intensity ratio as a function of the splice length for the custom GRIN fibre.

Article Snippet: For the splices, we used a commercially available SI silica multimode fibre CeramOptec Optran Ultra WFGE ( 100 / 110 μ μ m , 0.37 NA). fig ft0 fig mode=article f1 fig/graphic|fig/alternatives/graphic mode="anchored" m1 Open in a separate window Fig. 2. caption a7 CARS imaging of beads through MMFs with and without step-index splices.

Techniques: Imaging, Transmission Assay

Journal: Biomedical Optics Express

Article Title: Suppression of the non-linear background in a multimode fibre CARS endoscope

doi: 10.1364/BOE.450375

Figure Lengend Snippet: Evaluation of the quality of the focused points. A. Point spread functions for three different probes measured at 789nm . B. Spot quality (power ratio, spot size and spot length) for two wavelengths as a function of the length of the splice. The value 0mm corresponds to a GRIN fibre without a splice, the value 30mm to a SI fibre. The dashed lines denote the diffraction-limited size given by the numerical aperture of the fibre. The error bars show the range of values across a 50μ μ m field of view with the highest power ratio and the smallest spot size being on the axis and the lowest power ratio and the highest spot size at the edge of the field of view. This spot size and power ratio distribution is characteristic of GRIN fibres [35] and an effect of their refractive index profile. C. An example of the distribution of the power ratio across the field of view, measured at 789nm for two different probes. D. Wavelength tuning range (FWHM of spot intensity as a function of wavelength) as a function of the length of the splice. The error bars show one standard deviation across a 50μ μ m field of view.

Article Snippet: For the splices, we used a commercially available SI silica multimode fibre CeramOptec Optran Ultra WFGE ( 100 / 110 μ μ m , 0.37 NA). fig ft0 fig mode=article f1 fig/graphic|fig/alternatives/graphic mode="anchored" m1 Open in a separate window Fig. 2. caption a7 CARS imaging of beads through MMFs with and without step-index splices.

Techniques: Refractive Index, Standard Deviation