Journal: Biomedical Optics Express

Article Title: Vectorial birefringence imaging by optical coherence microscopy for assessing fibrillar microstructures in the cornea and limbus

doi: 10.1364/BOE.382755

Figure Lengend Snippet: System schematic. (a) The main body of the interferometer. Single-mode fibers are used throughout the system. Thick and solid cyan lines indicate free-space propagation. SC, supercontinuum; FC, fiber coupler; P, polarizer; EOM, electro-optic modulator; PP, prism pair; NDF, neutral density filter; PC, polarization controller; BS, beam splitter; PBS, polarizing beam splitter; R, reflector; SP, spectrometer. Only one coherent component of the light from the source (indicated by the orange arrows throughout) is used for imaging; whereas, the incoherent component, i.e., the orthogonally polarized light (indicated by the purple arrow), is filtered out in the sample arm and in the reference arm by the polarizers P1 and P2, respectively. The EOM modulates between A-lines the polarization state of the light passing through, such that the light of odd and even A-lines is right and left circularly polarized (for the central wavelength), respectively. (b) The setup of the sample arm. C, collimator; A, axicon; GS, galvanometric scanner; SL, scan lens; TL, tube lens; OBJ, objective; OP, object plane; FP, Fourier plane; IIP, intermediate image plane.

Article Snippet: A 4f telescope (AC254-250-B and AC254-80-B, Thorlabs Inc.) relayed the combined illumination and detection modes to an intermediate plane between a pair of galvanometric scanners (GVS112/M, Thorlabs Inc.).

Techniques: Imaging

Journal: Biomedical Optics Express

Article Title: Corneal imaging with blue-light optical coherence microscopy

doi: 10.1364/BOE.465707

Figure Lengend Snippet: Schematic diagram of the blue-light OCM system. SLED – super-luminescent light emitting diode; FC – 50:50 fiber coupler; PC – polarization controller; C1 - C3 – collimator; L1 - L4 – achromatic lenses; VFL – variable focus liquid lens; X, Y – galvanometer scanning mirrors; M – mirror; DM – dielectric mirror; VPHG – volume phase holographic grating; OL – objective lens; GPU – graphics processing unit.

Article Snippet: The 4 mm beam was then deflected by a pair of galvanometer scanners (Saturn 5B, Pangolin Laser Systems Inc., USA) to a 2× beam expander comprised of two pairs of visible achromatic doublet lenses, L1 and L2, that had effective focal lengths of 50 mm and 100 mm respectively ( ).

Techniques:

Journal: Biomedical Optics Express

Article Title: Corneal imaging with blue-light optical coherence microscopy

doi: 10.1364/BOE.465707

Figure Lengend Snippet: (a) SolidWorks mechanical layout of the sample arm. (b) Photograph of 3D printed mounts with optical components. (c) Sample (rabbit cornea) mounted on an artificial anterior chamber on a vertical stage shown in a red dashed box. C2 – collimator; L2 - L3 – achromatic lenses; VFL – variable focus liquid lens; DB – driver board for VFL; X, Y – galvanometer scanning mirrors; M – mirror; DM – dielectric mirror; OL – objective lens.

Article Snippet: The 4 mm beam was then deflected by a pair of galvanometer scanners (Saturn 5B, Pangolin Laser Systems Inc., USA) to a 2× beam expander comprised of two pairs of visible achromatic doublet lenses, L1 and L2, that had effective focal lengths of 50 mm and 100 mm respectively ( ).

Techniques:

Journal: Biomedical Optics Express

Article Title: Large area robotically assisted optical coherence tomography (LARA-OCT)

doi: 10.1364/BOE.525524

Figure Lengend Snippet: A KUKA LBR iiwa 14 R820 robot is used to position the OCT probe. Cables to drive the galvanometric mirrors are fed through 3D printed cable guides and strain reliefs. Among others a human arm replica is used as an OCT phantom and placed on a spring-loaded armrest which is used as a limit switch that can trigger an emergency stop.

Article Snippet: A pair of galvanometric scanners (dynAXIS 421, Scanlab GmbH, Germany) is used to steer the light beam across the target.

Techniques:

Journal: Biomedical Optics Express

Article Title: Large area robotically assisted optical coherence tomography (LARA-OCT)

doi: 10.1364/BOE.525524

Figure Lengend Snippet: (a) Large-area OCT image of a volunteer’s hand composed of 6 × 1 long scans with a total FOV of 140 × 170 × 20 mm 3 . The en-face is projected by averaging all 600 depth layers. Y T C P is the motion of the robot and X S C A N denotes the scanning direction of the galvanometric scanner. (b) Excerpt from (a) with visible lateral stitching artifacts indicated by the arrows. (c) 3D visualization of the first joint of the index finger. (d) 16-times averaged B-Scan along the entire hand and middle finger.

Article Snippet: A pair of galvanometric scanners (dynAXIS 421, Scanlab GmbH, Germany) is used to steer the light beam across the target.

Techniques: