Results: 4

1.
Fig. 3

Fig. 3. From: Correction of coherence gate curvature in high numerical aperture optical coherence imaging.

OCM images of (a), (b) a standard USAF resolution chart, (c), (d) 50 nm Fe2O3 particles embedded in silicon gel, and (e), (f) in vivo human skin epidermis. Images are shown in (b), (d), (f) with and (a), (c), (e) without correcting the coherence gate curvature. The scale bar is 45 µm.

Benedikt W. Graf, et al. Opt Lett. ;35(18):3120-3122.
2.
Fig. 4

Fig. 4. From: Correction of coherence gate curvature in high numerical aperture optical coherence imaging.

(Color online) (a) Image quality metrics that can be used to find the depth corresponding to the focus. Metrics are plotted as a function of shift from the calibration focus for OCM images of in vivo human skin epidermis. OCM images are shown at (b) 34, (c) 26, and (d) 19 µm, along with (e) a corresponding MPM image. To reduce speckle, the OCM images in (b)–(d) are averages of three en face planes.

Benedikt W. Graf, et al. Opt Lett. ;35(18):3120-3122.
3.
Fig. 2

Fig. 2. From: Correction of coherence gate curvature in high numerical aperture optical coherence imaging.

(Color online) (a) Schematic of the sample arm. (b) The spectral interference pattern and the unwrapped phase of the analytic signal with a mirror at the focus of the sample arm. (c) Image mapping the optical delay to the focal plane, showing the curvature of the coherence gate caused by scanning over an ~200 µm FOV. (d) FFT of the raw spectrum. (e) FFT after multiplying the spectrum by the conjugate of the measured spectral phase profile. The arrows indicate the focus depth.

Benedikt W. Graf, et al. Opt Lett. ;35(18):3120-3122.
4.
Fig. 1

Fig. 1. From: Correction of coherence gate curvature in high numerical aperture optical coherence imaging.

(Color online) (a) Schematic for a simplified non-telecentric beam-scanning system. The dotted gray line shows the flat focal plane, while the dashed gray curve shows the curved coherence gate. (b) Scanning in two dimensions results in a circular pattern of path length variations across the field of view. (c) The calculated maximum path length difference plane across a fixed FOV (solid blue curve) and the Rayleigh range of the focused beam as a function of the focal length (dashed red curve).

Benedikt W. Graf, et al. Opt Lett. ;35(18):3120-3122.

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