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Adaptive-optics ultrahigh-resolution optical coherence tomography


Merging of ultrahigh-resolution optical coherence tomography (UHR OCT) and adaptive optics (AO), resulting in high axial (3 µm3 µm) and improved transverse resolution (510 µm5–10 µm) is demonstrated for the first time to our knowledge in in vivo retinal imaging. A compact (300 mm×300 mm300 mm×300 mm) closed-loop AO system, based on a real-time Hartmann–Shack wave-front sensor operating at 30 Hz and a 37-actuator membrane deformable mirror, is interfaced to an UHR OCT system, based on a commercial OCT instrument, employing a compact Ti:sapphire laser with 130-nm bandwidth. Closed-loop correction of both ocular and system aberrations results in a residual uncorrected wave-front rms of 0.1 µm0.1 µm for a 3.68-mm pupil diameter. When this level of correction is achieved, OCT images are obtained under a static mirror configuration. By use of AO, an improvement of the transverse resolution of two to three times, compared with UHR OCT systems used so far, is obtained. A significant signal-to-noise ratio improvement of up to 9 dB in corrected compared with uncorrected OCT tomograms is also achieved.

© 2004 Optical Society of America

doi: /10.1364/OL.29.002142

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