Mitsuro Sugita

Motion artifact and speckle noise reduction in polarization sensitive optical coherence tomography by retinal tracking

We present a novel polarization sensitive optical coherence tomography (PS-OCT) system with an integrated retinal tracker. The tracking operates at up to 60 Hz, correcting PS-OCT scanning positions during the acquisition to avoid artifacts caused by eye motion. To demonstrate the practical performance of the system, we imaged several healthy volunteers and patients with AMD both with B-scan repetitions for frame averaging and with 3D raster scans. Under large retinal motions with up to 1 mm amplitude at 0.5 ~a few Hz frequency range, motion artifact suppression in the PS-OCT images as well as standard deviation noise reduction in the frame averaged retardation images are presented.

Exciton–polariton lasing in a microcavity

The formation of macroscopic coherence associated with a Bose–Einstein phase transition in excitons has long been sought for. We review our recent observation of related effects of exciton–polariton lasing in a semiconductor microcavity.

Analysis of optimum conditions of depolarization imaging by polarization-sensitive optical coherence tomography in the human retina.

Abstract. Measurement and imaging of depolarization by polarization-sensitive optical coherence tomography (PS-OCT) requires averaging of Stokes vector elements within two- or three-dimensional (3-D) evaluation windows to obtain the degree of polarization uniformity (DOPU). By use of a PS-OCT system with an integrated retinal tracker, we analyze optimum conditions for depolarization imaging, data processing, and segmentation of depolarizing tissue in the human retina. The trade-offs between figures of merit like DOPU imaging sensitivity, efficiency, and susceptibility are evaluated in terms of 3-D resolution. The results are used for a new, detailed interpretation of PS-OCT high-resolution images of the human retinal pigment epithelium and Bruch’s membrane.

Fibre based polarization sensitive optical coherence tomography using a swept source at 1040 nm

We present a fiber based PS-OCT system featuring a swept source at 1040 nm with a circular input state and an A-scan rate of 100 kHz. In vivo human retina images are presented.