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Extended Coherence Range Megahertz FDML Laser for Imaging the Human Anterior Segment

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Abstract

We present a 1300nm Fourier domain mode locked (FDML) laser for optical coherence tomography (OCT) application with greatly improved coherence length operating at a scan rate of 1.6 MHz. The coherence length and hence the available imaging range was more than doubled compared to previously published MHz FDML setups by reducing the dispersion in the fiber delay line of the FDML laser. The new setup reaches a 6dB sensitivity roll-off at >4.5mm imaging depth. The usable depth range is mainly limited by the available analog detection bandwidth. Scan range and imaging depth can be traded off by adjusting the sweep range. We demonstrate OCT imaging of the anterior segment of the human eye.

© 2012 Optical Society of America

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