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Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 33,
  • Issue 16,
  • pp. 3461-3468
  • (2015)

Wideband Electrically Pumped 1050-nm MEMS-Tunable VCSEL for Ophthalmic Imaging

Open Access Open Access

Abstract

In this paper, we present a 1050-nm electrically pumped microelectromechanically tunable vertical cavity surface-emitting laser (MEMS-VCSEL) with a record dynamic tuning bandwidth of 63.8 nm, suitable for swept-source optical coherence tomography (SS-OCT) imaging. These devices provide reduced cost and complexity relative to previously demonstrated optically pumped devices by obviating the need for a pump laser and associated hardware. We demonstrate ophthalmic SS-OCT imaging with the electrically-pumped MEMS-VCSEL at a 400 kHz axial scan rate for wide-field imaging of the in vivo human retina over a $12\; {\rm mm} \times 12\; {\rm mm}$ field and for OCT angiography of the macula over $6\; {\rm mm} \times 6\; {\rm mm}$ and $3\; {\rm mm} \times 3\; {\rm mm}$ fields to show retinal vasculature and capillary structure near the fovea. These results demonstrate the feasibility of electrically pumped MEMS-VCSELs in ophthalmic instrumentation, the largest clinical application of OCT. In addition, we estimate that the 3 dB coherence length in air is 225 ± 51 m, far greater than required for ophthalmic SS-OCT and suggestive of other distance ranging applications.

© 2015 OAPA

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