MEMS tunable VCSEL light source for ultrahigh speed 60kHz – 1MHz axial scan rate and long range centimeter class OCT imaging

B. Potsaid, V. Jayaraman, J. G. Fujimoto, J. Jiang, P. J. S. Heim, and A. E. Cable;

Proceedings of SPIE BiOS, vol. 8213, pp. 82130M–82130M–8, Feb. 2012. (publisher’s site);

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Presented at Photonics West / SPIE BiOS, Feb. 2012

Figures from the paper:


Imaging Depth in Tissue - Comparison

Imaging Depth in Tissue – Comparison of OCT Light Sources


Variable-Speed Imaging:

100kHz Axial Scan Rate

100kHz Axial Scan Rate

200KHz and 400kHz axial scan rate

200KHz and 400kHz

1MHz Axial Scan Rate

1MHz Axial Scan Rate


We demonstrate ultrahigh speed Swept Source / Fourier domain OCT imaging with new MEMS- tunable vertical-cavity surface-emitting laser (VCSEL) light source technology. The VCSEL achieves a combination of ultrahigh sweep speeds, adjustable sweep rates and extremely long coherence length, which cannot be simultaneously achieved with other OCT light source technologies. Although micromechanically-tunable VCSELs have been previously investigated, these results are the first to achieve ultrahigh tuning speeds in conjunction with a ~2X wider tuning bandwidth than previous VCSELs. We demonstrate OCT with record imaging ranges at sweep rates from 100kHz to 1MHz.

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