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  • Title: Thermally tuned VCSEL at 850 nm as a low-cost alternative source for full-eye SS-OCT.
    Author: Kendrisic M, Agafonov V, Salas M, Ferrara L, Niederleithner M, Resch H, Steiner S, Vass C, Drexler W, Leitgeb RA.
    Journal: Opt Lett; 2023 Jun 01; 48(11):3079-3082. PubMed ID: 37262285.
    Abstract:
    Swept-source optical coherence tomography (SS-OCT) demonstrates superior performance in comparison to spectral domain OCT with regard to depth ranging. The main driver of cost for SS-OCT systems is, however, the price of the source. Here we show a low-cost alternative swept source that uses a thermally tuned vertical-cavity surface-emitting laser (VCSEL) at 850 nm. Its center wavelength can be tuned by adjusting the operating temperature through modulation of the injection current. At 2 kHz sweep rate, the depth range of the system was 5 cm, with a sensitivity roll-off of under -3 dB across this range. The system achieved a sensitivity of 97 dB with a sample beam power of 0.3 mW and an axial resolution of 50 µm in air. To demonstrate the system performance in vivo, an eye of a healthy volunteer was measured, and full-eye scans were acquired at 25 and 50 kHz from the cornea to the retina. Based on our results, we believe that this technology can be used as a cost-effective alternative OCT for point-of-care diagnostics.
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