Interferometric diffusing wave spectroscopy with an optical time-of-flight switch

Santosh Aparanji; Mingjun Zhao; Vivek J. Srinivasan

doi:10.1117/12.2650761

7 March 2023 Interferometric diffusing wave spectroscopy with an optical time-of-flight switch

Santosh Aparanji, Mingjun Zhao, Vivek J. Srinivasan

Proceedings Volume PC12378, Dynamics and Fluctuations in Biomedical Photonics XX; PC1237808 (2023) https://doi.org/10.1117/12.2650761
Event: SPIE BiOS, 2023, San Francisco, California, United States

Abstract

In this work, we demonstrate a fiber-based interferometric Diffuse Optical Spectroscopy (iDOS) approach to obtain quasi-concurrent information at early and late times of flight via a simple fiber optic switch. Time-of-flight (TOF) filtering is enabled by reducing the effective temporal coherence of the laser source, here achieved through rapid wavelength tuning. Early and late TOFs are alternatively interrogated by optical switches that select between reference paths with short and long time delays, respectively. This approach is used on a human forearm to obtain quasi-concurrent deep and superficial blood flow index at baseline and during occlusion.

Conference Presentation

Citation Download Citation

Santosh Aparanji, Mingjun Zhao, and Vivek J. Srinivasan "Interferometric diffusing wave spectroscopy with an optical time-of-flight switch", Proc. SPIE PC12378, Dynamics and Fluctuations in Biomedical Photonics XX, PC1237808 (7 March 2023); https://doi.org/10.1117/12.2650761

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