Handheld common-path swept-source optical coherence tomography angiography

Yu Huan Chang, Chen Yi Chen, Wen Chuan Kuo*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


This study develops a handheld optical coherence tomography angiography (OCTA) system that uses a high-speed (200 kHz) swept laser with a dual-reference common-path configuration for stable and fast imaging. The common-path design automatically avoids polarization and dispersion mismatches by using one circulator as the primary system element, ensuring a cost-effective and compact design for handheld probe use. With its stable envelope (i.e., sub-µm shifts) and phase variation (corresponding to nm changes in axial displacement), the minimum detectable flow velocity is ∼ 0.08 mm/s in our experiment, which gives the common-path setup a high potential for application in a handheld OCTA system for clinical skin screening. In vivo skin structures and microvasculature networks on the dorsum of the hand and cheek of a healthy human are imaged successfully.

Original languageEnglish
Pages (from-to)3913-3916
Number of pages4
JournalOptics Letters
Issue number15
StatePublished - 1 Aug 2023


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