Mr. Alfred Albert Profile

Alfred Albert

at National Taiwan Univ of Science and Technology

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SPIE Journal Paper | 4 December 2024

Alignment requirement of retro-reflective target in self-mixing interferometry

Alfred Albert, Silvano Donati, San-Liang Lee

OE, Vol. 63, Issue 12, 124102, (December 2024) https://doi.org/10.1117/12.10.1117/1.OE.63.12.124102

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It is generally assumed that using a retro-reflective surface as the target of an interferometric measurement, an accurate alignment to the illumination beam is not really necessary. On the contrary, we show that even a few degrees of angular misalignment can corrupt the interferometric signal with the onset of a large artifact, which is also misleading because it is similar to the waveform of the high-level feedback regime. We first provide the experimental evidence of the artifact in a self-mixing interferometer, showing that the artifact is canceled after an alignment to <0.2 deg error, and then provide a theoretical evaluation, in good agreement with the observations.

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