Abstract
To acquire stable self-mixing signals,
self-mixing interferometry is
the primary requirement for the measurement.
This paper finds that
“strange” self-mixing signals, which have an adverse effect on the
self-mixing interferometry, are related to the injection current of
the semiconductor laser based on the rate equation of the
semiconductor laser and proposes a method of guaranteeing stable
self-mixing interferometry. We believe the paper will be a milestone
that is of a vital significance in consolidating the theoretical
foundation of self-mixing interferometry and securing its
application.