Abstract: This paper proposes and demonstrates an arbitrarily tunable multi-frequency pulse modulation scheme based on an active fiber loop, which effectively suppresses the interference fading effect ...

The evidence is solid but not definitive, as the conclusions rely on the absence of changes in spatial breadth and would benefit from clearer statistical justification and a more cautious ...

In this paper, a gas sensing technique based on quartz tuning fork (QTF) enhanced spectroscopy was reported for fast trace gas analysis. To demonstrate this proposed gas sensing technique, nitrogen ...