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Frequency-shifted Laser Feedback Interferometry in Non-planar Ring Oscillators by Zhu, Rong; Gong, Xuezhen; Li, Wenxun; Zhou, Ghuobin; Fan, Weitong; Liu, Danqing; Ma, Chunzhao; Xu, Jie; Guo, Changlei; Yeh, Hsien-Chi is a scholarly article available to read on EtoBox.

What is Frequency-shifted Laser Feedback Interferometry in Non-planar Ring Oscillators about?

Laser feedback interferometry (LFI) has a wide range of applications such as displacement, distance and velocity measurements. LFI has been realized in many types of lasers but has never been reported in non-planar ring oscillators (NPRO) to the best of our knowledge. In this letter, we present a new type of LFI based on an NPRO laser. The intrinsic resistance to optical feedback in NPROs is broken under weak-magnetic-intensity condition, where stable bidirectional lasing is initiated in the ring cavity. The interference signal, i.e., the beat of the bidirectional lasing is with frequency from a few hundred of kilohertz to a few megahertz which is mainly determined by the applied magnetic intensity in NPRO. Frequency-shifted LFI is thus constructed in NPRO without using acousto-optic modulators as mostly used in conventional LFI. A theoretical model is established to well describe the phenomenon. In the end, micro-vibrational measurements are demonstrated to prove the potential application, where vibration-detection amplitude limit below 30 pm, vibration-detection frequency range from a few kilohertz to a few hundred kilohertz is achieved. Benefiting from the characteristics of tin

Author

Zhu, Rong; Gong, Xuezhen; Li, Wenxun; Zhou, Ghuobin; Fan, Weitong; Liu, Danqing; Ma, Chunzhao; Xu, Jie; Guo, Changlei; Yeh, Hsien-Chi

Published

2024

Language

EN