The Application of Pound–Drever–Hall Technology in High-Resolution Sensing—A Review

Pound–Drever–Hall (PDH) technology is a frequency stabilization technology, which is widely used in laser frequency stabilization systems. The high-frequency stability in this technology has attracted the attention of sensor researchers. In this article, we review the basic principle of PDH technology and introduce the related improved PDH technology. In view of the wide application of PDH technology in high-resolution sensors in recent years, we will introduce the sensors involved in this technology in detail according to the core optical sensing components and their main features. Furthermore, we summarize the physical quantities suitable for high-resolution sensing using PDH technology. The problems and prospects of PDH in high-resolution sensors are presented at the conclusion to assist researchers in clarifying their research directions. This article presents an in-depth analysis of the current state of research regarding PDH-related high-resolution sensor technologies and makes a prognosis regarding the future direction of the high-resolution sensor, which can improve the sensing performance in many areas.