The Working Foundation and Practical Application of Different Optical Lock-In Amplification

DOI

10.2991/978-94-6463-864-6_77How to use a DOI?

Keywords

Optical Lock-In Amplification; Phase-Locked Loops; Correlation Method; Noise Reduction

Abstract

Optical lock-in amplification is a cornerstone technology for extracting weak optical signals buried in noise by leveraging phase-sensitive detection and frequency-domain filtering. This review systematically analyses the mathematical foundations of Optical Lock-in Amplification, including signal modulation, phase-sensitive demodulation, and noise suppression mechanisms. In order to keep up with the cutting-edge developments of the optical lock-in amplification techniques, this work demonstrates two difference paths of the amplification methods: the traditional amplificated method and the correlative method, with the basic mathematical principles of removing noise, screening and retaining the target signals. The following work integrates advances in digital phase-locked loops (PLLs), hybrid optoelectronic systems, The tunable diode laser absorption spectroscopy (TDLAS) and applications in University Physics Laboratories, quantum optics and biomedical imaging. Supported by the real-world applications, this work provides a rigorous theoretical framework of the Optical lock-in amplification itself, exhibit the practical value of this technology in multiple engineering fields, and highlights future directions for Optical lock-in amplification’s development.

Copyright

© 2025 The Author(s)

Open Access

Open Access This chapter is licensed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License (http://creativecommons.org/licenses/by-nc/4.0/), which permits any noncommercial use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license and indicate if changes were made.

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TY  - CONF
AU  - Qiwei He
PY  - 2025
DA  - 2025/10/23
TI  - The Working Foundation and Practical Application of Different Optical Lock-In Amplification
BT  - Proceedings of the 2025 2nd International Conference on Electrical Engineering and Intelligent Control (EEIC 2025)
PB  - Atlantis Press
SP  - 886
EP  - 895
SN  - 2352-5401
UR  - https://doi.org/10.2991/978-94-6463-864-6_77
DO  - 10.2991/978-94-6463-864-6_77
ID  - He2025
ER  -