Dual comb interferometry: methodologies, systems and applications

 

Guanhao Wu
State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision
Instrument, Tsinghua University, Beijing 100084, China
guanhaowu@mail.tsinghua.edu.cn

 

Abstract:

Absolute distance measurement is essential for high-accuracy manufacturing and assembling. Dual-comb interferometry is an emerging tool that exploits phase resolution and frequency accuracy for precise and fast distance measurement. Using two coherent frequency combs, dual-comb interferometry allows time and phase response to be measured rapidly. It breaks through the limitations related to the responsive bandwidth, ambiguity range, and dynamic measurement characteristics of conventional ranging tools. In this talk, I will introduce dual-comb interferometry and summarizes the key techniques for realizing this ranging tool. Firstly, I will introduce the principle of dual-comb interferometry, including design of system and parameter optimization, and then discuss the suppression of phase noise of the system. Then, I will introduce the progress in instrumentation development of dual-comb ranging system, and its applications in fields such as space camera deformation and microwave remote sensing antenna baseline measurement. Finally, I will introduce high-precision multi-degree-of-freedom measurement based on dual-comb interferometry.


Short CV:

Guanhao Wu is currently the director of Institute of Opto-electronic Engineering, in the Department of Precision Instrument, Tsinghua University. He received Ph.D degree in optical engineering from Tsinghua University in 2008. He used to be a visiting scholar in National Metrology Institute of Japan (NMIJ) from 2011 to 2012. His research interests include frequency comb, comb-based distance measurement and light detection and ranging (Lidar). In recent years, he has published more than 70 international refereed journal papers, and he is the holder of more than 30 Chinese patents. He won the Special Prize of Chinese Machinery Industry Science and Technology Award in 2020, and won the First Prize of Science and Technology Progress Award of Chinese Society for Measurement in 2021. He is also the winner of Beijing youth science and technology award.