Laser Frequency Stabilisation for Gravitational Wave Detection

报告题目:Laser Frequency Stabilisation for Gravitational Wave Detection

报告人:Prof. Daniel Shaddock( Australian National University, CEO and Founder of Liqu

报告时间:2023.9.7 (周四) 上午 10:30



In many optical metrology applications, the laser wavelength is the ruler that displacements are measured against. It is difficult to distinguish between changes in the laser wavelength (or frequency) and displacements of the objects to be measured. Gravitational wave detectors have found success in using a multi-layered approach to mitigating laser frequency noise. Common-mode rejection, stabilisation to an optical reference cavity, arm locking and time-delay interferometry are used in combination in ground-based or space-based gravitational wave detection.

The presentation will give and intuitive explanation of some of these techniques describing how and when they should be implemented. It will also discuss how software-defined instrumentation can help to make these techniques more accessible to scientists and engineers.


Daniel Shaddock is a professor in Physics at the Australian National University. His research focuses on precision measurements using advanced digital signal processing. Prof Shaddock led Australia’s involvement in Grace Follow-on, a satellite mission launched on May 22, 2018 to track the Earth’s water movement. Prior to this work Daniel was a Director’s Fellow at NASA’s JPL where he served as NASA’s interferometer Architect for the LISA mission. He is a Fellow of the American Physical Society and his publications have been cited over 20,000 times. Daniel was a co-author on the paper announcing the observation of gravitational waves, an achievement that was awarded the 2017 Nobel Prize in Physics.