Enhancing the bandwidth of gravitational-wave detectors with unstable optomechanical filters

Haixing Miao, Yiqiu Ma, Chunnong Zhao, Yanbei Chen

Research output: Contribution to journalArticlepeer-review

44 Citations (Scopus)


Advanced interferometric gravitational-wave detectors use optical cavities to resonantly enhance their shot-noise-limited sensitivity. Because of positive dispersion of these cavities—signals at different frequencies pick up different phases, there is a tradeoff between the detector bandwidth and peak sensitivity, which is a universal feature for quantum measurement devices having resonant cavities. We consider embedding an active unstable filter inside the interferometer to compensate the phase, and using feedback control to stabilize the entire system. We show that this scheme in principle can enhance the bandwidth without sacrificing the peak sensitivity. However, the unstable filter under our current consideration is a cavity-assisted optomechanical device operating in the instability regime, and the thermal fluctuation of the mechanical oscillator puts a very stringent requirement on the environmental temperature and the mechanical quality factor.
Original languageEnglish
Article number211104
Number of pages5
JournalPhysical Review Letters
Issue number21
Publication statusPublished - 17 Nov 2015


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