The process of lock acquisition in a high-finesse suspended Fabry–Perot cavity used in the LIGO 40-m interferometer is numerically simulated. The simulation, including a model of the cavity optical transient response as the mirrors swing through resonance, demonstrates that acquisition of lock by the controller depends on the relative velocity of the mirrors and establishes a threshold velocity below which acquisition may take place. The model results are used to implement a real-time controller that analyzes the transient response, extracts the mirror velocity, and then guides the mirrors into resonance with relative velocity under the threshold. The result is a factor-of-10 decrease in the experimentally observed acquisition time.
© 1995 Optical Society of America
Original Manuscript: August 28, 1995
Published: December 15, 1995
Jordan Camp, Lisa Sievers, Rolf Bork, and Jay Heefner, "Guided lock acquisition in a suspended Fabry–Perot cavity," Opt. Lett. 20, 2463-2465 (1995)