Guided lock of a suspended optical cavity enhanced by a higher-order extrapolation
Lock acquisition of a suspended optical cavity can be a highly stochastic process and is therefore nontrivial. Guided lock is a method to make lock acquisition less stochastic by decelerating the motion of the cavity length based on an extrapolation of the motion from an instantaneous velocity measurement. We propose an improved scheme that is less susceptible to seismic disturbances by incorporating the acceleration as a higher-order correction in the extrapolation. We implemented the new scheme in a 300-m suspended Fabry–Perot cavity and improved the success rate of lock acquisition by a factor of 30.
© 2017 Optical Society of America. Received 5 April 2017; revised 5 June 2017; accepted 5 June 2017; posted 6 June 2017 (Doc. ID 292098); published 28 June 2017. Funding: Ministry of Education, Culture, Sports, Science and Technology (MEXT) (09NP0801, 415); National Science Foundation (NSF) (PHY-0107417). The authors greatly acknowledge T. Akutsu and S. Dwyer for fruitful discussion, and H. Yamamoto for providing the e2e simulation codes.
Submitted - 1704.01645.pdf
Published - ao-56-19-5470.pdf