Abstract
This work proposes an algorithm for the auto-relock of an ultra-stable laser, considering the potential issues of losing lock during long-term operation due to shocks to the system and frequency drifts. We adopt a method of re-searching the lock point to address the lost lock induced by the shocks, where the test of auto-relock with a 100% success rate is carried 1690 times. The median time and the shortest time of auto-relock are 0.62 s and 0.08 s, respectively. To address the issue of lost lock caused by long-term drifts of the optical reference cavity and laser source, we employ a pre-corrective auto-relock method that relies on the output signals of the servo system. The test is carried 4100 times, in which the median time is about 0.2 s. A comparison of two similar ultra-stable lasers shows that the fractional instability frequency is about 5.84 × 10-15 at 1 s averaging time and the linewidth is approximately 1.5 Hz. This work presents an algorithm for auto-relock in ultra-stable lasers. The algorithm has potential benefits for the development of optical clocks and fiber-optic frequency transmission.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
