Automatic system to relock a laser frequency to a Fabry-Perot cavity

Seung Koo Lee, Byoung Woong Han, Donghyun Cho

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

We developed a system that allowed us to unlock and at a later time automatically relock a laser frequency to a medium-finesse Fabry-Perot cavity. The system can work as a chopping wheel or a shutter for a laser field built inside a cavity. The heart of our system is the flywheel circuit for the slower-acting servo loop and the automatic gain control circuit for the faster-acting servo loop. The flywheel circuit stores a correction for a slow frequency drift so that during the unlocked period the slow loop can be safely turned off. The automatic gain control lowers the fast loop gain during a relock process and increases the gain after the lock is secured. The system works reliably at a chopping frequency up to 70 Hz, and relocks well after being unlocked for up to 10 s.

Original languageEnglish
Article number026101
JournalReview of Scientific Instruments
Volume76
Issue number2
DOIs
Publication statusPublished - 2005 Jan 25

ASJC Scopus subject areas

  • Instrumentation
  • Physics and Astronomy (miscellaneous)

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