Robust offset locking of laser frequency with electronically tunable LC circuits for sub-millihertz uncertainty

Taro Hasegawa, Yuhei Seishu

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Laser frequency stabilization is one of the essential technique in atomic, molecular, and optical physics, quantum optics, optical communications, and fundamental physics. Optical offset locking is the technique to stabilize optical frequency of a single-mode laser (slave laser) with respect to another well-stabilized laser (master laser). Optical phase lock loop (OPLL) [1] is one of the offset locking schemes, with which the slave laser frequency can be stabilized very precisely (less than the uncertainty of 10-18). However, especially in noisy experimental circumstances, the OPLL does not work because its capture range is not so wide that the locking fails for large amount of frequency jitters. In order to keep the locked condition, another offset locking with wider capture range is sometimes required. Examples of such locking schemes are digital processing technique, optical frequency locking to resonance frequency of a high-finesse cavity [2], offset locking with an electrical delay line [3], and offset locking with electric LC resonant circuit [4]. The offset locking with the electric LC circuit (LC locking) has been introduced by W. -Y. Cheng et al, and with employing this scheme with the OPLL the beat-note frequency can be stabilized as precise as one millihertz.

Original languageEnglish
Title of host publicationEuropean Quantum Electronics Conference, EQEC_2019
PublisherOptica Publishing Group (formerly OSA)
ISBN (Print)9781728104690
Publication statusPublished - 2019
EventEuropean Quantum Electronics Conference, EQEC_2019 - Munich, United Kingdom
Duration: 2019 Jun 232019 Jun 27

Publication series

NameOptics InfoBase Conference Papers
VolumePart F143-EQEC 2019
ISSN (Electronic)2162-2701


ConferenceEuropean Quantum Electronics Conference, EQEC_2019
Country/TerritoryUnited Kingdom

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Mechanics of Materials


Dive into the research topics of 'Robust offset locking of laser frequency with electronically tunable LC circuits for sub-millihertz uncertainty'. Together they form a unique fingerprint.

Cite this