Article

Applied Physics B

, Volume 88, Issue 1, pp 21-28

First online:

A simple scheme for precise relative frequency stabilization of lasers

  • N. StraußAffiliated withInstitut für Experimentalphysik, Heinrich-Heine-Universität Düsseldorf
  • , I. ErnstingAffiliated withInstitut für Experimentalphysik, Heinrich-Heine-Universität Düsseldorf
  • , S. SchillerAffiliated withInstitut für Experimentalphysik, Heinrich-Heine-Universität Düsseldorf
  • , A. WichtAffiliated withInstitut für Experimentalphysik, Heinrich-Heine-Universität Düsseldorf Email author 
  • , P. HukeAffiliated withInstitut für Gravitationsphysik, Leibniz Universität Hannover
  • , R.-H. RinkleffAffiliated withInstitut für Gravitationsphysik, Leibniz Universität Hannover

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Abstract

We present a simple scheme for tuneable relative frequency stabilization of lasers. A highly sensitive and accurate frequency-to-voltage converter is used to derive an error signal from the beat note between two lasers. We analyze in detail detector noise and drift, modulation detection bandwidth, and cross-talk from power modulation. The results indicate that sub-kHz relative linewidth and a locking point drift on the order of 100 Hz for times scales of 1 h are achievable. The scheme can, therefore, be applied to situations where up to now only optical PLLs could provide sufficient accuracy and precision. To demonstrate its potential for high-resolution, high-precision spectroscopy we lock a diode laser to a fs-frequency comb and find a relative linear drift of 314 Hz during a 2.8 h period.