Analog plus digital phase and frequency detector for phase locking of diode lasers

Year: 2005

Authors: Cacciapuoti L., De Angelis M., Fattori M., Lamporesi G., Petelski T., Prevedelli M., Stuhler J., Tino G.M.

Autors Affiliation: ESA Research and Scientific Support Department, ESTEC, Keplerlaan 1-P.O. Box 299, 2200 AG Noordwijk ZH, The Netherlands;
Istituto di Cibernetica, C.N.R., 80078 Pozzuoli (NA), Italy;
Dipartimento di Fisica, Università di Firenze and INFN, Sezione di Firenze, 50019 Sesto Fiorentino (FI), Italy;
Dipartimento di Chimica Fisica e Inorganica, Università di Bologna, 40136 Bologna, Italy;
Physikalisches Institut, Universität Stuttgart, 70550 Stuttgart, Germany

Abstract: We describe a type of phase and frequency detector employing both an analog phase detector and a digital phase and frequency detector. The analog and digital detectors are mutually exclusive so that only one of them is active at any given time, resulting in a phase detector with both the broad capture range of digital circuits and the high speed and low noise of analog mixers. The detector has been used for phase locking the diode lasers generating the sequence of Raman pulses in an atom interferometer. The rms phase error of the phase lock is about 100 mrad in a 5 Hz-10 MHz bandwidth. The limit set on the interferometer phase resolution by the residual phase noise is 1.1 mrad. Since the digital circuitry is implemented with a programmable logic device the detector can be easily adapted to other experiments requiring frequency/phase stabilization of lasers sources. © 2005 American Institute of Physics.

Journal/Review: REVIEW OF SCIENTIFIC INSTRUMENTS

Volume: 76 (5)      Pages from: 053111-1  to: 053111-7

KeyWords: laser locking; phase locking;
DOI: 10.1063/1.1914785

Citations: 48
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