High-speed phase-locked-loop frequency control of identical lasers

A. A. Voevoda; A. S. Farnosov; V. A. Zhmud

doi:10.1117/12.484578

29 July 2002 High-speed phase-locked-loop frequency control of identical lasers

A. A. Voevoda, A. S. Farnosov, V. A. Zhmud

Proceedings Volume 4900, Seventh International Symposium on Laser Metrology Applied to Science, Industry, and Everyday Life; (2002) https://doi.org/10.1117/12.484578
Event: Seventh International Symposium on Laser Metrology Applied to Science, Industry, and Everyday Life, 2002, Novosibirsk, Russian Federation

Abstract

Phase-locked frequency control of two identical lasers is used in laser heterodyne systems in order to decrease the frequency with preservation of its absolute stability. It is most important to provide the highest dynamic accuracy. This is achievable with regulators providing ?60dB/dec slope of bode diagram or even a sharper one. As a rule, this value is – 40dB/dec but in absolute frequency measuring researches it is not enough. Another important problem is dividing two modes of transient process in accordance with the two used modulators. A new method for this goal is given with necessary equations and design procedures. The essence of the method is use of two piezoelectric modulators with significantly different bode diagrams in two servo loops. The fast loop is made with a wide bandpass. As a result, the slope of bode diagram of the fast loop is ?20dB/dec because of the contribution of the contribution of the integrator that is given form the transform of the phase value into frequency value. The slope of the loop is made no less than ?40dB/dec, so the resulting slope is much steeper than the slope of the fast loop. Its minimum value is ?60dB/dec. So the transient function of the fast loop is W1=b(1+Tb)-1, and the transient function of the slow loop is W2=Kn(1+GKTp)n, whereK2>>b>>G2>>G>>1 n?[2,3,4…]. The method has been successfully tested in several laser setups. The restrictions of the method are discussed.

Citation Download Citation

A. A. Voevoda, A. S. Farnosov, and V. A. Zhmud "High-speed phase-locked-loop frequency control of identical lasers", Proc. SPIE 4900, Seventh International Symposium on Laser Metrology Applied to Science, Industry, and Everyday Life, (29 July 2002); https://doi.org/10.1117/12.484578

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