Abstract

A five-year record of the lockpoint frequency of a Zeeman stabilized laser shows an observed drift rate of 0.3 ± 0.5 MHz/yr following an initial drift of 5.7 ± 2.2 MHz/yr in the first eighteen months of intermittent operation. A second Zeeman laser drifted at a rate of −0.8 ± 1.0 MHz/yr over the last 2.5 yr; the frequency drift was −0.2 ± 0.6 MHz/yr over the last 3.3 yr. Empirical temperature corrections to laser frequency measurements produce a slight variance reduction in the data but no effective bias in the drift estimates.

© 1989 Optical Society of America

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References

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  1. L. S. Cutler, Official Gazette of the U.S. Patent Office 879,631, Pat. 3,534,292 (1970).
  2. T. Baer, F. V. Kowalski, J. L. Hall, “Frequency Stabilization of a 0.633-μm He–Ne Longitudinal Zeeman Laser,” Appl. Opt. 19, 3173 (1980).
    [Crossref] [PubMed]
  3. M. A. Zumberge, “Frequency Stability of a Zeeman-Stabilized Laser,” Appl. Opt. 24, 1902 (1985).
    [Crossref] [PubMed]
  4. D. C. Agnew, “Strainmeters and Tiltmeters,” Rev. Geophys. 24, 579 (1986).
    [Crossref]
  5. Frequency values plotted in Ref. 3 differ from those given here due to a lack of temperature corrections in the former.

1986 (1)

D. C. Agnew, “Strainmeters and Tiltmeters,” Rev. Geophys. 24, 579 (1986).
[Crossref]

1985 (1)

1980 (1)

Appl. Opt. (2)

Rev. Geophys. (1)

D. C. Agnew, “Strainmeters and Tiltmeters,” Rev. Geophys. 24, 579 (1986).
[Crossref]

Other (2)

Frequency values plotted in Ref. 3 differ from those given here due to a lack of temperature corrections in the former.

L. S. Cutler, Official Gazette of the U.S. Patent Office 879,631, Pat. 3,534,292 (1970).

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Figures (1)

Fig. 1
Fig. 1

Frequency of two Zeeman stabilized lasers corrected for temperature. Open circles denote frequency measurements made with temperature estimates for S/N 1. Filled circles denote frequency measurements of S/N 1 with known temperatures. Filled triangles denote data taken for S/N 2.

Tables (1)

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Table I Tabulated Data Presented in Fig. 1. Zeeman Stabilized Laser Observed and Temperature Corrected Frequencies

Equations (4)

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f ( T a , T z ) = f 0 + ( α β T a ) ( T z 40 ° C ) ,
f 0 = 473 , 612 , 223.0 MHz , α = 0 . 512 MHz°C 1 , β = 0.00496 MHz°C 2 .
f ( T a = 20 °C, T z ) = f 0 + A ( T z 40 °C ) ,
f 0 = 473 , 612 , 209.8 MHz , A = 0.59 ± 0.02 MHz/°C .

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