Abstract

Tuning characteristics of power, intramode beat frequency, and polarization of 633-nm internal mirror lasers filled with natural Ne or ²⁰Ne are studied. It is found that the tuning curve of a polarization signal is S-shaped for the natural Ne laser, whereas that of the intramode beat frequency is S-shaped for the ²⁰Ne laser. The characteristic parameters of the tuning curve of the intramode beat frequency are determined. The axial modes of a ³He–²⁰Ne laser are collapsed into one by a transverse magnetic field and frequency stabilized by cooling the laser tube with a fan to keep the intramode beat constant. Frequency fluctuation of 3 × 10⁻¹⁰ is obtained by the Allan variance analysis for the integration period range of 0.1–100 sec. Absolute accuracy and interinstrumental reproducibility of stabilized wavelengths can be expected for a ³He–²⁰Ne transverse Zeeman laser stabilized at the central frequency of the intramode beat.

© 1980 Optical Society of America

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