Abstract

The red side (lower-frequency) mode of a two-mode stabilized 633-nm He–Ne laser has been locked to the hyperfine structure of the P(33) line of ¹²⁷I₂ by means of frequency modulation spectroscopy enhanced by an external optical cavity. Both the red side and blue side (higher-frequency) modes of the laser exhibit a frequency stability of 2.3 × 10^-11 τ^-1/2. In addition, the frequency fluctuations of the blue side mode are detected by a Fabry–Perot cavity and compensated through an acousto-optic frequency shifter. The short-term stability of better than 3 × 10^-11 is attained for integration times of between 2 × 10^-3 and 2 × 10^-1 s.

© 1998 Optical Society of America

Stability, Reproducibility, and Absolute Wavelength of a 633-nm He–Ne Laser Stabilized to an Iodine Hyperfine Component

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