Abstract

Based on an efficient (30%), broadband (~3.5-GHz) electro-optic modulator producing rf optical sidebands locked to a stable cavity, we can scan a tunable dye laser under computer control with frequency-synthesizer precision. Cavity drift is suppressed in software by using a strong feature in the spectrum for stabilization. Mercury isotope shifts (546 nm 63P2 → 73S1) have been measured with a reproducibility of ~50 kHz. This accuracy of ~1/300 of the linewidth illustrates the power of the technique. Derived hyperfine-structure constants are compared with previous atomic-beam data where available.

© 1989 Optical Society of America

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