Abstract

We demonstrate a new technique for saturated-absorption spectroscopy by use of copropagating beams that does not have the problem of crossover resonances. The pump beam is locked to a transition, and its absorption signal is monitored while the probe beam is scanned. As the probe comes into resonance with another transition, the pump absorption is reduced and the signal shows a Doppler-free dip. We use this technique to measure hyperfine intervals in the $D_2$ line of ${ }^{85}\mathrm{Rb}$ with a precision of 70 kHz and to resolve hyperfine levels in the $D_2$ line of ${ }^{39}\mathrm{K}$ that are less than 10 MHz apart.

© 2003 Optical Society of America

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