Saturated-absorption spectroscopy: eliminating crossover resonances by use of copropagating beams |
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Authors: | Banerjee Ayan Natarajan Vasant |
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Institution: | Deportment of Physics, Indian Institute of Science, Bangalore, 560 012, India. |
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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 D2 line of 85Rb with a precision of 70 kHz and to resolve hyperfine levels in the D2 line of 39K that are less than 10 MHz apart. |
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