What question did this study set out to answer?

This research aims to measure Doppler-free absorption and dispersion signals using frequency-modulation spectroscopy in rubidium isotopes.

January 1, 1983Optics Letters

Continuous-wave Doppler-free two-photon frequency-modulation spectroscopy in Rb vapor

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Experimental study measures two-photon transitions and isotope shifts in rubidium isotopes, indicating separation of energy levels.

This research aims to measure Doppler-free absorption and dispersion signals using frequency-modulation spectroscopy in rubidium isotopes.
Employed frequency-modulation spectroscopy to analyze two-photon transitions in (85)Rb and (87)Rb.
Measured the two-photon cross section for specific hyperfine transitions.
Determined the transition isotope shift between the two rubidium isotopes.
Measured two-photon cross section for (87)Rb hyperfine transition as sigma(2) = 4 x 10(-20) cm(4)/W.
Identified transition isotope shift (TIS) as Delta nu(TIS) = +166 +/- 2 MHz between (87)Rb and (85)Rb.

Zapka et al. (1983) studied this question.

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