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Continuous tuning of the laser frequency over 4GHz allows for the clear resolution of the Doppler-free spectral features and allows accurate measurement of the hyperfine ground-state splitting. A direct comparison between Doppler-broadened and Doppler-free spectral features is possible because both are distinctly evident in the two-photon spectra. By independently modifying the polarization state of the two laser fields, the impact of electric dipole selection rules on the two-photon transition spectra is investigated. This experiment is a valuable addition to the advanced undergraduate laboratory because it uses much of the same equipment as the single-photon saturated absorption spectroscopy experiment performed on the 5S1/2→5P3/2 transition in rubidium(λ=780.24nm) and provides students with an opportunity to investigate characteristics of atomic spectra not evident in the single-photon experiment."},{"label":"DOI","value":"10.1119/1.2173278"},{"label":"Volume","value":"74"},{"label":"Issue","value":"3"},{"label":"Publication Date","value":"D:00 M:03 Y:2006"},{"label":"Publication Information","value":"© 2006 American Association of Physics Teachers"}],"description":"Two-photon spectroscopy of rubidium using a grating-feedback diode laser","sequences":[{"@type":"sc:Sequence","canvases":[{"@id":"https://iiif.quartexcollections.com/portland/iiif/11297713-2708-4c46-bcba-2fadc451d012/canvas/_1","@type":"sc:Canvas","label":"Two-photon spectroscopy of rubidium using a grating-feedback 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