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A comprehensive study of three-photon electromagnetically-inducedtransparency (EIT) and absorption (EIA) on the rubidium cascade $5S_{1/2}\rightarrow 5P_{3/2}$ (laser wavelength 780~nm), $5P_{3/2} \rightarrow5D_{5/2}$ (776~nm), and $5D_{5/2}\rightarrow 28F_{7/2}$ (1260~nm) is performed.The 780-nm probe and 776-nm dressing beams are counter-aligned through a Rbroom-temperature vapor cell, and the 1260-nm coupler beam is co- orcounter-aligned with the probe beam. Several cases of EIT and EIA, measuredover a range of detunings of the 776-nm beam, are studied. The observedphenomena are modeled by numerically solving the Lindblad equation, and theresults are interpreted in terms of the probe-beam absorption behavior ofvelocity- and detuning-dependent dressed states. To explore the utility ofthree-photon Rydberg EIA/EIT for microwave electric-field diagnostics, asub-THz field generated by a signal source and a frequency quadrupler isapplied to the Rb cell. The 100.633-GHz field resonantly drives the$28F_{7/2}\leftrightarrow29D_{5/2}$ transition and causes Autler-Townessplittings in the Rydberg EIA/EIT spectra, which are measured and employed tocharacterize the performance of the microwave quadrupler.

Electromagnetically-induced transparency, absorption, and microwave field sensing in a Rb vapor cell with a three-color all-infrared laser system