In this paper, we extend our recent work on cesium S and D states [P. Shen et al., Phys. Rev. Lett. 133, 233005 (2024)] to the F states. We present absolute frequency measurements of the |6S1/2, F = 3 > -> nF5/2,7/2(n = 28-68) Rydberg series to measure the spectrum of 133Cs. Atomic spectra are obtained using a three-photon excitation scheme referenced to an optical frequency comb in a sample of ultracold 133Cs. By globally fitting the absolute-frequency measurements to the modified Ritz formula, we determine the quantum defects of the nF5/2 and nF7/2 series. The ionization potential extracted for both series from the modified Ritz formula agrees with our measurements based on the S and D series. Fine-structure intervals are calculated and parameterized. The wave functions computed for the energies from the quantum defects are used to calculate transition dipole moments. We compare the reduced electric-dipole matrix elements with available benchmarks and find agreement within the precision of those works. The scalar and tensor polarizabilities of the nS1/2, nPJ, nDJ, and nFJ series are calculated based on the now more accurate set of wave functions. Moreover, we report the polarizability as a series in powers of the effective principal quantum number and find the main coefficients of the expansion. The results will be useful for calculating properties of 133Cs such as collision and decay rates, polarizabilities, and magic wavelengths.

In this talk, we present work on a colinear three-photon approach to all-optical, atom-based electric field sensing. Atom-based radio frequency field sensors have a number of applications in communications, radar and test and measurement. All of these applications benefit from being able to improve accuracy and sensitivity. Our three-photon approach eliminates Doppler broadening, improving sensitivity and spectral resolution. Increasing spectral resolution extends the Autler-Townes region where the sensing is self-calibrated. Using a colinear three-photon configuration for preparation and readout, we present results where we obtain an $\sim 20$ times improvement in spectral resolution and $\sim 10$ times improvement in sensitivity when compared to the conventional two-photon preparation and readout. Wel address further avenues for improving sensitivity in the talk, including novel types of vapor cells.