excited-state using Saturated Absorption Spectroscopy*

Motivated by testing the performance of a homemade external-cavity diode laser (ECDL) operating at 780 nm, the Saturated Absorption Spectroscopy (SAS) was performed to measure the hyperfine energy splittings of rubidium 5P_3/2 excited state. Any nonlinearities associated with ECDL scans were removed by using a low-expansion confocal Fabry-Perot cavity and hence created a linearized frequency axis for the spectra collected in a fully automated fashion. Our results will be compared with the previous measurements reported in the literature.