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We report observation of the $\rm 5S_{1/2} \rightarrow 5D_{5/2}$ two-photontransition in Rb vapor at 778 nm, using an external cavity diode laser systemand a heated vapor cell. The spectra in the two isotopes show well-resolvedhyperfine transitions. The peaks are Doppler free, and have a Lorentzianlineshape with a typical linewidth of 2.2 MHz. This linewidth is larger thanthe natural linewidth of 300 kHz, but is still 5--10 times smaller than thelinewidth for single-photon transitions in the D$_2$ line. Since the absolutefrequency of this transition is measured with 8 kHz precision, it can form abetter secondary reference in the optical regime compared to the D$_2$ line.

Accessing the $\rm 5S_{1/2} \rightarrow 5D_{5/2}$ two-photon transition in Rb using a diode laser system