We used a tunable cw dye laser to observe Doppler-free two-photon transitions to alkali-atom Rydberg levels. Real-time signals were obtained in an ionization cell of appropriate construction. The two-photon transition wavelengths to rubidium s levels were measured up to n = 50 with better than 1 × 10−7 absolute accuracy and can be represented to within the experimental precision by a simple function of the principal quantum number. Other related transitions and future possibilities are considered.
© 1978 Optical Society of America
Original Manuscript: June 19, 1978
Published: October 1, 1978
S. A. Lee, B. P. Stoicheff, J. Helmcke, and J. L. Hall, "Doppler-free two-photon transitions to Rydberg levels: convenient, useful, and precise reference wavelengths for dye lasers," Opt. Lett. 3, 141-143 (1978)