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Optics Communications

Detection of the Rydberg states of rubidium using a frequency doubled CW dye laser

A. I. Ferguson, Malcolm H. Dunn

Published Nov 1, 1977• 13 citations
Publisher
DOI
10.1016/0030-4018(77)90313-3

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We demonstrate Doppler-free, purely optical detection of laser-excited rubidium Rydberg atoms in a room-temperature gas cell. The Rydberg atoms are excited with a frequency-doubled dye laser at 297 nm in a single-excitation step from the ground state; the detection is performed with a 780 nm diode laser in a scheme similar to electron shelving. Laser spectroscopy of Rydberg transitions is demonstrated, and a frequency-doubled dye is stabilized to one Rydberg transition in the UV. The performance of this stabilization is measured with an atomic-beam apparatus and a time of flight experiment.
We present new experimental data on the highly excited levels in mercury using the optogalvanic detection technique in conjunction with a dc discharge cell. The collisionally populated 6s6p 3P2 metastable level has been used as an intermediate level to access the Rydberg states using a frequency-doubled dye laser covering the wavelength region between 370 and 249 nm. The optogalvanic data reveal 6sns 3S1(13≤n≤50), 6snd 2D1(6≤n≤18), 6snp 3D1(6≤n≤14), 6snd 3D2(6≤n≤15), and 6snd 3D3(6≤n≤59) Rydberg series. The 6sns 3S1 and 6snd 3D3 Rydberg series to such a high n value have been reported for the first time. In addition, collisionally induced parity-forbidden transitions 6snp 3P1(44≤n≤50) have been detected.