Efficient long-term laser excitation of a collimated beam of potassium atoms on the D2 line
Fachbereich Physik, Universität Kaiserslautern, 67653 Kaiserslautern, Germany
2 Dipartimento di Fisica Enrico Fermi, Via Buonarotti 2, 56127 Pisa, Italy
Published online: 29 June 2004
With the aim to provide a reliable scheme for efficient laser excitation of the potassium D2 line over long periods of time, we have developed a robust stabilization of a single mode laser of frequency onto a crossover peak in the saturation spectrum of the 39K(D2) line (4s 2SP. The two hyperfine transitions (frequency and (frequency are simultaneously excited by the first order sidebands of the laser beam (f0), generated by its electro-optical modulation at the frequency . In this way stable excitation of the two transitions on their proper frequencies is achieved and hyperfine pumping compensated.
PACS: 39.30.+w – Spectroscopic techniques / 32.80.Bx – Level crossing and optical pumping / 42.60.Fc – Modulation, tuning, and mode locking
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2004