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Acta Optica Sinica

Observation of Zeeman coherences within the ground state of rubidium atoms using pulsed diode laser

Sung-Hoon Yang

Published Jan 1, 1992• 0 citations
OpenAlex

Abstract

Zeeman coherences with Am = 1 and Am=2 are observed in the ground state of natural rubidum vapor optically pumped with a laser diode pulse train. The laser pulse of approximately 200ps at 780 nm are produced by gain-switching through direct modulation of the inject current of the laser. Δm = 1 coherences are detected by a probe beam using the polarization speotrosoopy technique, while the forward scattering spectroscopy technique is used to detect the Δm=2 coherences.

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Japanese Journal of Applied Physics•Jan 1, 1996•13 citations
Zeeman coherences with Am = 1 and Am=2 are observed in the ground state of natural rubidum vapor optically pumped with a laser diode pulse train. The laser pulse of approximately 200ps at 780 nm are produced by gain-switching through direct modulation of the inject current of the laser. Δm = 1 coherences are detected by a probe beam using the polarization speotrosoopy technique, while the forward scattering spectroscopy technique is used to detect the Δm=2 coherences.
Magnetic field and its gradient measurements based on coherent population trapping resonances at the D1 line of 87 Rb are performed by means of coupling two ground-state Zeeman sublevels belonging to different hyperfine levels to a common excited state.Two coherent laser fields with frequency difference of 6.8 GHz are used.They are produced by direct current modulation of a diode laser.The resonance splitting and broadening caused by the applied magnetic field is measured by scanning the laser modulation frequency around the ground-state hyperfine frequency.
Specific types of atomic coherences between Zeeman sublevels can be generated and detected using a method based on nonlinear magneto-optical rotation with frequency-modulated light. Linearly polarized, frequency-modulated light is employed to selectively generate ground-state coherences between Zeeman sublevels for which $\mathrm{\ensuremath{\Delta}}m=2$ and $\mathrm{\ensuremath{\Delta}}m=4$ in 85Rb^{85}\mathrm{Rb}85Rb and 87Rb^{87}\mathrm{Rb}87Rb atoms, and additionally $\mathrm{\ensuremath{\Delta}}m=6$ in 85Rb^{85}\mathrm{Rb}85Rb. The atomic coherences are detected with a separate, unmodulated probe light beam. Separation of the pump and probe beams enables independent investigation of the processes of creation and detection of the atomic coherences. With the present technique the transfer of the Zeeman coherences, including high-order coherences, from excited to ground state by spontaneous emission has been observed.
We observed saturated absorption spectra of the 87Rb atom under a magnetic field of several millitesla with a diode laser oscillating at 780 nm. The spectra were compared with the theoretical ones obtained on the basis of Nakayama's four-level model. We numerically computed Zeeman splittings of the 52 P 3/2 excited state of the atom. As the magnetic field increased to 5 mT, the absorption peak of the F=2→F'=3 transition shifted almost linearly up to about 62 MHz. The shift direction was reversed by changing the polarization combination of the pump and probe lasers. The measured frequency stability, when the laser was locked at the absorption peak, was better than σy(τ)= 1 ×10-11τ-1/2 for the sampling time of 0.01 s≤τ≤10 s.