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Quantum Electronics and Laser Science Conference

Experimental study of Stokes fields linewidth in resonant four-wave mixing in hot Rb vapor

Eugeniy E. Mikhailov, Yuri V. Rostovtsev, George R. Welch

Published Jun 25, 2003• 0 citations
Publisher

Abstract

Summary form only given. Studying of /sup 87/Rb vapour Stokes harmonics properties, such as resonance width and dependence on drive laser power, is the subject of this paper. Two external cavity semiconductor lasers were used, as a strong driving laser and as a probe.
DOI
10.1109/qels.2002.1031229

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We present a theoretical study of the four-wave mixing (FWM) spectra of 5 S 1/2 − 5 P 3/2 − 5 D 5/2 ladder-type transitions of 87 Rb atoms. The density matrix equations are solved by considering all the magnetic sublevels to calculate the FWM signals in the atomic vapor cell. These results are subsequently compared with the experimental results. We observe that the FWM signal propagating exactly opposite to the driving field is measured experimentally. Additionally, we demonstrate the effects of optical depth, laser linewidths, and the coupling field power on the FWM spectra. Finally, the origin of the dispersive-like FWM signal is investigated by intentionally varying the intrinsic atomic properties.
Light entanglement holds the potential for quantum telecommunication and quan- tum computing. The goal of the project is to produce a pair of polarization-entangled light fields using Four Wave Mixing (FWM) in hot Rb vapor. In this process interaction of atoms with near-resonant strong control optical field results in strong amplification of a probe optical field and in generation of a quantum correlated conjugate Stokes opti- cal field. The optimum parameters for FWM have been established. Through analysis of the noise, the RF settings allowing for experimental quantum noise to match the shot noise has been confirmed as well. After establishing the shot noise limit, there were many trials to achieve noise lower than the shot noise. To further improve the noise and thus establish the quantum correlation between our fields, we switched from a single laser to a double laser setup. In the future, the quantum correlation between the Stokes field and the probe field will be further improved to allow for the entangled Bell states creation.
We present a study of the spectral linewidth of collimated blue light (CBL) that results from wave mixing of low-power cw laser radiation at 780 nm and 776 nm in Rb vapours. Using a high-finesse Fabry-Perot interferometer the spectral width of the CBL is found to be less than 1.3 MHz for a wide range of our experimental conditions. We also demonstrate that the measured linewidth is mainly limited by the temporal coherence of the applied laser fields rather than laser light intensities and the atomic medium itself.
We investigate frequency up-conversion of low power cw resonant radiation in Rb vapour as a function of various experimental parameters. We present evidence that the process of four wave mixing is responsible for unidirectional blue light generation and that the phase matching conditions along a light-induced waveguide determine the direction and divergence of the blue light. Velocity-selective excitation to the 5D level via step-wise and two-photon processes results in a Doppler-free dependence on the frequency detuning of the applied laser fields from the respective dipole-allowed transitions. Possible schemes for ultraviolet generation are discussed.