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Journal of Huizhou University

A New Pumping Source for Optical Pumping Resonance Experiments

Fan Sun

Published Jan 1, 2002• 0 citations
OpenAlex

Abstract

Introduce a new pumping source for optical pumping magnetic resonance experiment.The pumping source is with the characteristic of high stable?adjustable easy modulated and multi wavelength.An application for the source to be used in observation of atom transition is also introduced.

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American Journal of Physics•Apr 1, 1966•34 citations
4^44He (2 3^33S1_11​) metastable atoms are optically pumped with intensity modulated light. The use of a single mode diode-pumped LNA laser as the pumping source, allows the study of resonance signals predicted by the optical pumping theory but not yet observed. Resonances are detected on the transmitted pumping beam at the modulation frequency and its harmonics. Application of this method to high sensitivity magnetometers is suggested.
Recently a distributed Bragg reflection (DBR) laser diode was commercialised by SDL (USA) for helium optical pumping experiments. An interesting feature of the new device is the possibility of frequency modulation of the diode output by modulating the current intensity, leading to a new pumping scheme called optical pumping with frequency modulated light. We develop this method to induce spin precession and obtain new resonances in 4He atomic gas, simply by modulating the frequency of the pumping light at the Larmor frequency of atomic states in a static magnetic field. These resonances are analysed with a simple model taking into account velocity changing collisions.
We propose and report the first experimental demonstration of a new type of active optical bistable device composed of an optical cavity and a lasing medium with a pumping source of either optical or nonopticai means. The basic principle underlying the operation of the optical bistable laser (OBL) is based on the stable-unstable cavity configuration transition of an active optical resonator. Generally speaking, a laser system showing both pump- and laser-induced tensing (focusing or defocusing) effects may display such a hysteresis loop in its input-output characteristics. Optical bistability (OB) based on self-focusing of light in a medium having a nonlinear refractive index has recently been shown experimentally.1
A density matrix description of magnetic resonance is constructed, with detailed application to spin J = 1 (or greater) particles. Different types of “monitoring” or “measurement” operators employed in atomic beam, induction, and optical experiments are constructed, and used as a compact introductory basis for the description of resonance line shapes and other characteristics of these experiments. Of particular interest are the similarities and unique differences between the optical experiments known by the names “optical pumping,” “double resonance,” and “light beats” on the one hand, and magnetic induction and atomic beam experiments on the other.