Polarization oscillations of coupled laser beams in an optically pumped atomic vapour
نویسنده
چکیده
Spontaneous polarization oscillations are observed to develop in two laser beams interacting in an atomic vapour when their polarizations are locked to each other. In a theoretical analysis of the situation, we show tha~ these oscillations are due to groundstate magnetization undergoing Larmor precession. The gain of the feedback loop that locks (he two polarizations acts as a control parameter that can cause a phase-transition of the combined system (atoms and laser beam~) into a stable limit cycle.
منابع مشابه
Effect of light Polarization on the absorption index of alkali metal vapor in optical pumping phenomenon
Recently atomic magnetometers are one of the best tools in biomagnetic measurement such as magnetic field of brain and heart. In this paper, the technology of optically pumped atomic magnetometer based on circularly polarized light absorption pumping is described. We have been investigated a new method for measuring polarization effect in an alkali vapor based on polarized light transmission. I...
متن کاملOptically pumped alkali magnetometers for biomedical applications
20 Optically pumped atomic magnetometers measure the Larmor frequency νL at which the bulk magnetization of a spin-polarized alkali metal vapour in a glass cell precesses around the field of interest B0. !e precession frequency is related to the modulus of the magnetic field by νL=(γ/2π)|B0|, where γ/2π≈3.5Hz/nT for 133Cs, so that the magnetic field measurement consists in a frequency measureme...
متن کاملCylindrical vector beams for rapid polarization-dependent measurements in atomic systems.
We demonstrate the use of cylindrical vector beams - beams with spatially varying polarization - for detecting and preparing the spin of a warm rubidium vapor in a spatially dependent manner. We show that a modified probe vector beam can serve as an atomic spin analyzer for an optically pumped medium, which spatially modulates absorption of the beam. We also demonstrate space-variant atomic spi...
متن کاملMeasurement of the Earth’s Magnetic Field Vector based on zero field finding algorithm using optically pumped magnetometers
Atomic magnetometers have found widespread applications in precise measurement of the Earth’s magnetic field due to their high sensitivity. In these measurements, various methods have been utilized to compensate the Earth’s magnetic field in an unshielded environment. In this paper, we have proposed a method based on finding the minimum resonance frequency (corresponding to minimum magnetic fie...
متن کاملAn optically pumped, highly polarized cesium beam for the study of spin-dependent electron scattering
We have set up an atomic beam of cesium for the study of spin-dependent electron-cesium scattering. The beam is produced by an effusive oven with continuous recirculation of the condensed metal. The beam is optically pumped by circularly polarized light from two laser diodes tuned to the 6 2 S1/2 (F -3) 6 21P3/2 (F' = 4) and 6 2 Sl/2 (F = 4) --, 6 2 P3/2 (F' = 5) transitions, respectively. Near...
متن کامل