Spin-exchange relaxation free magnetometry with Cs vapor

Abstract

We describe a Cs atomic magnetometer operating in the spin-exchange relaxation-free (SERF) regime. With a vapor cell temperature of $103^{\circ }\mathrm{C}$ we achieve intrinsic magnetic resonance widths $\Delta B=17\mu \mathrm{G}$ corresponding to an electron spin-relaxation rate of $300{\mathrm{s}}^{-1}$ when the spin-exchange rate is ${\Gamma }_{SE}=14000{\mathrm{s}}^{-1}$. We also observe an interesting narrowing effect due to diffusion. Signal-to-noise measurements yield a sensitivity of about $400pG/\sqrt{\mathrm{Hz}}$. Based on photon shot noise, we project a sensitivity of $40pG/\sqrt{\mathrm{Hz}}$. A theoretical optimization of the magnetometer indicates sensitivities on the order of $2pG/\sqrt{\mathrm{Hz}}$ should be achievable in a $1\mathrm{c}{\mathrm{m}}^3$ volume. Because Cs has a higher saturated vapor pressure than other alkali metals, SERF magnetometers using Cs atoms are particularly attractive in applications requiring lower temperatures.

8 pages, 6 figures. submitted to PRA

References in corpus (1)

• Optical Magnetometry

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