Spin-exchange-relaxation-free magnetometry with Cs vapor

Ledbetter, Michael T.; Savukov, Igor; Acosta, Víctor M.; Budker, Dmitry; Romalis, Michael

doi:10.1103/physreva.77.033408

Cited by 322 publications

(195 citation statements)

References 26 publications

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“…Atomic magnetometry was the focus of my rst three years of graduate research [31,32,33,34,35,36], and provided the foundation for the present work. However, there are areas where the existing technologies and approaches nd their limits.…”

Section: Introductionmentioning

confidence: 99%

Optical magnetometry with nitrogen-vacancy centers in diamond

Acosta¹

2013

Optical Magnetometry

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Precision measurement of magnetic elds is at the heart of many important analytic techniques in materials, geology, biology, medicine, security, space, and the physical sciences. These applications require operation under a wide range of specications regarding sensitivity, spatial resolution, bandwidth, scalability, and temperature. In this work we have developed the enabling technology for magnetometers based on nitrogen-vacancy (NV) defects in diamond which promise to cover a wider portion of this parameter space than existing sensors. We have studied how to prepare diamond material optimized for magnetometry, and we observed the basic optical and spin properties of the NV centers. Using a novel scheme inspired by new information about NV centers gathered from these studies, we constructed a sensor which improved on the state-of-the-art in a number of areas. Finally, we outline a plan for improving these sensors to study micro-and nano-scale magnetic phenomena currently inaccessible using existing technology.

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Section: Introductionmentioning

confidence: 99%

Optical magnetometry with nitrogen-vacancy centers in diamond

Acosta¹

2013

Optical Magnetometry

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“…The polarization rotation signal with this autonomous frequency stabilized laser is shown as the magnetic field is scanned across the zero field. The illustrated magnetic field resonance is originated from the Zeeman coherence in degenerate two level systems [6,8,[13][14][15]. The linearly polarized light in sigma configuration can be viewed as a combination of σ + and σ -component, when its interaction with an atomic system is envisaged.…”

Section: Figure-2: the Reflected Signals By The Analyzer As A Functiomentioning

confidence: 99%

An atomic magnetometer with autonomous frequency stabilization and large dynamic range

Pradhan

Mishra

Behera

et al. 2015

Review of Scientific Instruments

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The operation of a high sensitive atomic magnetometer using resonant elliptically polarized light is demonstrated. The experimental geometry allows autonomous frequency stabilization of the laser, thereby offers compact operation of the overall device. The magnetometry is based on measurement of the zero magnetic field resonance in degenerate two level system using polarimetric detection and has a preliminary sensitivity of <10 pT/Hz 1/2 @ 1 Hz. The requirements for these specialized applications are very specific in terms of sensitivity, dynamic range, and sizes. For example, the biomedical application desires miniaturized sensor head where as overall size & weight of the device is of paramount importance for space application. For either biomedical or space application, the all optical magnetometer has an edge over RF magnetometer [5] due to possible reduction in sizes.The all optical magnetometer has two variant, one operating on degenerate two level systems and the other relying on quantum interference among distinct hyperfine levels. The measurement based on degenerate two level systems primarily operates as NMOR (non-linear magnetooptic rotation) or SERF (spin exchange relaxation free) magnetometer [6,7]. The preparation of the atomic system for these two techniques are different, however relies on similar detection scheme. Recently, Shah and Romalis have circumvented the requirement of the additional pump beam in the orthogonal direction to the probe beam for the operation of the SERF magnetometer by the use of an elliptically polarized light without compromising much on the sensitivity [8]. This magnetometer was operated at ~45 GHz away from the atomic resonance and the elliptically polarized light does the dual job of spin polarization and measurement of the magnetic field.The all optical magnetometer working on quantum interference between hyperfine states can be operated either in high field regime, where the separation between the coherent population trapping (CPT) states is a measure of magnetic field or in the low field regime utilizing the separation between the convoluted transmission and polarization rotation signal arising due to quantum interference [9][10][11][12]. The later techniques provide a unique possibility of simultaneous operation of atomic clock and atomic magnetometer apart from operational flexibility for magnetometry [12].Here we have envisaged a new experimental geometry for measurement of the magnetic field utilizing zero magnetic field resonance of the degenerate two level systems. It is based on the analyzer parallel to the polarizer configuration against conventional 45 0 among them as has been utilized for either NMOR or SERF magnetometer. We use conventional frequency modulation spectroscopy to improve the signal to noise ratio. The schematic experimental set-up is shown in Fig.-

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“…The sensitivity of Cs SERF magnetometer has been measured in Ref. (Ledbetter et al, 2008a), and the advantage of low temperature was used for the detection of NMR in a microfluidic channel with a Cs SERF based on a microfabricated cell in Ref. (Ledbetter et al, 2008).…”

Section: Spin-exchange Free Atomic Magnetometermentioning

confidence: 99%

Ultra-Sensitive Optical Atomic Magnetometers and Their Applications

Savukov¹

2010

Advances in Optical and Photonic Devices

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Spin-exchange-relaxation-free magnetometry with Cs vapor

Cited by 322 publications

References 26 publications

Optical magnetometry with nitrogen-vacancy centers in diamond

Optical magnetometry with nitrogen-vacancy centers in diamond

An atomic magnetometer with autonomous frequency stabilization and large dynamic range

Ultra-Sensitive Optical Atomic Magnetometers and Their Applications

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