Infrared laser threshold magnetometry with a NV doped diamond intracavity etalon

Abstract

We propose an hybrid laser system consisting of a semiconductor external cavity laser associated to an intra-cavity diamond etalon doped with nitrogen-vacancy color centers. We consider laser emission tuned to the infrared absorption line that is enhanced under the magnetic field dependent nitrogen-vacancy electron spin resonance and show that this architecture leads to a compact solid-state magnetometer that can be operated at room-temperature. The sensitivity to the magnetic field limited by the photon shot-noise of the output laser beam is estimated to be around 250 fT/ √ Hz. Unlike usual NV center infrared magnetometry, this method would not require an external frequency stabilized laser. Since the proposed system relies on the competition between the laser threshold and an intracavity absorption, such laser-based optical sensor could be easily adapted to a broad variety of physical systems.

Amplification by stimulated emission of nitrogen-vacancy centres in a diamond-loaded fibre cavity

“…through excitedstate absorption, which is not separately considered in our model. Also, in our experiment, we do not observe any saturation of the spontaneous emission from the NV centres, and so we consider a lower value of the absorption cross section for the green available in the literature from Wee et al [38] and Dumeige et al [39]. The ratio of the ionisation or recombination cross section to the absorption cross section (stimulated emission cross section) for the green wavelength (red seed wavelength) was considered from the study by Hacquebard and Childress [22].…”

Optimization of a Diamond Nitrogen Vacancy Centre Magnetometer for Sensing of Biological Signals

“…This includes experiments using an optical cavity and infrared or green absorption [41,42] or the very recent work by Fescenko et al [43] promising sub-pT/ √ Hz sensitivity using flux concentrators. Novel techniques at an early stage, such as laser threshold magnetometry [44,45] also appear promising. Such laser threshold experiments can potentially work with other materials beyond diamond, avoiding the problem of the large shot noise background from spin triplet fluorescence emission.…”

Nanoscale sensing based on nitrogen vacancy centers in single crystal diamond and nanodiamonds: achievements and challenges

“…Combining the previously mentioned approaches, Ref. [116] presents a hybrid laser threshold magnetometer. The laser gain is supplied by an external laser material lasing at the 1 E→ 1 A 1 transitions wavelength.…”