Research on the signal of 4He pump magnetometer sensor using ECDL laser

Abstract

One of the most important factors determines specifications of 4 He optically pumped magnetometer is the quality of resonance signal given by sensor probe. This paper introduces a laser 4 He optically pumped magnetometer using an ECDL laser. An external cavity length tuning system of ECDL laser based on the double light path atom saturated absorption spectrum method with a 4 He cell is build up to ensure that an effective 1083.207 nm laser light source is provided for the magnetometer probe. It is designed a double path photoelectric detector to get the absorption peak signal by the difference technology. Because signal in accordance with Lorentz linear features, a detection method combined with first and second derivative of signal curve is proposed. Join a modulation signal whose form is dc component add sinusoidal component, the system make ECDL laser give a stable output wavelength around 1083.207 nm. With the laser light, a resonance signal with better quality than the 4 He optically pumped magnetometer probe using the gas discharge lamp light source is given.

Research on high sensitivity Mz rubidium laser optically pumped magnetometer

“…The laser optically pumped magnetometer has been paid much attention. Its sensitivity has been greatly improved compared with the traditional light optically pumped magnetometer [3]. Optical pump magnetometer can be divided into rubidium, cesium and helium optical pump magnetometer according to the different core working substances [4][5][6].…”

Multi-Parameter Optimization of Rubidium Laser Optically Pumped Magnetometers with Geomagnetic Field Intensity

“…In recent years, with the development of laser technology, the application of lasers in OPMs has become a focus of attention owing to its good spectral line selectivity and stronger light intensity than spectral lamps. As a key instrument in the field of quantum measurement technology, laser OPMs have a sensitivity that is more than one order of magnitude higher than traditional light OPMs [21,22]. At present, the core materials available for OPMs include He, K, Rb, Cs, Na, and their mixed fillers [18,[23][24][25][26].…”