Abstract: A vector magnetometer comprises a cell to be filled with an atomic gas, an optical source and a photo-detection device. The optical source is configured to emit towards the cell: a first and a second optical beam, called probe beams, that are polarised linearly, a third optical beam, called the pump beam, linearly polarised. The polarisation directions of the probe beams and the polarisation direction of the pump beam are not coplanar. The photo-detection device is configured to receive light from the probe beams that have passed through the cell. The probe beams can have the same propagation direction. The polarisation direction of the pump beam can form an angle of 45°±10° with the polarisation direction of each of the probe beams.

Abstract: A magnetometer, comprising a cell filled with an atomic gas, an optical source configured to illuminate the cell with a pump beam and a probe beam and a photodetection device arranged so as to receive the light of the probe beam that has passed through the cell and configured to deliver a signal carrying information relating to the state of alignment of the atoms of the atomic gas in the cell. The pump beam is polarised linearly in a polarisation direction and the probe beam is polarised linearly in a polarisation direction forming a non-zero angle with the polarisation direction of the pump beam.

Abstract: A magnetometer that comprises a cell filled with an atomic gas, an optical source and a detector. The source illuminates the cell with a light that has a pump contribution (Fp), that is linearly polarised at least partially and under the effect of which the atoms of the atomic gas undergo an atomic transition, and a probe contribution (Fs), which is linearly polarised and which undergoes variations in polarisation when passing through the cell. The directions of polarisation of the pump contribution and of the probe contribution are collinear orthogonal. The detector takes a differential measurement of the right circular polarisation and of the left circular polarisation of the probe contribution that has passed through the cell.

Abstract: A vector magnetometer comprises a cell to be filled with an atomic gas, an optical source and a photo-detection device. The optical source is configured to emit towards the cell: a first and a second optical beam, called probe beams, that are polarised linearly, a third optical beam, called the pump beam, linearly polarised. The polarisation directions of the probe beams and the polarisation direction of the pump beam are not coplanar. The photo-detection device is configured to receive light from the probe beams that have passed through the cell. The probe beams can have the same propagation direction. The polarisation direction of the pump beam can form an angle of 45°±10° with the polarisation direction of each of the probe beams.

Abstract: The invention relates to the controlling of the wavelength of a laser (2) on an atomic transition. It in particular proposes a method comprising the steps consisting in: emitting a laser beam in the direction of a cell (3) filled with an atomic vapour; carrying out a supply of energy to the atoms of the atomic vapour using a source of energy (4); generating a DAVLL signal (SDAVLL) using the laser beam that has passed through the cell (3); and controlling the wavelength of the laser using the DAVLL signal. According to the invention, the supplying of energy to the atoms of the atomic vapour is modulated to carry out the alternating of a first phase and of a second phase, the first phase supplying more energy than the second phase.

Abstract: The invention relates to the controlling of the wavelength of a laser (2) on an atomic transition. It in particular proposes a method comprising the steps consisting in: emitting a laser beam in the direction of a cell (3) filled with an atomic vapour; carrying out a supply of energy to the atoms of the atomic vapour using a source of energy (4); generating a DAVLL signal (SDAVLL) using the laser beam that has passed through the cell (3); and controlling the wavelength of the laser using the DAVLL signal. According to the invention, the supplying of energy to the atoms of the atomic vapour is modulated to carry out the alternating of a first phase and of a second phase, the first phase supplying more energy than the second phase.