An optical magnetometer for determining a magnetic field permeating a volume of interest, wherein the volume of interest comprises a medium including a molecular species, wherein the magnetic field is determined by detecting a light beam (112, 114) passing an optical path within the volume of interest, the optical magnetometer comprising: a laser source directed to the volume of interest, wherein the laser source is configured to generate a pumping laser pulse being also a dissociating laser pulse, wherein the optical magnetometer is configured to generate an atomic species by the dissociating laser pulse, wherein the dissociating laser pulse has a laser wavelength tuned for dissociating at least a fraction of the molecular species within the volume of interest into atomic constituents as the atomic species, the pumping laser pulse having a wavelength tuned for pumping the atomic species to an upper electronic state, such that the pumping laser pulse is configured to simultaneously dissociate the molecular species and excite one of the atomic constituents, this excitation being followed by lasing from the excited atomic state via stimulated Raman scattering, wherein the pumping laser pulse is configured to polarize at least a fraction of the atomic species; a detector configured to detect a light beam characterizing quantity of the light beam (112, 114) passing the optical path within the volume of interest, wherein the light beam is generated upon relaxation of the upper electronic state to a lower electronic state of the atomic species in the volume of interest; and an evaluation unit configured to evaluate a magnetic field characterizing quantity of the magnetic field permeating the volume of interest based on the detected light beam characterizing quantity detected by the detector. a laser source directed to the volume of interest, wherein the laser source is configured to generate a pumping laser pulse being also a dissociating laser pulse, wherein the optical magnetometer is configured to generate an atomic species by the dissociating laser pulse, wherein the dissociating laser pulse has a laser wavelength tuned for dissociating at least a fraction of the molecular species within the volume of interest into atomic constituents as the atomic species, the pumping laser pulse having a wavelength tuned for pumping the atomic species to an upper electronic state, such that the pumping laser pulse is configured to simultaneously dissociate the molecular species and excite one of the atomic constituents, this excitation being followed by lasing from the excited atomic state via stimulated Raman scattering, wherein the pumping laser pulse is configured to polarize at least a fraction of the atomic species; a detector configured to detect a light beam characterizing quantity of the light beam (112, 114) passing the optical path within the volume of interest, wherein the light beam is generated upon relaxation of the upper electronic state to a lower electronic state of the atomic species in the volume of interest; and an evaluation unit configured to evaluate a magnetic field characterizing quantity of the magnetic field permeating the volume of interest based on the detected light beam characterizing quantity detected by the detector.