Investigation of the noise characteristics of vertical-cavity surface-emitting laser with a rhomboidal oxide current aperture for use in a Cs-based compact atomic magnetometer

The possibility of using vertical-emitting lasers with intracavity contacts (IC-VCSEL) and a rhomboidal oxide current aperture for creating non-zero magnetic field optically pumped atomic magnetometers (OPM) 133 Cs vapor cell magnetoencephalographic (MEG) systems were demonstrated. Relative intensity noise (RIN) polarization resolved RIN the IC-VCSEL in 895 nm range different mirror losses (linewidth) frequency from 1 Hz to 100 kHz experimentally investigated. Lasers low loss (narrow linewidth) have comparable amplitude noise. For an output optical power 0.8 mW linewidth 55 MHz, level measured is 148 dB/Hz bandwidth at 40 frequency. ultimate sensitivity OPM based on two-beam M Z -scheme studied VCSELs was estimated as ~ 11 fT/sqrt(Hz)sqrt. Keywords: vertical-cavity surface-emitting laser (VCSEL), systems, (OPAM), relative (RIN), polarization-resolved RIN.