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We describe a single beam compact Spin Exchange Relaxation Free(SERF)magnetometer whose configuration is compatible with the silicon-glass bondingmicro-machining method. A cylindrical vapor cell with 3mm diameter and 3mm inlength is utilized in the magnetometer. In order to reduce the wall relaxationwhich could not be neglected in micro-machined SERF magnetometer, 3Amagats(1Amagat=2.69$\times$ 10$^{19}$/cm$^3$) neon buffer gas is filled in thevapor cell and this is the first demonstration of a Cs-Ne SERF magnetometer. Wealso did a simulation to show that neon is a better buffer gas than nitrogenand helium which is typical utilized in vapor cells. In order to reduce thelaser amplitude noise and the large background detection offset which isreported to be the main noise source of a single beam absorption SERFmagnetometer, we developed a laser power differential method and a factor of 2improvement of the power noise suppression has been demonstrated. Finally, wedid an optimization of the magnetometer and sensitivity of 40$fT/Hz^{1/2}$@30Hzhas been achieved.

A single beam Cs-Ne SERF magnetometer with differential laser power noise suppression method