Micro-fabricated alkali vapor cells for atomic spin gyroscope study

The combination of MEMS technology with atomic spin devices could fabricate chip scale atomic sensors. In most of the atomic devices based on alkali metals, the key component is an alkali vapor cell. Here we describe an alkali vapor cell fabrication technic for atomic spin gyroscope study. In the alkali vapor cell, alkali metal is filled in an oxygen and water free glovebox and noble gas isotopes such as Xe-129 and Xe-131 are also filled. Compared to an atomic magnetometer, in an atomic spin gyroscope, the isotope enriched noble gases are typically very expensive. We need to do recycling of these expensive gases after filling in the anode bonding chamber or else the gases will be wasted. Due to the large volume of the anode bonding chamber utilized in the fabrication process, a recycling platform is built based on liquid nitrogen. The relaxation time is a very important parameter of an alkali vapor cell. We developed a platform with magnetic field shielding system, non-magnetic field heating and single beam atomic spin detection subsystem. The spin relaxation time of the noble gases is tested in this study.