Sub-Doppler spectroscopy of the strontium intercombination line in a microfabricated vapor cell

Abstract

We report a 100 kHz linewidth for the 1S0 to 3P1 intercombination line of 88Sr atoms at 689nm in a microfabricated 9x14 x4.4 mm3 vapor cell. This puts an upper bound on the residual gas pressure in the vapor cell of 10 mTorr. The microfabricatd Sr vapor cell offers an inexpensive and scalable way to lock lasers in state-of-the-art cold-atom based atomic clocks and quantum computing experiments. It also paves the way for a compact and precise optical frequency references based on alkaline earth vapor cells.