Abstract

We report on the demonstration of Doppler-free spectroscopy of metastable Sr atoms using a hollow cathode lamp (HCL). We employed a custom Sr HCL, which is filled with a mixture of 0.5 Torr Ne and 0.5 Torr Xe as a buffer gas to suppress velocity changing collisions and increase the populations in all of the ${(5s5p)}^3{P}_J(J=\mathrm{0,1},2)$ metastable states. We performed frequency modulation spectroscopy for the ${(5s5p)}^3{P}_0-{(5s6s)}^3{S}_1$, ${(5s5p)}^3{P}_1-{(5s6s)}^3{S}_1$, ${(5s5p)}^3{P}_2-{(5s5d)}^3{D}_2$, and ${(5s5p)}^3{P}_2-{(5s5d)}^3{D}_3$ transitions with sufficient signal-to-noise ratios for laser frequency stabilization. We also observed the hyperfine transitions of ${(5s5p)}^3{P}_2-{(5s5d)}^3{D}_3$ of ${}^{87}\mathrm{Sr}$. This method would greatly facilitate laser cooling of Sr.

© 2018 Optical Society of America

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