Absolute frequency measurements on the 5s5p^{3}P_{0} → 5s6d^{3}D_{1} transition in strontium

Abstract

We report the first absolute frequency measurements for the 5s5p^{3}P_{0}→5s6d^{3}D_{1} transition at 394 nm for all the stable strontium isotopes by utilizing repumping induced spectroscopy in a magneto-optical trap. Absolute transition frequency is measured to be 760524409251(25) kHz for ^{88}Sr. With reference to ^{88}Sr, the isotope shifts are measured to be 91052(35), 54600(33), and 51641(28) kHz for ^{84}Sr, ^{86}Sr, and ^{87}Sr, respectively. We calculate the hyperfine constants A and B for the fermionic isotope ^{87}Sr at kHz level. Furthermore, we perform King plot analysis by combining isotope shifts on the 689-nm transition to our data.