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We have realized optical excitation, trapping and detection of theradioisotope $^{81}$Kr with an isotopic abundance of 0.9 ppt. The 124 nm lightneeded for the production of metastable atoms is generated by a resonantdischarge lamp. Photon transport through the optically thick krypton gas insidethe lamp is simulated and optimized to enhance both brightness and resonance.We achieve a state-of-the-art $^{81}$Kr loading rate of 1800 atoms/h, which canbe further scaled up by adding more lamps. The all-optical approach overcomesthe limitations on precision and sample size of radiokrypton dating, enablingnew applications in the earth sciences, particularly for dating of polar icecores.

Optical Excitation and Trapping of $^{81}$Kr