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Description
We present an innovative approach for in-vacuum cavity-enhanced UV spectroscopy that enables almost continuous measurements over multiple days, reducing mirror degradation due to high-power UV radiation. Our technique utilizes pulsing of the cavity's internal power, which elevates the UV intensity to its peak only briefly when the atom under study is within the cavity mode volume, while maintaining a low average power to avoid mirror degradation [1].
Moreover, this technique significantly reduces the laser-induced background on charged particle detectors. The specified 244 nm laser system is intended for 1S-2S two-photon CW spectroscopy of muonium as part of the Mu-MASS project [2]. It has been tested to deliver intracavity powers exceeding 20 W, necessitating maintenance only a few times daily. The pulsing method shows minimal effect on the radiation frequency, with no observed shifts greater than 15 kHz. Our method offers a promising new approach for high precision spectroscopy of atoms in challenging UV environments and demonstrates the viability of CW spectroscopy of muonium.
[1] N. Zhadnov, A. Golovizin, I. Cortinovis, B. Ohayon, L. de Sousa Borges, G. Janka, P. Crivelli, “Pulsed CW laser for long-term spectroscopic measurements at high power in deep-UV”, soon in Opt. Express (2023).
[2] P. Crivelli, “The Mu-MASS experiment”, Hyperfine Interact. (2018).
