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Two-photon spectroscopy of helium \(2^3S_1\)–\(8^3D_{1,2,3}\) transitions at 544 nm with a 1.2 W compact laser system

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Abstract

We have demonstrated two-photon spectroscopy in a power-enhanced cavity of helium \(2^{3}S_{1}\)–\(8^{3}D_{1,2,3}\) transitions in a radio frequency (RF)-discharged vapor cell with a compact laser system at 544 nm. An external-cavity diode laser at 1088 nm was constructed to seed a Ytterbium-doped fiber amplifier. By employing a MgO:PPLN crystal, we have successfully doubled the laser frequency of the fiber amplifier output, generating laser power exceeding 1.2 W at 544 nm. The normalized doubling efficiency was measured to be \(0.78 \%/cm\cdot {}W\). The optical power within the power-enhanced cavity was 11.8 W. Notably, the \(2^3S_1\)–\(8^3D_{1,2,3}\)transitions were observed for the first time. Subsequently, we have investigated the pressure shift and AC stark effect of the spectra. These results pave the way for precision measurement of the transition frequencies and will provide stringent test for QED atomic calculations.

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Data availability

The datasets generated and analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

This project is supported by the Ministry of Education of Taiwan.

Funding

This study was funded by the National Science and Technology Council (contract MOST 107-2112-M-007-007-MY3).

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Authors and Affiliations

  1. Department of Physics, National Tsing Hua University, 101, Section 2, Kuang-Fu Road, Hsinchu, 300044, Taiwan

    Mu-Hao Wu & Li-Bang Wang

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  1. Mu-Hao Wu
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L.W proposed the experiment and M.W performed the measurement and wrote the main manuscript text. All authors reviewed the manuscript.

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Correspondence to Li-Bang Wang.

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Wu, MH., Wang, LB. Two-photon spectroscopy of helium \(2^3S_1\)–\(8^3D_{1,2,3}\) transitions at 544 nm with a 1.2 W compact laser system. Appl. Phys. B 130, 12 (2024). https://doi.org/10.1007/s00340-023-08147-z

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