Doppler-free three-photon spectroscopy on narrow-line optical transitions

• URL: http://arxiv.org/abs/2403.09814v1
• Date: Thu, 14 Mar 2024 19:07:07 GMT
• Title: Doppler-free three-photon spectroscopy on narrow-line optical transitions
• Authors: Guglielmo Panelli, Shaun C. Burd, Erik J. Porter, Mark Kasevich,
• Abstract summary: coherent Doppler-free three-photon excitation of the $1S_0$$leftrightarrow$$3P_0$ optical clock transition and the $1S_0$$leftrightarrow$$3P_1$ intercombination transition in free-space thermal clouds of $88$Sr atoms.
• Score: 0.0
• License: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Abstract: We demonstrate coherent Doppler-free three-photon excitation of the $^{1}S_{0}$$\leftrightarrow$$^{3}P_{0}$ optical clock transition and the $^{1}S_{0}$$\leftrightarrow$$^{3}P_{1}$ intercombination transition in free-space thermal clouds of $^{88}$Sr atoms. By appropriate orientation of the wavevectors of three lasers incident on the atoms, the first-order Doppler shift can be eliminated for all velocity classes. Three-photon excitation of the $^{1}S_{0}$$\leftrightarrow$$^{3}P_{1}$ transition enables high-contrast Ramsey spectroscopy with interrogation times comparable to the 21$\mu$s natural lifetime using a single near-resonant laser source. Three-photon spectroscopy on the $^{1}S_{0}$$\leftrightarrow$$^{3}P_{0}$ clock transition, using only laser frequencies nearly resonant with the $^{1}S_{0}$$\leftrightarrow$$^{3}P_{0}$ and $^{1}S_{0}$$\leftrightarrow$$^{3}P_{1}$ transitions, enables a reduction in Doppler broadening by two orders of magnitude and a corresponding $\sim470$Hz linewidth without a confining potential.

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