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Article
Title	In‐Source High‐Resolution Spectroscopy Using an Integrated Tunable Raman Laser
Author(s)	Granados, Eduardo (CERN) ; Stoikos, Georgios (CERN) ; Bernerd, Cyril (CERN) ; Chrysalidis, Katerina (CERN) ; Echarri, Daniel T (CERN) ; Fedosseev, Valentin N (CERN) ; Heinke, Reinhard (CERN) ; Marsh, Bruce A (CERN)
Publication	2023
Number of pages	9
In:	Laser Photonics. Rev. 18 (2023) 2300564
DOI	10.1002/lpor.202300564
Subject category	Nuclear Physics - Experiment
Abstract	Tunable single-frequency lasers are the most prominent tool for high-resolution spectroscopy, allowing for the study and exploitation of the electronic structure of atoms. A significant milestone relies on the demonstration of integrated laser technology for performing such a task. The device presented here is composed of a compact Fabry–Perot monolithic resonator capable of producing tunable and Fourier-limited nanosecond pulses with a MHz-class frequency stability without active cavity stabilization elements. It also has the remarkable capability of exploiting the Raman effect to funnel efficiently the broad spectrum of an input laser to a spectrally-bright Stokes pulse at hard-to-access wavelength ranges. The targeted atom for the demonstrations is 152Sm, released as an atomic vapor in a hot cavity environment. Here, the Stokes field is tuned to a wavelength of 433.9 nm, while a crossed-beams spectroscopy setup is used to minimize the Doppler broadened spectral features of the atoms. With this work, the suitability of integrated diamond Raman lasers as a high-resolution in-source spectroscopy tool is demonstrated, enabling many applications in atomic and nuclear physics. The integrated form-factor and inherent simplicity makes such a laser an interesting prospect for quantum-technology based sensing systems and related applications.
Copyright/License	publication: © 2023-2024 The Authors (License: CC-BY-4.0)

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