Sub-4 kHz linewidth distributed feedback lasers at 778.1 nm wavelength for two-photon Rb spectroscopy

Eugenio Di Gaetano; Brendan Keliehor; Paul Griffin; Marc Sorel; Erling Riis; Douglas J. Paul

doi:10.1117/12.2648848

17 March 2023 Sub-4 kHz linewidth distributed feedback lasers at 778.1 nm wavelength for two-photon Rb spectroscopy

Eugenio Di Gaetano, Brendan Keliehor, Paul Griffin, Marc Sorel, Erling Riis, Douglas J. Paul

Proceedings Volume PC12440, Novel In-Plane Semiconductor Lasers XXII; PC1244004 (2023) https://doi.org/10.1117/12.2648848
Event: SPIE OPTO, 2023, San Francisco, California, United States

Abstract

GaAs/AlGaAs Distributed Feedback Semiconductor (DFB) lasers with laterally-coupled gratings are demonstrated at 778.1 nm wavelength with output powers up to 48 mW, over 35 dB side-mode suppression ratios, tuning ranges of 0.8 nm, and vertical beam divergences of 20.5. An asymmetrical mode expander and aluminum-free active layers have been used in the material epilayer to reduce the linewidth to 3.67 kHz and relative intensity noise (RIN) of –140 dBc/Hz while maintaining high output powers. The fabricated lasers demonstrate high-resolution spectroscopy of the hyperfine levels of the 87Rb two-photon transitions and are suitable for integration into miniaturized cold atom systems.

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Citation Download Citation

Eugenio Di Gaetano, Brendan Keliehor, Paul Griffin, Marc Sorel, Erling Riis, and Douglas J. Paul "Sub-4 kHz linewidth distributed feedback lasers at 778.1 nm wavelength for two-photon Rb spectroscopy", Proc. SPIE PC12440, Novel In-Plane Semiconductor Lasers XXII, PC1244004 (17 March 2023); https://doi.org/10.1117/12.2648848

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KEYWORDS

Rubidium

Spectroscopy

Cladding

Wave propagation

Laser beam propagation

Modulators

Optical components

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