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Linewidth of collimated wavelength-converted emission in Rb vapour

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Abstract

We present a study of the spectral linewidth of collimated blue light (CBL) that results from wave mixing of low-power continuous-wave laser radiation at 780 and 776 nm and an internally generated mid-IR field at 5.23 μm in Rb vapour. Using a high-finesse Fabry–Perot interferometer, the spectral width of the CBL is found to be <1.3 MHz for a wide range of experimental conditions. We demonstrate using frequency-modulated laser light that the CBL linewidth is mainly limited by the temporal coherence of the applied laser fields rather than the atom–light interaction itself. The obtained result allows the same 1.3 MHz upper limit to be set for the linewidth of the collimated mid-IR radiation at 5.23 μm, which has not been directly detected.

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Acknowledgments

This work has been supported by the ARC Centre of Excellence for Quantum Atom Optics. A.L., C.P. and G.W.T. thank the ARC for supporting this research through the DP0877938 and FT0990301 research Grants. Also A.L. and C.P. acknowledge support by the South Australian Government through the Premier’s Science and Research Fund. D.B. is grateful to the Centre for Quantum and Optical Science at the Swinburne University of Technology for hosting him as a Distinguished Visiting Researcher.

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Authors and Affiliations

  1. Centre for Quantum and Optical Science, Swinburne University of Technology, Melbourne, Australia

    Alexander Akulshin & Russell McLean

  2. Institute of Photonics and Advanced Sensing, School of Chemistry and Physics, The University of Adelaide, Adelaide, SA, 5005, Australia

    Christopher Perrella & Andre Luiten

  3. School of Physics, University of Western Australia, Nedlands, WA, 6009, Australia

    Gar-Wing Truong & Andre Luiten

  4. Department of Physics, University of California, Berkeley, CA, 94720-7300, USA

    Dmitry Budker

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  1. Alexander Akulshin
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  2. Christopher Perrella
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  3. Gar-Wing Truong
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  4. Andre Luiten
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  5. Dmitry Budker
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  6. Russell McLean
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Correspondence to Alexander Akulshin.

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Akulshin, A., Perrella, C., Truong, GW. et al. Linewidth of collimated wavelength-converted emission in Rb vapour. Appl. Phys. B 117, 203–209 (2014). https://doi.org/10.1007/s00340-014-5823-0

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  • DOI: https://doi.org/10.1007/s00340-014-5823-0

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