Linewidth of collimated wavelength-converted emission in Rb vapour
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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.
KeywordsAtomic Medium Laser Linewidth Transmission Resonance Atom Number Density Laser Guide Star
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.
- 1.D.C. Hanna, M.A. Yuratich, D. Cotter, Nonlinear Optics of Free Atoms and Molecules, vol. 17 (Springer, Berlin, 1979). Springer series in Optical SciencesGoogle Scholar
- 23.A. Akulshin, D. Budker, R. McLean, Opt. Lett. 39, 845 (2014) Google Scholar
- 24.A. Akulshin, D. Budker, B. Patton, R. McLean, http://iconolat13.phys.msu.ru/ICONO_LAT-2013/Proceedings.html