The VCSEL has been mounted in a fiber pigtailed package with the external mirror mounted on a shear piezo. The package incorporates a miniature Rb cell locker to lock the VCSEL wavelength. This VCSEL operates in single frequency and is tuned by a combination of piezo actuator, temperature and current. Mode-hop free tuning over >30GHz frequency span is obtained. The VCSEL has been locked to the Rb D2 line and feedback control used to obtain line-widths of <100kHz.
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L. S. Watkins, C. Ghosh, J.-F. Seurin, D. Zhou, G. Xu, B. Xu, A. Miglo, "High power VCSEL devices for atomic clock applications," Proc. SPIE 9616, Nanophotonics and Macrophotonics for Space Environments IX, 96160J (1 September 2015);