Journal
IEEE PHOTONICS TECHNOLOGY LETTERS
Volume 23, Issue 15, Pages 1049-1051Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LPT.2011.2151853
Keywords
Atomic clock; polarization stability; small-signal modulation response; surface grating; vertical-cavity surface-emitting laser (VCSEL)
Funding
- German Academic Exchange Service (DAAD)
- EC [224132]
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We report the polarization stability and small-signal characteristics of single-polarization single-mode vertical-cavity surface-emitting lasers (VCSELs) emitting at 894.6-nm wavelength for Cs-based miniature atomic clock applications. Polarization control is achieved by integration of a semiconducting surface grating in the top Bragg mirror. The VCSELs are polarized orthogonal to the grating lines with a peak-to-peak difference between the dominant and the suppressed polarization modes reaching 29 dB even at substrate temperatures up to 65 degrees C. A modulation bandwidth of more than 5 GHz is reached at only 0.5-mA bias. Modulation current efficiency factors larger than 12 GHz/root mA are achieved. Moreover, the intrinsic modulation characteristics of the VCSELs are investigated. A K-factor of less than 0.30 ns and a maximum 3-dB bandwidth exceeding 30 GHz are obtained.
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