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7 February 2011 Single mode and tunable GaSb-based VCSELs for wavelengths above 2 μm
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Results of single mode and tunable GaSb-based VCSELs, with emission wavelengths above 2μm, are presented. Devices are aimed at trace gas sensing applications and operate in two important spectral windows - 2.3 μm and 2.6 μm. The first one is suitable for CO detection and in the second one strong absorption lines of H2S and H2O lie. VCSELs emitting at 2.33 μm operate in continuous-wave (CW) up to heatsink temperatures of 90 °C and deliver the maximum single-mode output power of 0.8 mW at 0°C with an aperture diameter of 6μm. With the introduction of inverted surface relief on top of the processed device, single mode operation has been extended up to 12 μm large aperture devices. The maximum wavelength tuning range of 20 nm has been achieved. VCSELs emitting at 2.6 μm operate in CW mode up to 55 °C, with the maximum single-mode output power of 0.4 mW, at -20 °C. They offer single transverse mode emission up to 9 μm large apertures. The maximum wavelength tuning of 10 nm is presented. Finally, first applications to trace gas sensing are also presented for 2.3 μm GaSb-based VCSELs.
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Markus-Christian Amann, Shamsul Arafin, and Kristijonas Vizbaras "Single mode and tunable GaSb-based VCSELs for wavelengths above 2 μm", Proc. SPIE 7952, Vertical-Cavity Surface-Emitting Lasers XV, 79520D (7 February 2011);


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