[1] A. Laurain, L. Cerutti, M. Myara, and A. Garnache, "2.7-µm single-frequency TEM00 operation of Sb-based diode-pumped external-cavity VCSEL," in Proc. Proceedings of SPIE (Photonics West), 2012.

Abstract : We present the design, technology and performances of a tunable Sb-based diode-pumped type-I quantum-well vertical-external-cavity surface-emitting lasers emitting at 2.7 μm. The half VCSEL structure was grown by MBE with quantum-well growth temperature of 440°C. The sample was thermally annealed to optimize the QW gain design. We report on room-temperature continuous-wave laser with 0.17mW output power and low threshold incident pump intensity of 0.7 kW/cm^2 while pumping at 830 nm with a commercial diode laser. The external cavity provides a circular TEM00 beam with a low divergence of 3.6. The short mm-long optical cavity laser exhibits tunable single frequency operation, with a side mode suppression ratio >> 23 dB, a linewidth<< 4GHz and a linear light polarization. Thermal and optical properties are studied.

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