Low divergence single-mode surface emitting quantum cascade ring lasers

Mujagić, E.; Hoffmann, L. K.; Schartner, S.; Nobile, M.; Schrenk, W.; Semtsiv, M. P.; Wienold, M.; Masselink, W. T.; Strasser, G.
October 2008
Applied Physics Letters;10/20/2008, Vol. 93 Issue 16, p161101
Academic Journal
We describe the fabrication and operation of surface emitting second-order distributed feedback quantum cascade ring lasers. The devices exhibit single-mode emission at a wavelength of 3.95 μm with a side mode suppression ratio of 25 dB. A linear tuning coefficient of 0.13 cm-1/K is observed. A single longitudinal mode in the ring shaped resonator results in a highly symmetric far-field pattern and a low beam divergence, represented by a full width at half maximum of ∼3°. Based on these characteristics the presented compact coherent light source may find its way into today’s midinfrared spectroscopy applications.


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