Suppression of pointing instability in quantum cascade lasers by transverse mode control

Bouzi, Pierre M.; Liu, Peter Q.; Aung, Nyan; Wang, Xiaojun; Fan, Jen-Yu; Troccoli, Mariano; Gmachl, Claire F.
March 2013
Applied Physics Letters;3/25/2013, Vol. 102 Issue 12, p122105
Academic Journal
We report on a technique that serves to eliminate pointing instability in Quantum Cascade lasers by suppressing the propagation of higher order transverse modes within the laser cavity. This process, achieved via a short and lossy lateral constriction in the waveguide, only allows the fundamental mode to propagate. The beam pointing fluctuations of the modified devices are greatly reduced, with a 10-fold improvement in standard deviation, indicating a stable emitted beam. The far-field pattern has a Gaussian shape, and the slope efficiency of the received power on a 0.87 numerical aperture detector increases by ∼65%, without significant increase in threshold.


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