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Directional single mode quantum cascade laser emission using second-order metal grating coupler

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5 Author(s)
Maisons, G. ; Alcatel Thales III-V Lab, 1 Avenue Augustin Fresnel, 91767 Palaiseau, France ; Carras, M. ; Garcia, M. ; Simozrag, B.
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We report on the design and experimental demonstration of a substrate emitting quantum cascade laser (QCL) with low beam divergence in the two directions. A low-loss, index-coupled, distributed feedback laser is coupled to a monolithic extraction area. Both functions are performed with a top metal grating spatially differentiated for improving the divergence of the QCL in the two directions. Spectrally single-mode InGaAs/AlInAs QCL emitting at a wavelength of 5.65 μm with a low beam divergence, represented by a full width at half maximum of 2.3° and 4°, is demonstrated at room temperature with a threshold current of 2.1 kA/cm2.

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Applied Physics Letters  (Volume:98 ,  Issue: 2 )