Quantum Cascade Laser Arrays
Two-dimensional broadband quantum cascade laser arrays based on distributed-feedback
(DFB) ring cavity surface emitting lasers are a powerful tool for spectroscopy and sensing applications. Our 16-element arrays exhibit a linear tuning range of
180cm-1 centered at a wavelength of 8.2um when operated in pulsed mode at room temperature.
The devices show single-mode emission with a side mode suppression ratio of 30dB. Given by the
facetless nature of the single emitters, the spectral dependent threshold current densities and optical
power reflect the gain profile of the incorporated material and are not impaired by the diversity of
underlying DFB designs.
A conventional ring-QCL array with 16 elements