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We present an array of single-mode quantum cascade lasers operating in the range 8–$9.5~\mu \text{m}$ . The resonator features a pair of distributed Bragg reflectors for the mode selection, together with a second-order extraction grating. The radiation of these substrate emitting devices was combined in a single collector ridge. A proof of principle featured seven laser devices with a coverage of...
EC-QCLs operated in pulsed mode have a broader linewidth compared to EC-QCL operated in continuous-wave (CW), but offer wider tuning ranges using the same chip media. EC- QCLs using a heterogeneous active region have already shown broad tuning ranges in pulsed mode, covering the region from 8.2 mum to 10.4 mum using one single chip. This corresponds to 201 cm-1 tuning in wavenumbers, which is 18%...
We present the use of a third order distributed feedback waveguide for double metal THz quantum cascade laser as a successful design to obtain high slope efficiency of 50 mW/A, spectral emission control and narrow single lobed far field (5degtimes 8deg).
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