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A unique feature of Quantum Cascade lasers is the possibility to stack active regions. Using a three stack heterogeneous Quantum Cascade laser ultra broadband amplification and short pulse generation is demonstrated. High power output is achieved by two stacked symmetric active regions.
Time-domain terahertz spectroscopy (THs-TDS) has demonstrated its power in last two decades. With technological development of ultra-fast lasers and THz photonics, the sensitivity, signal dynamic range and the speed of acquisition of spectral information have been continuously improved. Here we present a proof of the principle of a confluence of THz-TDS and quantum cascade laser that holds promise...
A compact trace gas sensor based on a thermoelectrically cooled quasi CW quantum cascade laser is reported. Direct absorption of SO/sub 2/ was used for laser characterization. 2f wavelength modulation spectroscopy was applied to ammonia monitoring.
Continuous wave operation at -30/spl deg/ C of buried heterostructure quantum cascade laser emitting at 5.64 um is reported. The laser exhibited 3 mW of CW power with the threshold current density of 5.4 kA/cm/sup 2/.
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