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Quantum cascade lasers for the mid-infrared spectral range: Devices and applications

Quantenkaskadenlaser für den mittleren infraroten Spektralbereich: Bauelemente und Anwendungen
: Mann, C.; Yang, Q.K.; Fuchs, F.; Bronner, W.; Kiefer, R.; Köhler, K.; Schneider, H.; Kormann, R.; Fischer, H.; Gensty, T.; Elsässer, W.

Kramer, B. ; Deutsche Physikalische Gesellschaft e.V. -DPG-, Arbeitskreis Festkörperphysik:
Advances in Solid State Physics 43
Berlin: Springer, 2003
ISBN: 3-540-40150-4
Deutsche Physikalische Gesellschaft, Arbeitskreis Festkörperphysik (Frühjahrstreffen) <2003, Dresden>
Fraunhofer IAF ()
quantum cascade laser; Quantenkaskadenlaser; mid-infrared; mittleres Infrarot; continuous-wave operation; Dauerstrichbetrieb; trace-gas sensing; Spurengasanalyse

Quantum cascade lasers emitting at lambda about 5 µm based on different active region designs are investigated. Using lattice-matched GaInAs/ AlInAs on InP substrates the maximum peak optical power as well as the maximum pulsed-mode operating temperature is enhanced by incorporating AlAs blocking barriers together with strain-compensating InAs layers into the active regions. Further improvement is achieved by employing strain-compensated GaInAs/ AlInAs quantum wells for which maximum pulsed-mode operating temperatures in excess of 350 K are observed. High-reflectivity coated devices mounted substrate-side down show a maximum continuous-wave operating temperature of 194 K. Also the normalized relative intensity noise is investigated. Finally, a comparison trace-gas sensing experiment employing one of the present quantum cascade lasers and a lead-chalcogenide laser is presented. Detecting the P (25) absorption line of CO, higher stability is obtained using a quantum cascade laser.