Quantum cascade lasers with voltage defect of less than one longitudinal optical phonon energy

Efficient use of applied voltage in quantum cascade (QC) lasers is a critical factor in achieving high wall-plug efficiency and low compliance voltage. We demonstrate a QC laser emitting at 4.2 μm featuring a low voltage defect and short injector with only four quantum wells. Devices with a voltage defect of 20 meV, well below the energy of the longitudinal optical phonons, and a voltage efficiency of 91%, a record value for QC lasers, are reported for pulsed operation at 180 K. Voltage efficiencies of greater than 80% are exhibited at room temperature. Overall performance showed wall-plug efficiencies ranging from 21% at cryogenic temperatures to 5.3% at room temperature.

[1]  S. J. Bass,et al.  Electron-phonon interactions in indium gallium arsenide , 1987 .

[2]  Jacob B. Khurgin,et al.  Role of interface roughness in the transport and lasing characteristics of quantum-cascade lasers , 2009, 2009 Conference on Lasers and Electro-Optics and 2009 Conference on Quantum electronics and Laser Science Conference.

[3]  C. Gmachl,et al.  Temperature Dependence of Optical Gain and Loss in $\lambda \approx$ 8.2–10.2 $\mu$m Quantum-Cascade Lasers , 2008, IEEE Journal of Quantum Electronics.

[4]  Hooman Mohseni,et al.  Injectorless quantum cascade laser with low voltage defect and improved thermal performance grown by metal-organic chemical-vapor deposition , 2009 .

[5]  C. Gmachl,et al.  Low voltage-defect quantum cascade laser with heterogeneous injector regions , 2007 .

[6]  Manijeh Razeghi,et al.  Buried heterostructure quantum cascade lasers with high continuous-wave wall plug efficiency , 2007 .

[7]  T. Tanbun-ek,et al.  Low threshold quantum-cascade lasers of room temperature continuous-wave operation grown by metal-organic chemical-vapor deposition , 2007 .

[8]  Mattias Beck,et al.  Continuous Wave Operation of a Mid-Infrared Semiconductor Laser at Room Temperature , 2001, Science.

[9]  Manijeh Razeghi,et al.  Room temperature continuous wave operation of quantum cascade lasers with 12.5% wall plug efficiency , 2008 .

[10]  Federico Capasso,et al.  1.6W high wall plug efficiency, continuous-wave room temperature quantum cascade laser emitting at 4.6μm , 2008 .

[11]  Federico Capasso,et al.  Injectorless quantum-cascade lasers , 2001 .

[12]  Markus-Christian Amann,et al.  High-performance injectorless quantum cascade lasers emitting below 6 μm , 2009 .