Title :
Continuous-wave operation of distributed-feedback quantum cascade laser with ultra-low threshold current density
Author :
Zhang, J.C. ; Wang, L. ; Chen, J.Y. ; Zhao, L.H. ; Liu, F.Q. ; Liu, J.Q. ; Li, Luoqing ; Wang, Z.G.
Author_Institution :
Key Lab. of Semicond. Mater. Sci., Inst. of Semicond., Beijing, China
Abstract :
Continuous-wave operation of a distributed-feedback quantum cascade laser emitting at around 4.6 m grown by solid source molecular beam epitaxy combined with metal organic vapour phase epitaxy is presented. These devices display an ultra-low threshold current density of 0.85 kA/cm2 at 30°C. The low threshold characteristics resulted in continuous-wave operating temperature up to 100°C for thermoelectrically cooled devices and room-temperature continuous-wave output power in excess of 8.5 mW for uncooled devices.
Keywords :
current density; distributed feedback lasers; quantum cascade lasers; vapour phase epitaxial growth; continuous-wave operation; distributed feedback quantum cascade laser; metal organic vapour phase epitaxy; power 8.5 mW; solid source molecular beam epitaxy; temperature 293 K to 298 K; temperature 30 degC; thermoelectrically cooled devices; threshold current density;
Journal_Title :
Electronics Letters
DOI :
10.1049/el.2011.2988
