Title :
Complex-coupled quantum cascade distributed-feedback laser
Author :
Gmachl, C. ; Faist, J. ; Bailargeon, J.N. ; Capasso, F. ; Sirtori, C. ; Sivco, D.L. ; Chu, S.N.G. ; Cho, A.Y.
Author_Institution :
Lucent Technol., AT&T Bell Labs., Murray Hill, NJ, USA
Abstract :
Quantum-cascade distributed-feedback lasers (QCDFB) with a grating close to the active region are reported. Feedback is provided by the grating in a refractive index-dominated coupling scheme. Reliable single-mode emission at /spl lambda//sub cm//spl ap/5.4 μm with a side-mode suppression ratio (SMSR) /spl ap/30 dB is observed. The laser is continuously tunable over 40 nm with a coefficient of /spl Delta//spl lambda///spl Delta/T/spl ap/0.37 nm/K in the temperature range from 200 K to 300 K. Comparison with Fabry-Perot QC lasers shows an overall improved performance of QC-DFB lasers.
Keywords :
III-V semiconductors; diffraction gratings; distributed feedback lasers; gallium arsenide; indium compounds; infrared sources; laser modes; laser reliability; laser tuning; molecular beam epitaxial growth; optical couplers; semiconductor growth; semiconductor lasers; 200 to 300 K; 5.4 mum; InGaAs-InP; InP; MBE growth; active region; complex-coupled quantum cascade distributed-feedback laser; continuously tunable laser; feedback; grating; mid-IR laser; refractive index-dominated coupling scheme; reliable single-mode emission; side-mode suppression ratio; Distributed feedback devices; Gas lasers; Gratings; Indium gallium arsenide; Laser feedback; Laser modes; Molecular beam epitaxial growth; Quantum cascade lasers; Semiconductor lasers; Waveguide lasers;
Journal_Title :
Photonics Technology Letters, IEEE
