Title :
Reduction of Facet Reflectivity of Quantum-Cascade Lasers With Subwavelength Gratings
Author :
Dirisu, Afusat O. ; Silva, Grace ; Liu, Zhijun ; Gmachl, Claire F. ; Towner, Fred J. ; Bruno, John ; Sivco, Deborah L.
Author_Institution :
Dept. of Electr. Eng., Princeton Univ., NJ
Abstract :
We demonstrate the reduction of the facet reflectivity of quantum-cascade lasers (QCLs) by using subwavelength gratings. The gratings were fabricated on lambda=4.9- and 9.8-mum QCLs using focused ion beam milling. Reflectivities as low as 1%-3% for the 4.9-mum QCL and as low as 4%-8% for the 9.8-mum QCL are reported
Keywords :
diffraction gratings; ion beam applications; optical fabrication; quantum cascade lasers; reflectivity; 4.9 mum; 9.8 mum; facet reflectivity; focused ion beam milling; quantum-cascade lasers; subwavelength gratings; Coatings; Distributed feedback devices; Gratings; Laser feedback; Laser modes; Laser theory; Quantum cascade lasers; Reflectivity; Semiconductor lasers; Thin film transistors; Antireflection (AR); grating; midinfrared; quantum-cascade lasers (QCLs);
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2006.890755
