Title :
Low-Divergence Surface-Emitting Terahertz Quantum Cascade Lasers
Author :
Fan, Jonathan A. ; Belkin, Mikhail A. ; Capasso, Federico ; Khanna, Suraj ; Lachab, Mohamed ; Davies, Giles ; Linfield, Edmund H.
Author_Institution :
Harvard Univ., Cambridge
Abstract :
We investigate surface-emission via a second-order grating in terahertz quantum cascade lasers. We optimize grating design and suppress facet reflectivity with absorbing waveguide edges. Single-mode lasing, small beam divergence, and improved slope efficiency are observed.
Keywords :
diffraction gratings; laser beams; laser modes; quantum cascade lasers; reflectivity; submillimetre wave lasers; surface emitting lasers; waveguide lasers; facet reflectivity; low-beam divergence surface-emitting lasers; second-order grating design; single-mode lasing; slope efficiency; terahertz quantum cascade lasers; waveguide edges; Frequency; Gratings; Laser modes; Optical surface waves; Optical waveguides; Quantum cascade lasers; Surface emitting lasers; Testing; Vertical cavity surface emitting lasers; Waveguide lasers;
Conference_Titel :
Lasers and Electro-Optics, 2007. CLEO 2007. Conference on
Conference_Location :
Baltimore, MD
Print_ISBN :
978-1-55752-834-6
DOI :
10.1109/CLEO.2007.4453166
