Title :
True phase-matched third-order DFB terahertz quantum-cascade lasers using weakly-coupled cavities
Author :
Kao, Tsung-Yu ; Hu, Qing ; Reno, John L.
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., Massachusetts Inst. of Technol., Cambridge, MA, USA
Abstract :
We report a novel laser cavity design in third-order distributed feedback terahertz quantum-cascade lasers based on true phase-matching technique. This approach dramatically in creases the usable length of third-order DFB lasers and leads to even narrower beam patterns and likely higher output power. Single frequency emissions from 150 apertures (5.6-mm long device) are coherently added up to form a narrow beam with ~6° divergence. Similar device with 40 apertures shows more than 5mW optical power with slope efficiency ~40mW/A at 10K pulsed operation.
Keywords :
distributed feedback lasers; laser cavity resonators; optical couplers; optical phase matching; quantum cascade lasers; distributed feedback lasers; laser cavity; temperature 10 K; terahertz quantum-cascade lasers; third-order DFB lasers; true phase-matching; weakly-coupled cavities; Cavity resonators; Distributed feedback devices; Laser beams; Laser modes; Measurement by laser beam; Quantum cascade lasers; Surface emitting lasers;
Conference_Titel :
Lasers and Electro-Optics (CLEO), 2011 Conference on
Conference_Location :
Baltimore, MD
Print_ISBN :
978-1-4577-1223-4
