Title :
High-Power Distributed Feedback Terahertz Quantum Cascade Lasers
Author :
Tao Wang ; Jun-Qi Liu ; Yan-Fang Li ; Jian-Yan Chen ; Feng-Qi Liu ; Li-jun Wang ; Jin-Chuan Zhang ; Zhan-Guo Wang
Author_Institution :
Key Lab. of Semicond. Mater. Sci., Inst. of Semicond., Beijing, China
Abstract :
Single-mode operation of distributed feedback (DFB) terahertz quantum cascade lasers based on metal-stripe surface grating structure is reported. Strong DFB coupling and low waveguide loss conditions are obtained while maintaining a high laser output power. A record high edge-emitting optical power of 57 mW, ~ 96.2 μm at 10 K together with a well-shaped far-field pattern is presented. Reliable dynamic single-mode emission at all injection currents and operating temperatures is realized with a side-mode suppression ratio .
Keywords :
diffraction gratings; distributed feedback lasers; laser beams; laser modes; laser reliability; microwave photonics; optical losses; quantum cascade lasers; waveguide lasers; DFB coupling; dynamic single-mode emission; edge-emitting optical power; high-power distributed feedback terahertz quantum cascade lasers; injection currents; laser output power; metal-stripe surface grating structure; operating temperatures; power 57 mW; side-mode suppression ratio; single-mode operation; temperature 10 K; waveguide loss; well-shaped far-field pattern; Couplings; Gratings; Laser modes; Measurement by laser beam; Optical waveguides; Quantum cascade lasers; Surface emitting lasers; Distributed feedback lasers; quantum cascade lasers; single-mode lasers;
Journal_Title :
Electron Device Letters, IEEE
DOI :
10.1109/LED.2013.2280713
