High-Power Distributed Feedback Terahertz Quantum Cascade Lasers

摘要

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, ${sim}{rm 96.2}~mu{rm m}$ 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 ${>}{rm 17}~{rm dB}$.