High-Power Distributed Feedback Terahertz Quantum Cascade Lasers

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 .

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