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Updated: Jan 30, 2026

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
Published on: February 28, 2016
Surface Emitting, Tunable, Mid-Infrared Laser with High Output Power and Stable Output Beam
Steven Slivken1, Donghai Wu1, Manijeh Razeghi2
1Center for Quantum Devices, Department of Electrical Engineering and Computer Science, Northwestern University, Evanston, IL, 60208, USA.
Abstract:
A reflective outcoupler is demonstrated which can allow for stable surface emission from a quantum cascade laser and has potential for cost-effective wafer-scale manufacturing. This outcoupler is integrated with an amplified, electrically tunable laser architecture to demonstrate high power surface emission at a wavelength near 4.9 μm. Single mode peak power up to 6.7 W is demonstrated with >6 W available over a 90 cm-1 (215 nm) spectral range. A high quality output beam is realized with a simple, single-layer, anti-reflective coating. The beam shape and profile are shown to be independent of wavelength.
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