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Humboldt-Universität zu Berlin - Faculty of Mathematics and Natural Sciences - Optical Systems

Humboldt-Universität zu Berlin | Faculty of Mathematics and Natural Sciences | Department of Physics | Optical Systems | Publications | Stabilizing A Terahertz Quantum-cascade Laser Using Near-infrared Optical Excitation

Tasmim Alam, Martin Wienold, Xiang Lü, Lutz Schrottke, Holger T Grahn, and Heinz-Wilhelm Hübers (2020)

Stabilizing A Terahertz Quantum-cascade Laser Using Near-infrared Optical Excitation

In: 44th International Conference on Infrared, Millimeter, and Terahertz Waves.

We demonstrate a technique to simultaneously stabilize the frequency and output power of a terahertz quantum-cascade laser. The technique exploits frequency and power variations upon near-infrared excitation and does not require an external terahertz optical modulator. By locking the frequency to a molecular absorption line, we obtain a linewidth of about 260 kHz and root-mean-square power fluctuations as low as 0.03\%.

QCL stabilization