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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 | Frequency and power stabilization of a terahertz quantum-cascade laser using near-infrared optical excitation

Tasmim Alam, Martin Wienold, Xiang Lü, Klaus Biermann, Lutz Schrottke, Holger T Grahn, and Heinz-Wilhelm Hübers (2019)

Frequency and power stabilization of a terahertz quantum-cascade laser using near-infrared optical excitation

Optics Express.

We demonstrate a technique to simultaneously stabilize the frequency and output power of a terahertz quantum-cascade laser (QCL). This technique exploits frequency and power variations upon near-infrared illumination of the QCL with a diode laser. It does not require an external terahertz optical modulator. By locking the frequency to a molecular absorption line, we obtain a long-term (one-hour) linewidth of 260 kHz (full width at half maximum) and a root-mean-square power stability below 0.03\%. With respect to the free-running case, this stabilization scheme improves the frequency stability by nearly two orders of magnitude and the power stability by a factor of three.

Stabilization, THz QCL, Modulation spectroscopy