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2019•Unpublished venueRequires access

Frequency tuning of terahertz quantum-cascade lasersby spatially controlled optical excitation

Tasmim Alam, Martin Wienold, Xiang Lü, K. Biermann, L. Schrottke, H. T. Grahn, Heinz‐Wilhelm Hübers

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Abstract

We demonstrate the feasibility of wideband frequency tuning of terahertz quantum-cascade lasers by spatially well-controlled near-infrared optical excitation. We observe a single-mode continuous-wave frequency coverage of up to 40 GHz for a 3.1 THz laser. This represents a tenfold improvement of the tuning range for the same device as compared to tuning by current. This method is applicable to a wide variety of existing terahertz quantum-cascade lasers.

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What this paper is about

We demonstrate the feasibility of wideband frequency tuning of terahertz quantum-cascade lasers by spatially well-controlled near-infrared optical excitation. We observe a single-mode continuous-wave frequency coverage of up to 40 GHz for a 3.1 THz laser. This represents a tenfold improvement of the tuning range for the same device as compared to tuning by current. This method is applicable to a wide variety of existing terahertz quantum-cascade lasers.

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Available abstract

We demonstrate the feasibility of wideband frequency tuning of terahertz quantum-cascade lasers by spatially well-controlled near-infrared optical excitation. We observe a single-mode continuous-wave frequency coverage of up to 40 GHz for a 3.1 THz laser. This represents a tenfold improvement of the tuning range for the same device as compared to tuning by current. This method is applicable to a wide variety of existing terahertz quantum-cascade lasers.

Key concepts: Terahertz radiation, Cascade, Quantum cascade laser, Photomixing, Laser, Excitation, Optoelectronics, Optics

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