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5 March 2021 Coupled waveguide arrays for terahertz quantum cascade laser frequency combs
Urban Senica, Paolo Micheletti, Mattias Beck, Jérôme Faist, Giacomo Scalari
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Proceedings Volume 11685, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XIV; 116850O (2021) https://doi.org/10.1117/12.2578260
Event: SPIE OPTO, 2021, Online Only
Abstract
We present a terahertz quantum cascade laser array of coupled parallel double metal waveguides, spaced by narrow gaps. The entire array is pumped by a single electrical source, and at a relatively low bias, an equidistant mode spacing and a narrow single beatnote are observed, which are indicating frequency comb operation. The spectrum consists of subgroups of modes separated by an integer multiple of the cavity round-trip frequency. This is a sign that the individual array elements combine to form a global comb, and also suggests the possibility of a harmonic comb formation.
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Urban Senica, Paolo Micheletti, Mattias Beck, Jérôme Faist, and Giacomo Scalari "Coupled waveguide arrays for terahertz quantum cascade laser frequency combs", Proc. SPIE 11685, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XIV, 116850O (5 March 2021); https://doi.org/10.1117/12.2578260
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KEYWORDS
Terahertz radiation
Waveguides
Quantum cascade lasers
Frequency combs
Dispersion
Dry etching
Fabrication
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