What is it about?
There is a fundamental reason that prevents quantum cascade lasers from operating at very low frequencies.
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Why is it important?
There are numerous applications for high-power coherent radiation in the frequency range of several terahertz. Quantum cascade lasers are highly popular sources of high-power coherent radiation in the far-infrared region. Several groups around the world are actively working to lower the low-frequency limit of these lasers. Our paper highlights a fundamental reason that hinders lasing at excessively low frequencies.
Perspectives
Our results will help researchers in this area to realize limits of their possible success and to switch their energy and money to other sources of low frequency coherent radiation.
Boris Laikhtman
Hebrew University of Jerusalem
Read the Original
This page is a summary of: Fundamental limitations on gain of terahertz quantum cascade lasers, Journal of Applied Physics, August 2023, American Institute of Physics,
DOI: 10.1063/5.0145064.
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