Saturday, July 12, 2014

Abstract-Broadly tunable monolithic room-temperature terahertz quantum cascade laser sources

Electrically pumped room-temperature semiconductor sources of tunable terahertz radiation in 1–5 THz spectral range are highly desired to enable compact instrumentation for THz sensing and spectroscopy. Quantum cascade lasers with intra-cavity difference-frequency generation are currently the only room-temperature electrically pumped semiconductor sources that can operate in the entire 1–5 THz spectral range. Here we demonstrate that this technology is suitable to implementing monolithic room-temperature terahertz tuners with broadband electrical control of the emission frequency. Experimentally, we demonstrate ridge waveguide devices electrically tunable between 3.44 and 4.02 THz.

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