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Utilizing a genetic algorithm, we optimized the dispersion compensation of terahertz quantum cascade laser frequency combs up to fourth-order. The fully dispersion-compensated device shows a larger dynamic range and a broader spectral coverage, exhibiting comb formation over 800 GHz.
We study the feasibility of dispersion compensated terahertz quantum cascade lasers combs operating around 2.65–2.95 THz to perform multiheterodyne spectroscopy. The devices show short-term intermode beat note frequency drift after 30 μs, which indicates that reliable multiheterodyne spectroscopy over extended time-scale requires phase and timing correction to allow for coherent averaging.
In recent years, quantum cascade lasers (QCLs) have shown tremendous potential for the generation of frequency combs in the mid-infrared and terahertz portions of the electromagnetic spectrum. The research community has experienced success both in the theoretical understanding and experimental realization of QCL devices, capable of generating stable and broadband frequency combs. Specifically, it...
Utilizing the Kalman filter-based averaging scheme, we demonstrated THz dual-comb spectroscopy covering 282 GHz at ∼2.8 THz with unstabilized quantum cascade laser frequency combs. The peak signal-to-noise ratio(SNR) is 60 dB within 100 us averaging.
The temporal profile of frequency combs based on quantum cascade lasers has been unclear for some time. We show how the SWIFTS technique directly measures such properties, obtaining combs' intensities and frequencies versus time.
We demonstrate broadband terahertz laser frequency combs, compact semiconductor devices that combine the high power of lasers with the broad spectra of pulsed sources.
A terahertz pulse emitter is fabricated alongside a quantum cascade laser with a metal-metal waveguide. Terahertz pulses are used to measure the gain of the laser ridge, which is clamped above threshold to 18 cm−1.
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