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Terahertz (THz) sideband generation on a near-infrared (NIR) carrier has been recently demonstrated using quantum cascade lasers (QCL), with potential applications in wavelength shifting and THz up-conversion. However, the NIR wavelength range and nonlinear efficiency were severely limited by absorption. Here we overcome this drawback through a novel reflection geometry, whilst preserving a large...
Broadband time-domain spectroscopy has been used to measure the terahertz frequency absorption of single crystal proteins. A dehydration study of tetragonal hen egg-white lysozyme is presented as a proof of concept.
We have studied the terahertz frequency spectra of a homologous organic series of tetraalkylammonium bromides to investigate how a systematic molecular change directly affects the spectral modes. The spectra overall show similar absorption features, with the modes shifting to lower frequencies as the molecular mass increases.
A 3.1THz phonon depopulation-based quantum-cascade-laser is investigated using terahertz time domain spectroscopy. A gain of 25cm−1 and absorption features due to the lower laser level being populated from a parasitic electronic channel are highlighted.
We review recent experiments on the use of terahertz frequency time-domain spectroscopy to sense materials of security relevance. We also explore developments in the use of terahertz quantum cascade lasers to discriminate such materials, and new THz sources that can potentially exploit convenient communication wavelength excitation lasers.
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