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Narrowband THz pulses generated from a periodically poled lithium niobate crystal are used to injection seed a terahertz quantum cascade laser. The phase locked spectral emission from the quantum cascade laser is significantly influenced by the spectrum of the seed pulse.
We investigate the photothermoelastic response of ZnTe and GaP crystals irradiated by THz-frequency radiation from a quantum cascade laser. We present a full theoretical description of this interaction that agrees well with the measured response.
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.
Many organic compounds exhibit characteristic absorption features in the terahertz (THz) frequency range. Yet, the precise origin of these features is still, in most cases, unknown. This paper shows how solid-state density functional theory can be used to understand the origin of THz spectra in organic crystals, and calculate the THz active normal modes.
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