A compact, narrow-line-width, fast-data-acquiring, ais-TPG spectrometer

An achromatically injection-seeded terahertz-wave parametric generator (ais-TPG) and a tera-photonics spectra system were closely integrated in an air-free aluminum box with a volume of about 44×66×17 cm3 and successfully used to measure terahertz-wave absorption spectra.