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Terahertz time domain spectroscopy
In terahertz time domain spectroscopy (THz-TDS), picosecond pulses of terahertz radiation are used to probe different materials. The radiation has several distinct advantages over other forms of spectroscopy: many materials are transparent to THz, THz radiation is safe for biological tissues because it is non-ionizing (unlike for example x-rays), and images formed with terahertz radiation can have relatively good resolution (less than 1 mm).
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