Abstract
We have demonstrated a high-energy and broadly tunable monochromatic terahertz (THz) source based on difference frequency generation (DFG) in DAST crystal. The THz frequency was tuned randomly in the range of 0.3-19.6 THz. The highest energy of 870 nJ/pulse was obtained at 18.9 THz under the intense pump intensity of 247 MW/cm2. The THz energy emitted from the DAST crystal was related to the damage of the crystal. Furthermore, tests of transmission spectroscopy of four typical samples were demonstrated with this ultra-wideband THz source.
© 2018 The Author(s)
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