Ultrafast Science / 2021 / Article / Fig 10

Review Article

Broadband THz Sources from Gases to Liquids

Figure 10

THz generation from liquid nitrogen [67]. (a) Diagram of the apparatus for guiding an LN2 line. By filling it with LN2, the liquid in the flask prevents the liquid in the syringe transferring heat. (b) A photo of a flowing LN2 line in an ambient environment. The transparency of the line indicates the liquid phase clearly with a smooth surface. (c) Comparison of THz waveforms from water and LN2 under the same optical excitation. Inset: corresponding spectra.