Ultrafast Science / 2021 / Article / Tab 4

Review Article

Broadband THz Sources from Gases to Liquids

Table 4

Comparison between THz generation from air and water.

AirWater

Optimal optical pulse durationShortestSubpicosecond
Central THz frequency1 ~ 1.5 THz0.5 ~ 1 THz
THz signal bandwidth1 ~ 1.5 THz0.5 ~ 1 THz
Two-color enhancement in power~106~102
Fluorescence and white lightRelatively weekMuch brighter
Sideways signal (2 in lens is used)No measurable signalStrong sideways signal