Multiline CO₂ laser with Q-switching for generation of terahertz radiation

In this paper we consider the method of obtaining THz radiation by difference frequency generation (DFG) of multiline CO₂ laser. For this purpose a multiline CO₂ laser with Q-switching was created. The three strongest lines, 9 R(18), 9 P(20) and 9 P(22) with wavelengths ∼9.28, ∼9.55 and ∼9.57 μm respectively, held 85% of CO₂ laser power, and can be used to obtain difference frequency at a wavelength of ∼310 μm. DFG of other spectral lines fall within the range of 263 ÷ 8100 μm. Different nonlinear crystals for DFG and filters to separate THz radiation were considered.