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

A A Ionin, I O Kinyaevskiy, Yu M Klimachev, V V Stepanishchev,  I Zh Khafizov

http://iopscience.iop.org/article/10.1088/1742-6596/941/1/012004/meta

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.