We report on the fabrication of liquid automated filter capable of controlling the intensity of terahertz radiation in the range of 0.4-1.4 THz. The filter is a cell with a magnetic fluid (5% dispersion of 5BDSR particles in 80W-90 synthetic oil) placed on the path of THz radiation between a pair of crossed Helmholtz coils. The prototype created allows achieving an extremely high attenuation coefficient, up to 35 dB. Automatic start-up and stirring system make filter operation repeatable, even with multiple on/off filter state changes. All this allows us to speak about the operability of the presented technology and the possibility of further development of the prototype, the use of similar filters in any THz photonics systems, in which it is required to control the intensity of polarized radiation.
This paper studies nonlinear optical properties of colloidal solutions obtained via pulsed laser ablation (PLA) of bulk targets of magnesium (Mg), bismuth (Bi), tin (Sn), and antimony (Sb) in water and ethanol. In this research Nd:YAG laser (1064 nm, 180 mJ, 7 ns, 20 Hz) was used as a radiation source. Nonlinear absorption and scattering of colloidal solutions were studied by direct nonlinear transmission (NLT) with power density in the range of 1-450 MW/cm2. Except for the solution obtained through the ablation of magnesium in water, all the samples exhibit a nonlinear decrease of transmission as a consequence of the increase of pumping power density. Along with this, the effect of nonlinear limitation of laser radiation depends on the type of particles and solvents.
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