By Kovarik A.F.
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Additional info for [Article] A Statistical Method for Studying the Radiations from Radioactive Substances and the X-Rays and Its Application to some γ-Ray Problems
When the screens are used as filters, peak transmissions close to unity are obtained with resonant frequencies in the terahertz depending on the mesh chosen. Furthermore, when several screens are cascaded, the resonance Q and out-of-band attenuation can be improved considerably with little loss in peak transmissivity. Thus filters made from such screens may be useful, for example, in narrow-bandwidth detection experiments, in the removal of troublesome satellite terahertz laser lines, or in the electromagnetic shielding of optical detector cryostats.
24 (b). A special case of difference frequency mixing is optical rectification. The pump and idler beams are identical and the terahertz frequency distribution corresponds to the bandwidth of the pump pulse, AC^THZ = A^pump- The technically rather simple process involves irradiation of an electrooptic material (nonvanishing second-order nonlinearity with one frequency equal to zero) with femtosecond laser pulses creating a time-dependent electric polarization. The induced polarization T is proportional to the intensity of the laser pulse and yields coherent broadband terahertz radiation [18,108,109].
An important disadvantage is that it cannot be used as a cold window. 2 Filters Considerable effort has gone into the development of filters for the terahertz frequency range. Besides narrow band high quality-factor (Q) filters, like interference filters or band-pass filters with Q < 10 providing high peak transmission and good out-of-band attenuation, low- and high-pass filters with sharp onset of transmission at the cut-off frequency are needed for various spectroscopic applications. , nonlinear optics where the second or third harmonic of an intense laser beam must be distinguished from the strong fundamental wave or the selection of a single laser line in a multiline emission.
[Article] A Statistical Method for Studying the Radiations from Radioactive Substances and the X-Rays and Its Application to some γ-Ray Problems by Kovarik A.F.