The possibilities of using plasma formed by laser radiation in Ge- and Si semiconductors to create plasma antennas are analyzed. The dependences of the amplitude of the emitted microwave signal in the range of 6-7.5 GHz on the laser power and the length of the irradiated section on the semiconductor plate, which served as a transmitting vibrating antenna, were obtained. It is shown that the amplitude of the transmitted signal during the formation of a plasma antenna in Si and Ge crystals can be increased by more than an order of magnitude. The proposed method for creating a semiconductor plasma antenna with initiation by laser radiation has great prospects for creating materials with controlled electromagnetic characteristics in the radio, microwave and THz spectral ranges.
The optical properties of different cow and pig biological tissues such as skeletal muscle, adipose, spinal cord, and dura mater of the spinal cord were investigated in the spectral range of 350 to 2600 nm. The measurements were carried out by a commercially available spectrophotometer SHIMADZU UV 3101PC. The wavelength dependence on the scattering coefficient has been observed to follow a power-law decay for skeletal muscle and dura mater of spinal cord. The influence of time delay between the sample preparation and measuring of transmittance spectra on the data reasonableness was reviewed. The conclusion about the benefits of 2-μm lasers application in surgery is given for the tissue types listed above.
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