The photoconversions efficiency of powerful collimated coherent single-mode and multimode wave beams with λ= 808 nm and 1064 nm was studied and the experimental results are presented. A set photocells based on silicon with different topological structure is considered including monofacial and bifacial cells, as well as those that have a vertical orientation. Photocell characteristics (short-circuit current Isc, open-circuit voltage, Voc and fillfactor) obtained in the temperature range from 25°C to 50°C and also at a beam power, P, of up to 100 Suns are discussed.
The functional expansion of the operating model of a slightly inclined lengthy atmospheric path is described. The experimental setup contains the module of signal beam profile control, the module of a path state active meteooptic control and the module of a beam inclination adaptive correction. The testing results for the designed hardware-software complex under the on-line monitoring of dynamic and stochastic optical parameters of the path are presented. The spatial anisotropy of stochastic and dynamic parameters of the path and the beam was investigated experimentally. The tests of hardware-software adaptive control module for the beam energy center control were carried out using a combination of proportional, integral and differential correction algorithms with the demonstration of the response anisotropy on adaptive impact.
Application of adaptive correction is necessary to control wandering of the laser beam in wireless power transfer (WPT) system. In this paper we describe experimental results of using different adaptive correction techniques for both weak and strong turbulence conditions. All experiments were performed over a 1.5 km near-horizontal atmospheric path. Some criteria for choosing parameters of adaptive correction are given.
Wireless power transmission technology based on high power diode and fiber lasers have a high potential for Earth and space applications. Narrow infrared laser beam can deliver up to 1 kW of electrical power to a photoelectric receiver with dimensions 10-20 cm at distance 1-10 km. To achieve high efficiency it is necessary to fit the beam to the dimension of receiver moving with angular velocity in range 0.5-3 /sec in all range of distance. Thus beam shaping system has to provide fast control of shape, dimensions and position of the beam with high accuracy in condition of atmosphere which distorts the beam. The description and results of the experimental testing of optical system corresponding to the declared characteristics is submitted.
The results of the experimental and theoretical analysis of spatial statistical characteristics of laser beams with wavefront control are presented. The experimental data obtained in different meteorological conditions is used to estimate features of spatial localization of averaged over the ensemble recorded intensity distributions and profiles of second, third and fourth spatial moments. Registered dependence between transverse or longitudinal components of scintillation index and meteorological conditions or setting of beam forming optical system is discussed. In addition, we proposed interpretation of spatial properties of high-order central moments.
In this paper, we describe an experimental setup for laser beam propagation along a horizontal urban path that can be useful for applications such as wireless power transfer or free-space laser communications. This setup can be used for experiments in different atmosphere conditions. Part of obtained results from experiments for 1064 nm laser beam is presented.
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