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Electron Laser Conventional Ac

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In order to alleviate the influence of atmospheric turbulence on coherent optical communication, two kinds of technical means are used, namely "large diameter telescope + single aperture adaptive optics" and "phased array technology". Compared with the first technology, phased array technology has the advantages of small telescope size, low cost and high reliability. In the space coherent optical communication system based on the phased array, the received light beam is divided into multiple beams by the receiving array. Therefore, it is important to synthesize a plurality of sub-beams carrying a communication signal efficiently into a burning laser beam. Aiming at this problem, the research group proposed a coherent polarization synthesis technology based on fiber optic devices.
Two linearly polarized light beams can be combined into a beam of light using a fiber polarization beam splitter, and the synthesized beam is an arbitrary polarization state due to the change in the phase difference of the input beam. In order to control the synthetic beam as linearly polarized 5000mw laser pointer light for the next level of synthesis or for the demodulation of the communication signal, the task group proposed two methods of phase control and polarization control, and carried out theoretical analysis and experimental verification. The results show that both methods can achieve efficient coherent polarization synthesis, synthesize multiple linearly polarized light efficiently into a polarization maintaining fiber and output linearly polarized light.
Terahertz radiation can effectively overcome the shortcomings of other bands in imaging, medical, communications and other applications. However, at present, there are still many bottlenecks in the application of THz wave, one of which is that it is difficult to obtain strong terahertz radiation source. At present, the most effective method to produce strong THz radiation is twist and modulation undulator in the periodic arrangement of magnet formed by electron 1000mw laser pointer beam in conventional accelerators in generating high brightness coherent radiation. However, the traditional linear accelerator and electronic storage ring device has a large volume and high cost. The development of a new generation of radiation sources has been the goal of the scientific community.
In the experiment, the use of a beam of ultra-femtosecond femtosecond intense laser irradiation with the hair wire diameter of the wire target, through the strong interaction of the high power laser pointer plasma to produce directional high-energy electron emission, due to the charge separation effect, Resulting in a very strong radial transient electric field; a large number of high-energy electrons emitted along the direction of the wire are guided by a radial electric field, transmitted along the wire and subjected to periodic helical motion - the equivalent of an electron beam in a micro The spiral motion in the undulator, and the non-linear amplification of the strong THz radiation output, the conversion efficiency of more than 1%.
In this work, the electron beam energy is about 100 keV and the emitter cycle is about 650 μm. The researchers changed the intensity of the radial electric field by changing the diameter of the wire to change the wavelift period and obtain the tunable strong terahertz radiation. By changing the length of the wire, the terahertz radiation intensity was observed with the transmission distance Of the amplification effect, the magnification of more than 10 times. This kind of all-optical micro-wave oscillator is a new type of undulator, which is produced by the same 3000mw laser pointer at the same time. The wave device is expected to be further developed. In strong THz radiation, new light source and free Electronic laser and other related fields are widely used.

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Electron Laser Conventional Ac
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