Gaussian Shell model (GSM) shaping method and system

Abstract

The invention discloses a Gaussian Shell model (GSM) shaping method. After a GSM beam is expanded through a beam expanding mirror and the size of a light spot is changed, the GSM beam vertically enters a first thin lens, and is focused on an amplitude attenuation piece. The light beam from the amplitude attenuation piece is outputted through a second film lens in a collimation manner, thereby obtaining a special part coherent beam. The method can achieve the simultaneous or independent modulation of the light intensity and coherence of the GSM beam, can obtain a result that the distribution of the light intensity and coherence is non-Gaussian distribution, and greatly increases the types of light beams. The invention also discloses a GSM shaping system.

Description

technical field [0001] The invention relates to the field of lasers, in particular to a shaping method and shaping system for a Gaussian Schell mode beam. Background technique [0002] Since the appearance of the laser in the 20th century, it has four characteristics that other natural beams cannot match: high coherence, high collimation, high intensity and good monochromaticity, so it has promoted the rapid development of many fields in the 20th century , A large number of researchers have spared no effort to explore and study its own characteristics and applications, which has greatly accelerated the progress of science and technology in the 21st century. A large number of facts have proved that laser has played an irreplaceable role in military, industrial and basic scientific research. [0003] However, many fields have shown that high coherence has become the "short board" of lasers, because the higher the coherence, the easier it is to cause interference during the tr...

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Problems solved by technology

[0003] However, many fields have shown that high coherence has become the "short board" of lasers, because the higher the coherence, the easier it is to cause interference during the transmission of the beam, the more obvious the interference fringes, and the formation of "spots", which will interfere with the laser Information storage and transmission, poor imaging quality, uneven heat treatment of materials, etc.; researchers found that the higher the coherence of laser beams in the transmission of random media such as turbulent atmosphere and turbulent oceans, the easier it is for the beam to cause jitter during transmission (the available beam drift amount to describe), and spot flickering (can be measured by the scintillation index), so this will become an obstacle to laser atmospheric communication; in addition, the researchers also found that: the smaller the beam coherence, the easier the beam is to cause divergence, then in the same In the area, the beam is more uniform, which plays an important role in industrial fields such as laser coating, etc.

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