System and method used for producing Laguerre-Gaussian correlated partial coherence gauss beam

Abstract

The invention discloses a system used for producing a Laguerre-Gaussian correlated partial coherence gauss beam. The system comprises a beam expander, a spatial light modulator, a beam shrinking mirror, a ground glass sheet, a lens and a Gaussian filter sheet along the direction of light in sequence. A computer-generated hologram forms a computer-generated holographic grating after being loaded on the spatial light modulator, and then a Laguerre-Gaussian beam with only an angular module is produced. The beam shrinking mirror is used for controlling the spot size of the Laguerre-Gaussian gauss beam on the rotary ground glass sheet to adjust coherence of an outgoing beam. The ground glass sheet is used for changing the Laguerre-Gaussian gauss beam to the Laguerre-Gaussian correlated partial coherence gauss beam. The lens is used for collimation of the partial coherence gauss beam. The Gaussian filter sheet is used for converting light distribution of the beam to Gaussian distribution. Due to flexibility of the computer-generated hologram, Laguerre-Gaussian beams with different orders and only angular modules can be produced by producing different holograms, and therefore Laguerre-Gaussian correlated partial coherence gauss beams with different orders are produced.

Description

technical field [0001] The invention relates to a system and a method for generating partially coherent Gaussian light beams of Laguerre-Gauss correlation by using the technology of computing holography and rotating frosted glass to generate partial coherence. Background technique [0002] Since the invention of laser by American physicist Theodore Maiman in 1960, laser has been widely used in various fields such as laser communication, laser ranging, and aerial surveying and mapping due to its advantages of high intensity, high monochromaticity, and high coherence. Applications. [0003] In practical applications, it is found that high-coherence or fully coherent lasers have certain limitations in some applications. For example, when a beam of high-coherence laser is transmitted in a random medium, it is very strongly affected by the medium, making the beam Distortion occurs in a very short distance, the light intensity flickers and drifts greatly, and the beam quality dec...

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Problems solved by technology

[0004] At present, the most widely studied partially coherent beam model is the partially coherent light described by Schell in his doctoral thesis with Gaussian correlation, that is, the Gauss-Scher mode beam. Scientists can generate Gauss-Scher mode beams in the laboratory, and then have Partially coherent lasers with different correlation forms have been proposed one after another in theory, such as the first type of Bessel correlation light source, the second type of Bessel correlation light source, non-uniform Gauss-Scherer light source, LED light source, multi-Gauss-Scherer source and Laguerre-Gaussian correlation or Bessel-Gaussian correlation light source, Gauss-Scherer light source and the first type of Bessel correlation light source can be mainly produced in experiments at present, and other related partially coherent light sources are only theoretical models , the experimentally generated method has not been reported

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