Method for inhibiting turbulence flashing and speckling of light spot of laser far field
A laser and spot technology, applied in optics, optical components, instruments, etc., can solve the problems of destroying the spatial coherence of the transmitted laser, uneven energy of the far-field spot, etc. The effect of speckle
Inactive Publication Date: 2015-04-01
CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
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[0005] In order to solve the problem of uneven energy of the far-field spot after the laser is transmitted through the turbulent atmosphere and reflected by the rough surface, the present invention proposes a method for suppressing the turbulent flickering and speckle of the laser far-field spot: using the optical path difference between the beams to destroy the transmission Laser spatial coherence, using different polarization states between beams to increase the polarization diversity of far-field spots, so as to achieve the effect of suppressing turbulent flicker and speckle phenomena, the specific method is realized by building a beam splitting system with adjustable energy and polarization states
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[0039] Assuming that the energy of the laser is E, and linearly polarized light (the angle between the vibration direction and the x-axis is θ), in order to suppress the energy inhomogeneity of the far-field spot, it is necessary to obtain 4 outgoing laser beams, whose energies are E 1x ,E 2x ,E 3x and E 4x , the angles between the vibration direction of linearly polarized light and the x direction are 0°, α, β and γ, respectively. Its specific implementation is as follows:
[0040] figure 1 The output light of the middle laser (assuming the angle θ between the vibration direction of the linearly polarized laser and the horizontal x direction, and the energy is E) is transmitted through the No. 1 1 / 2 wave plate (assumed to be a negative crystal), and the No. 1 1 / 2 wave plate is adjusted to obtain its Angle between optical axis and x direction θ 1λ , after passing through No. 1 1 / 2 wave plate, the angle between the vibration direction of linearly polarized light and the x ...
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The invention relates to a method for inhibiting turbulence flashing and speckling of a light spot of a laser far field. The method comprises the following steps: splitting incident laser light into four beams of energy adjustable co-polarization laser light, ensuring that an optical path difference between every two beams to be greater than coherence length of each beam to avoid mutual coherence in a light splitting process of the four beams of light, adjusting a vibration direction of each beam of light with a 1 / 2 wave plate, and superimposing the four beams of light at a target. According to the method, with the adoption of an energy adjustable and polarization adjustable light splitting and emission technology scheme, the purpose of inhibiting the turbulence flashing and the speckling of an illumination light field is achieved by employing a 1 / 2 wave plate polarization beam splitter prism combination and damaging outgoing beam time coherence and laser light spatial coherence, the polarization diversity of the illumination light field is improved by employing the 1 / 2 wave plate, and the nonuniformity of the light field due to the speckling is further inhibited.
Description
technical field [0001] The invention relates to the technical field of laser far-field applications, in particular to a method for suppressing turbulent flickering and speckle of laser far-field spots. Background technique [0002] In laser far-field applications, the uniformity of far-field light field energy is very important. For example, in laser illumination active imaging applications, if the illumination laser can uniformly illuminate the target area, it will affect the image contrast, resolution and sharpness of the entire imaging system. Both have been greatly improved; in laser communication applications, if the laser energy to the target is uniform and stable, the bit error rate of the system can be greatly reduced, thereby improving system efficiency; The detection and identification of dark targets and small targets are of great significance. [0003] During the transmission of laser light through the atmosphere, due to random changes in the atmospheric tempera...
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IPC IPC(8): G02B27/48G02B27/28
CPCG02B27/285G02B27/48
Inventor 田玉珍王挺峰王锐孙涛郭劲
Owner CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI