Distance measuring system for orthogonal circular polarized light based on vector vortex light beam
A technology of vortex beam and ranging system, which is applied in optics, measuring devices, nonlinear optics, etc., to achieve the effects of wide application range, high measurement accuracy and low price
Active Publication Date: 2019-02-22
ZHEJIANG SCI-TECH UNIV
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For a vortex beam whose topological charge is an integer, its light field intensity is circularly symmetrical, and for a vortex beam whose topological charge is a fraction, its light intensity is the same as that of an integer, but it will be in A dislocation appears on the bright ring
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[0018] Such as figure 1 As shown, a distance measuring system for orthogonal circularly polarized light based on vector vortex beams is characterized in that it includes a vector vortex beam generator A with angular polarization changes, an attenuator B, and a non-local nonlinear medium The liquid crystal medium C, a small aperture diaphragm D, linear polarizer E, λ / 4 wave plate F and CCD receiver G. The vector vortex beam with angular polarization change generated by the vector vortex beam generator A is expressed as:
[0019]
[0020] Where A 0 Represents the amplitude, Respectively indicate the polarization radius and angular angle of the point (x, y), w 0 Is the waist spot radius of the fundamental mode Gaussian beam, and m and n are the polarization and vortex topological charges, respectively. e x And e y These are the unit vectors in the x and y directions, respectively.
[0021] The vector vortex beam generated by the vector vortex beam generator A with angular polarizat...
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The invention provides a distance measuring system for orthogonal circular polarized light based on a vector vortex light beam. The distance measuring system is characterized by comprising a vector vortex light beam generator with angular polarization changes, an attenuation piece, a non-local nonlinear medium, a small-aperture diaphragm, a linear polarization piece, a lambda / 4 wave plate and a receiving device; the vector vortex light beam generator is used for generating the vector vortex light beam, the attenuation piece is used for controlling the power change of the light beam, the lightbeam is propagated through the non-local nonlinear medium and penetrates through the diaphragm, then linear polarized light is obtained through the linear polarization piece, and forms the left rotation and right rotation circular polarized light, left rotation and right rotation circular polarized light images are presented through the receiving device, and the distance of annular distribution ofthe left rotation and right rotation circular polarized light is measured. Through the distance measuring system, the two rays of left rotation and right rotation orthogonal circular polarized lightcan be generated at the same time, and distribution positions of the left rotation and right rotation orthogonal circular polarized light are controlled; through changes of incident power, a topologycharge numbers m and n and liquid crystal length, the distance of annular distribution of the orthogonal circular polarized light is controlled.
Description
Technical field [0001] The invention relates to the fields of optoelectronic technology, polarization state generation and distribution control, precision measurement, etc., and a distance measuring system based on orthogonal circularly polarized light of vector vortex beams. Background technique [0002] In recent years, the polarization state, as one of the important attributes of the vector light field, has an important influence on the diffraction of light waves and the evolution of time and space. In order to discover more novel optical phenomena, more and more researchers have begun to pay attention to the polarization control of the light field. Therefore, the spatial non-uniform modulation of the polarization state has become a research focus in the current optical field. The polarization-modulated light field constitutes a new type of laser mode whose polarization state changes in space, called a vector light field. Vector light field refers to the light field with diff...
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IPC IPC(8): G02F1/13G01B11/02
CPCG01B11/02G02F1/1313
Inventor 陈瑞品刘彩霞张晓雨王中兴
Owner ZHEJIANG SCI-TECH UNIV