The Propagation And Particle Manipulation Of Partially Coherent Beams With Special Correlation Special Correlation

Laser has the advantages of good monochromatism,high brightness and good directionality,and has important practical applications in the fields of laser communication,optical imaging,remote sensing,material heat treatment and optical capture.In some ways,it is more advantageous to reduce the coherence of a beam.For example,a partially coherent beam can reduce the negative effect of the beam on the turbulent medium more than a fully coherent beam.In the past,restricted by the non-negative integral condition of the cross-spectral density function,most scholars studied partially coherent beams based on the traditional Gaussian Schell Mode with correlation function.An important feature of this kind of coherent beams is that the spatial correlation structure satisfies the Gaussian function distribution.In fact,the spatial correlation structure of partially coherent beams is not limited to Gaussian distribution.In recent years,scholars have put forward many theoretical models of specially correlated partially coherent beams by adjusting their spatial correlation structure in a certain way.These partially coherent beams with special correlation structure can generate specific intensity distribution of light field in free space transmission without any optical elements,which has a good prospect in light communication,material heat treatment,beam shaping and particle manipulation.In addition,the transmission characteristics of specially correlated partially coherent beams and the manipulation of particles by them have become a hotspot of research.Optical tweezers are very important for capturing micro particles,measuring micro forces and producing micro devices.This paper mainly discussed the transmission characteristics of Bessel-Gaussian Correlated Schell-Model Beam with Apetures in free space and the adjustable optical cage generated by it,and studies the optical manipulation characteristics of Bessel beam on particles.The main works of this paper are as follows:we deduced the analytical expression of Bessel-Gaussian correlated Schell-Mode Beam,and studied the influence of different beam parameters on its transmission characteristics and how to control the optical cage produced by the beam;Then we added vortex factor to Bessel-Gaussian correlated Schell-Mode Beam and deduced the analytical expression of Bessel Gaussian correlated Vortex Beam,and analyzed the trapping force with different parameters for two different refractive index particles,and discussed the stability of the beam to capture particles.