Spectral Changes Of Gaussian Beams In Biological Tissue Transmission

In recent years,the spectral change of laser in biological tissue has become a research hotspot.In order to carry out in-depth research on medical spectral imaging technology and the physiological state of tissue structure,we have explored,cooperated,promoted and innovated in multiple disciplines to achieve the practicality and applicability of the law of spectral changes of laser in biological tissues.First of all,we must fully understand the spatial and temporal distribution of light in biological tissues,and secondly,build a perfect biological tissue structure model to obtain more accurate optical parameters in biological tissues,such as bio-optical spectral imaging technology and micro-trauma and biological damage of living organisms.The non-invasive diagnosis technology provides theoretical support and source power.In this paper,based on the generalized-Huygens Fresnel principle,the spectral formula of the Gauss-Shell model?GSM?beam,GSM vortex beam,and GSM beam with line edge dislocations in biological tissue transmission is derived.The influence of Gauss-Shell model?GSM?beam on the off-axis distance r of the field point,the transmission distance z,the biological tissue sample?different refractive index structure constantC_n²?and the spatial correlation length ?₀on the spectral change of the GSM beam in biological tissue transmission were studied.influences.The results show that the GSM beam and the GSM vortex beam have spectral blue shift,red shift and jump in the transmission of biological tissue,and are related to the off-axis distance r of the field point,the transmission distance z,the refractive index structure constant C_n² of the biological tissue and the spatial correlation The length ?₀ is related.In addition,the contour plot was used to study the relative spectral displacement of the GSM vortex beam with the field point off-axis distance r and the transmission position z.The results show that the spectral change of the GSM vortex beam in the near-axis region of biological tissue transmission is very weak.It may be because the spectral change induced by the light source alleviates the influence of turbulence in the biological tissue;The jump occurs,which may be caused by the turbulence of tissues squeezing the spectral changes.The strong biological tissue turbulence lags behind the spectral jump,expands the space for observing the spectral jump phenomenon of the beam,and weakens the spectral jump phenomenon in the beam transmission.However,the difference in beam transmission between the human dermis and mouse tissue is very small,which may be the result of the very similar genetic composition of human tissue and mouse tissue.The singularity of the blade phase,that is,the pure dislocation line,according to the shape of the cut or dislocation line,the singularity of the blade phase is divided into a line-type dislocation and a round-type dislocation.In this paper,we mainly study the slope p and off-axis amount d of off-axis dislocation,off-axis distance r of field point,transmission distance z,and spatial correlation length ?₀ pairs of GSM beam with linear edge dislocation when passing through human dermal tissue.Influence of GSM beam spectrum change with line edge dislocation,In addition,the contour plot was used to study the relative spectral displacement of the GSM beam with line-edge dislocations with the off-axis distance r of the field point and the transmission position z.The results show that in the transmission of biological tissue with line edge dislocation GSM beam,as the slope p increases,the field point of the spectral jump position gradually increases off-axis distance r,and the jump variable?decreases accordingly;as off-axis As the amount d increases,the off-axis distance r of the spectral jump position gradually decreases,and the jump variable? decreases accordingly;As the spatial correlation length ?₀ increases,the transmission position z where the spectrum jumps increases,the amplitude of the relative spectral shift ??/?₀ decreases,the spectral jump?decreases,and on the axis?r=0?,the spectrum shifts from red to The transmission distance that becomes blue shift decreases.With the increase of the field point off-axis distance r,the closer the transmission distance of the spectral jump,the smaller the jump variable.