摘要
We set up a model for dealing with the second-harmonic generation （SHG） from molecular dipoles in a line alignment pattern rather than a planar distribution under a microscope. Because of this model, it is possible to perform a flexibly quantitative investigation of SHG from collagen fibres at a molecular level The line alignment pattern induces more significant modifications in both the angular dipole distribution structure A（θ, φ） and the second-harmonic power structure θ（θ, φ）, compared to a planar distribution. Also, the line Mignment angle t has strong effect on A（θ, φ） and θy（θ, φ）, resulting in an irregular SHG angular power distribution. That is to say, it is unnecessary for SHG emission to present two well-defined off-axis lobes. The total SHG power shows two symmetrical peaks at angles of t = 50° and t - 130° while a drop at t = 90°. The weakest SHG signals can be measured at t = 0° and t = 180°.
We set up a model for dealing with the second-harmonic generation （SHG） from molecular dipoles in a line alignment pattern rather than a planar distribution under a microscope. Because of this model, it is possible to perform a flexibly quantitative investigation of SHG from collagen fibres at a molecular level The line alignment pattern induces more significant modifications in both the angular dipole distribution structure A（θ, φ） and the second-harmonic power structure θ（θ, φ）, compared to a planar distribution. Also, the line Mignment angle t has strong effect on A（θ, φ） and θy（θ, φ）, resulting in an irregular SHG angular power distribution. That is to say, it is unnecessary for SHG emission to present two well-defined off-axis lobes. The total SHG power shows two symmetrical peaks at angles of t = 50° and t - 130° while a drop at t = 90°. The weakest SHG signals can be measured at t = 0° and t = 180°.
