Control of ghost and scatter light in retinal camera;

It was calculated and analysed that the ghost was produced from image transmission in SHENGUANG Ⅱ high power laser system.

In this paper, the stray light and ghost image caused by multi-reflection in high power infrared optical systems are analyzed and discussed, and the comprehensive method incorporating paraxial approximation and real ray trace is presented; the data structure of binary tree is used in the storage of interdata so that the storage problem of huge-size data is resolved.

We analyzed the stray light source of system and drew a conclusion that non-image beam has great effect on system qualities and system ghost images caused by parallel windows should not be ignored.

Applying matrix optics to paraxial rays, which travel through different optical elements illuminated with high-power Gaussian beams, the positions of ghost images affected by Kerr-effect-induced nonlinear refractive index of the illuminated optics are studied.

By the method of matrix optics,the formation process of ghost images from the residual reflection when beam passes through a single lens is analyzed and the relation between the localities of the ghost images and the curvature radius of the lens is achieved.

Based on the basic principle of geometrical optics,the transmission of beam is analyzed,a ray tracing method of ghost analysis is mentioned,the mathematical and physical model for analysis of stray light and ghost images has been set up,the analysis software has been presented.

Stray light generated in multi-pass amplification forms a lot of ghost images,which not only seriously influence the Laser beam quality and propagation prope.

By using the transfer matrix of the beam propagation,the movement of the low-order nonlinear ghost images was calculated when high-power Gaussian laser beam passes through the single convexo-convex lens,the single concavo-concave lens and the 4F system and then the movable rules were analyzed.