Theoretical And Experimental Research Of Perfect Optical Waveguide Geodesic Lenses

This thesis is directed against the curvature singularity problem in the analytical solution of meridian of perfect waveguide geodesic lenses which is acquired by Sottini. To solve the problem, on the basis of supposing a generalfunction A(R) of rounded-edge, a optimum theoretical design of perfect waveguide geodesic lenses is given through analyzing the radiation loss. The curvature radius at the joint of rounded-edge and planar waveguide reaches infinite, so the radiation loss vanishes completely. The curvature radius at the joint of rounded-edge and reality lenses is larger, and the radiation loss is decreased and can be omitted. A new theoretical optimum analytical solution .(r) of meridian without singularities is obtained. To our knowledge thisdesign is the best at present.A new perfect geodesic lens whose focus is 20mm, effective aperture is 8mm is fabricated on the LiNbO3 substrate. The main optical properity parameters is tested. The measurements show that this kind of lenses have no spherical aberration across the total effective aperture of 8mm, light transmision loss is under 1.2dB, diffractive spot is about 4 i.i m. These are some advanced properties at international standards. This sample can be used in chip of integrated optics for fibre optical gyroscope and so on.