A geodesic lens with the optimum profile meridional shape calculated from the new exact theoritical formula

[2.3]

was fabricated by the single diamond machine. The curvature radius at the point connected with the planar surface is infinite

and doesn't have singulity. The samples of spherical aberration-free unspherical geodesic lenses were fabricated on the LiNbO

a

substrates with the size of 45×20×2.5mm

and two lenses were arranged on each substrate. The light output from a semiconductor laser with the wavelength of 670nm was end-coupled into sample

the focal spot half-width measured at the other edge is 2.9μm.