PROCESS FOR OBTAINING A SUBSTRATE

摘要

In a process for obtaining a transparent substrate including a refractive index modulation pattern, a transparent substrate is irradiated with a laser radiation focused on the substrate in the form of at least one laser line, where the substrate at least partially absorbs the laser radiation, a relative movement is generated between the substrate and the laser line focused on the substrate, in a direction (X) transverse to the longitudinal direction (Y) of the laser line, and, in the course of this relative movement, the power of the laser line is temporally modulated as a function of the speed of the relative movement and as a function of the dimensions of the pattern in the direction (X) of the relative movement.

主权项

1. A process for obtaining a transparent substrate having modulated optical properties, comprising a refractive index modulation pattern, the process comprising irradiating a transparent substrate with a laser radiation focused on the transparent substrate in the form of at least one laser line, where the transparent substrate at least partially absorbs the laser radiation, and generating a relative movement between the transparent substrate and the laser line focused on the transparent substrate, in a direction transverse to a longitudinal direction of the laser line, wherein, in the course of the relative movement, a power of the laser line is temporally modulated as a function of a speed of the relative movement and as a function of dimensions of the pattern in the direction of the relative movement.