2. Laser displacement strategies for waveguide generation
As mentioned above, local modification of the refractive index is the building block for the manufacture of complex functions. This process is achieved by duplicating this index change in 3 dimensions by scanning the laser beam focused in the sample.
2.1 Direct scan
Several laser scanning strategies have been developed, enabling speeds of the order of millimeters per second to be achieved, opening the way to industrial-scale applications. These strategies are illustrated in figure 10 . The most elementary function is to create a continuous trace of positive changes in refractive index capable of guiding light. This ability depends on the symmetry of the modification, its size and...
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