Fabrication of Microlens by Nd:YVO4 laser irradiation of glass frit layers.

We fabricate flat surfaces with the desired structure using a Nd:YVO₄ laser for writing directly on a glass frit layer deposited over a glass substrate. The deposited layer is based on PbO-SiO₄-B₂O₃ glass frits, which were applied by conventional methods on commercial glass substrates. Lead borosilicate glasses are of technological interest because of their wide glass formation regions and low melting temperatures. The substrate with the glass frit layer is introduced in the furnace to ensure the melting of the glass layer. We have checked different compositions of glass powder to obtain the optimal mixture that leaves us to use the minor temperature in the furnace for ensuring the flatness of the commercial glass substrate. Once obtained the glass frit layer, a Q-switch Nd:YVO₄ laser is used to record the microlens.