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Femtosecond Laser Nondestructive Removal of Thin Film Material..

With the rapid development of ultrafast laser technology, femtosecond laser has more and more advantages in application because of its shorter pulse and higher peak value compared with picosecond laser. Among them, the removal of coating on glass surface can better reflect the advantages.

Etching of CIGS Solar Thin Film Cells on Glass Substrate


After CIGS thin film solar cells are coated, laser is needed to etch them in the designated area. Picosecond and nanosecond laser are needed to remove the residual film. At the same time, the heat will damage the glass surface and reduce the transmittance and service life of the thin film solar cells.



FemtoYL series of femtosecond industrial lasers developed by Suzhou first-hand laser, with 300fs ultra-narrow pulse width, 5000kHz ultra-high frequency, <1.3 beam quality, <10um focus spot, can effectively solve these problems. According to the test, the optimum parameters are 1000kHz, 10-30 UJ pulse energy (different products), 3000-5000mm/s scanning speed. High energy density focused spot, with the cooperation of high-speed galvanometer, the overlap rate reaches 80%, fast, efficient and uniform removal, so that the product transmittance can reach more than 90%. At the same time, the damage to glass 0 can be removed efficiently, which greatly improves the product life.



Decoating Mobile Phone Glass Cover


Glass cover plate is widely used in mobile phone industry because of its advantages of high strength, high hardness and no interference to signals. Usually the back cover adopts silk printing technology, and then laser processing is used to remove the coating or ink at the designated position. When nanosecond and picosecond lasers remove the coating, the glass strength caused by thermal damage decreases significantly, which reduces the impact resistance of the cover plate, and removes the residual, which greatly affects the transmittance of the camera and other functional holes.



FemtoYL series of femtosecond industrial lasers developed by Suzhou first-hand laser can remove the coating of the preset area accurately, efficiently and perfectly.


Ink thickness of products is generally between 10-40 um, laser frequency is 300-800k, pulse energy is 10-40 uj, laser focus distance is 0-1 mm from ink surface, scanning speed is 500-2000 mm/s, overlap rate is 65-90%. According to the difference of ink thickness, different parameter combinations are selected. At the same time, ultrashort pulse of Femto'YL femtosecond light source is used. In a very short time, the ink layer is removed, and the accumulated heat is not enough to change the glass material. With the repeated scanning of the galvanometer, the ink can be removed evenly without damaging the glass substrate, so as to ensure that the processed glass has good transparency, no internal stress, no microcracks, and effectively enhance the impact resistance.



It is believed that with the continuous development of ultrafast laser and the continuous advancement of industry demand, femtosecond laser will have a broader development space in precision processing applications in more fields such as scientific research, microelectronic devices, medical devices, 3C electronics and so on.

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