Laser Light Technologies incorporates fundamental, doubled and tripled frequency YAG lasers into micromachining systems. Each laser type has typical system setups and uses, but your specific application is what ultimately drives our laser selection.
Fundamental frequency YAG lasers are ideal for micromachining many metals and ceramics. This type of laser is typically mounted with a short focal length lens inside a gas-assisted nozzle; this combination helps make cleaner edge cuts possible. For most applications, we find oxygen is the ideal assist gas for cut edge quality. For applications with special alloys like Nitinol or MP35N, oxygen is replaced with argon to prevent oxide film formation on cut edges.
For micromachining some plastics and reflective metals such as gold, aluminum and copper, we use doubled frequency YAG lasers with a wavelength of 0.532 nanometers. The laser’s shorter wavelength helps produce a smaller heat affected zone (HAZ) for less edge melting. A typical system includes high-precision mechanical stages and a galvanometer head for faster cycle time and batch processing. By adding software, we can also achieve infinite field of view (IFV), enabling cuts to more of a part’s surface.
We use our triple frequency YAG lasers for micromachining materials with a low tolerance for heat, including multilayer laminates, adhesive films and thin ceramic parts. A shorter wavelength of 0.355 nanometers allows the triple frequency YAG laser beam to focus on a smaller spot size and still maintain the focus depth needed to drill holes. Typical system configurations for this laser are similar to those created for double frequency lasers.