Abstract
Laser drilling is a noncontact, precise and reproducible technique that can be used to form small diameter and high-aspect ratio holes in a wide variety of materials. Laser drilling is most extensively used in the aerospace, aircraft, and automotive industries. The most important application of laser drilling in the aerospace industry is the drilling of a large number of closely spaced effusion holes with small diameter and high quality to improve the cooling capacity of turbine engine components. Drilling rates as high as 100 holes/s can be achieved in production environment by coordinating the workpiece motions with pulse period of pulsed laser source. Laser drilling does not pose substantial problems at high angles of incidences. Laser drilling is also well suited for the nonconducting substrates or metallic substrates coated with nonconducting materials where the electric discharge machining is limited. In addition, recently the laser drilling of composite materials such as multilayer carbon fiber composites for aircraft applications is attracting increasing interest due to potential advantages of rapid processing, absence of tool wear, and ability to drill high-aspect ratio holes at shallow angles to the surface.
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