Title: MODULAR SYSTEM DESIGN FOR FLEXIBLE LASER PROCESSING
Authors: Marc J. Froning, Matthew C. Johnson, Scott L. Helm, Fei Cai, Ashley C. Tracey, Sohail J. Nassiri, Kay Y. Blohowiak
Abstract: Structural polymer composites in aerospace applications require secondary processing to enable their use for a wide variety of applications. These composite structures need to be drilled, part marked, and have their surfaces prepared for subsequent painting, sealing, and bonding operations. This drives the need for a wide range of laser processes to efficiently support those secondary operations. With careful manipulation of processing parameters, ultraviolet (UV) lasers are uniquely capable of performing each of these processes to polymer composite materials.
Operating at 355 nm, UV lasers have a much shorter wavelength than most lasers that are currently being used for industrial processing, such as near-infrared (NIR) fiber (1064 nm) or CO2 (10,600 nm) which have shown utility for cleaning and corrosion removal on metals and for paint stripping. During UV laser processing, high-energy photons in the ultraviolet spectrum are delivered to the surface and can break specific chemical bonds in the material, without transmitting through the material and affecting the inner layers and nearby areas of the target area, providing a high degree of process control and repeatability. New generations of UV lasers offer far more power and robustness, making them capable of meeting higher production rates.
This study will describe development of a unique design for a flexible UV laser system which allows a multi-functional use with a quick exchange of optics. This allows for rapid evaluations over a large range of processing conditions for efficient research and development of new laser processes. Large variations in different scan fields, spot sizes and irradiance can be quickly tested and optimized for specific laser applications.
References: 1. Nie, S. & Guan, Yingchun. (2017). Review of UV laser and its applications in micromachining. Guangdian Gongcheng/Opto-Electronic Engineering. 44. 1169-1179. 10.3969/j.issn.1003-501X.2017.12.004. 2. R. Staehr, M. Henzler, V. Wippo, P. Jaeschke, S. Kaierle, L. Overmeyer, "Thermal process control for laser micro-drilling of thin CFRP-laminates," Proc. SPIE 11994, High-Power Laser Materials Processing: Applications, Diagnostics, and Systems XI, 1199407 (4 March 2022); doi: 10.1117/12.2607494. 3. Peter E. Dyer, "Excimer laser polymer ablation: the first twenty years," Proc. SPIE 4760, High-Power Laser Ablation IV, (13 September 2002); doi: 10.1117/12.482126.
Conference: SAMPE 2023
Publication Date: 2023/04/17
Price: $16.00Get This Paper