By: Steve Rummel, Gary Herrit, Alan Hedges II-VI Infrared One of the problems that high power fiber, direct-diode, and disk laser users experience is thermal lensing of their beam delivery optics and debris windows. This is placing increased demands on the optics used in 1 micron laser beam delivery systems. Direct-diode lasers, meanwhile, continue to […]
Month: February 2011
Novel Processes in Laser Micro-fabrication and Micro-joining
By: Kazuyoshi Itoh, YasuyukiOzeki Department of Material and Life Science, Osaka University Focused ultrafast laser pulses can cause a variety of the structural modifications including void, damage, refractive index (RI) change, and crack, depending on materials and irradiation conditions such as pulse energy, pulse width and numerical aperture (NA) of the focusing lens. Among these modifications, […]
Micro-Hole Drilling on Cemented Tungsten Carbide by Ultra Short Laser Pulses
By: Khai Pham Xuan, Kazuya Saginawa, Rie Tanabe, Yoshiro Ito Department of Mechanical Engineering, Nagaoka University of Technology Recently, high precision molds for small products are being highly required in many industrial applications, especially in information communication technology. Mold materials with high hardness, such like cemented tungsten carbide (WC-Co), are difficult to machine by classical […]
Wide Operational Range Pulsed Fiber Laser for Processing Thin Film Photovoltaic Panels
By: Shinobu Tamaoki Sumitomo Electric Inc. Pulse fiber lasers (PFL) have become widely popular for micro-machining applications due to their many benefits, such as the high beam quality, compactness, high wall-plug efficiency, and reliability. MOPA (Master Oscillator Power Amplifier) architectures, which provide temporal pulse shape control, are particularly interesting.
Surface Preparation for Shipbuilding Using a Pulsed High-Power Fibre Laser
By: T. J. Kwee, G. X. Chen, N. R. Lei, K. P. Tan, Y. S. Choo, M. H. Hong Centre of Innovation (Marine & Offshore Technology) Faculty of Engineering, National University of Singapore Ships play a significant role in our life by carrying about 90% of the world’s intercontinental cargo. But the service condition of […]