ICALEO 2009 Paper #305 (Research on Mechanism of Mode-Locking using Semiconductor of Saturable Absorption Mirror in a Solid Laser)

Research on Mechanism of Mode-Locking using Semiconductor of Saturable Absorption Mirror in a Solid Laser
Authors:
Jie Fu, Beijing University of Technology; Beijing Peoples Republic of China
Bingyuan Zhang, Liaocheng University; Liaocheng Peoples Republic of China
Meng Chen, Beijing University of Technology; Beijing Peoples Republic of China
Gang Li, Beijing University of Technology; Beijing Peoples Republic of China
Presented at ICALEO 2009

In this paper, the mechanism of mode-locking using a semiconductor saturable absorption mirror (SESAM) in solid laser was analyzed by half-classical theory. We proposed a new opinion about how the SESAM works to realiz...

ICALEO 2009 Paper #303 (CW and Q-switched Yb-doped Single-Mode Fiber Lasers at 980 nm and their Frequency Doubling with BiBO)

CW and Q-switched Yb-doped Single-Mode Fiber Lasers at 980 nm and their Frequency Doubling with BiBO
Authors:
Pingxue Li, Beijing University of Technology; Beijing Peoples Republic of China
Shuzhen Zou, Institue of Laser Engineering; Beijing Peoples Republic of China
Xuexia Zhang, -; -
Presented at ICALEO 2009

In this paper, we demonstrated a single-mode Yb-doped fiber laser at 980nm pumped by cw and Q-switched 946 nm Nd:YAG laser. The Yb-doped fiber laser adopting two 0° fiber ends as cavity mirrors generated a cw output power of 1.32 W at 980 nm with the slope efficiency of 75.3%. The corresponding optical conversion efficiency was 66% from the incident pump power ...

ICALEO 2009 Paper #302 (Disk Laser: A New Generation of Industrial Laser)

Disk Laser: A New Generation of Industrial Laser
Authors:
David Havrilla, TRUMPF Inc.; Plymouth MI USA
Ruediger Brockmann, Trumpf Laser Gmbh; Schramberg Germany
Presented at ICALEO 2009

While the Disk laser concept was invented in the early 90s, the first industrial products were available in the beginning of this decade. Since then, the disk laser is used in mass production and serves a large variety of application fields. The output power per disk has continually increased and reached a level of 2.5 kW per disk in 2007. As of today, the disk principle has not reached any fundamental limit regarding output power per disk or beam quality. In 2009 TRUMPF released a new series of in...

ICALEO 2009 Paper #301 (Solutions for Lasers with High Brightness - A Deeper Look into Processing Heads for Welding and Cutting)

Solutions for Lasers with High Brightness – A Deeper Look into Processing Heads for Welding and Cutting
Authors:
Markus Kogel-Hollacher, Precitec Optronik GmbH; Rodgau Germany
Juergen Mueller-Borhanian, Precitec Kg; Gaggenau Germany
Christian Staudenmaier, Precitec Kg; Gaggenau Germany
Bert Schuermann, Precitec Kg; Gaggenau Germany
Brad Trees, Precitec Inc.; Wixom MI USA
Presented at ICALEO 2009

Excellent beam qualities of the latest generation of laser sources like fibre and disc lasers in the region up to 2.5mm mrad and a laser power in the region of several kW enable new possibilities in laser materials processing. These constraints put h...

ICALEO 2009 Paper #208 (Modification of the Electrochemical Properties of 2050-T8 Aluminium Alloys by a LSP Surface Treatment)

Modification of the Electrochemical Properties of 2050-T8 Aluminium Alloys by a LSP Surface Treatment
Authors:
Patrice Peyre, LALP (CRNS)/GIP Gerailp, UPR 1578; PARIS France
Vincent Vignal, ICB, UMR 5209 CNRS-Université de Dijon; - France
Hassan Amar, ICB, UMR 5209 CNRS; - France
Hongbin Song, LIM, UMR 8006 CNRS-Arts et Métiers; - France
Hervé Pelletier, LGECO, EA 3938, INSA de Strasbourg; - France
Vincent Ji, ICMMO/LEMHE, UMR CNRS 8182; - France
Presented at ICALEO 2009

2050 is a newly developed aeronautical AlLiCu aluminium alloys with numerous applications such as fuselage of civil aircrafts, and a good mechanical resistance...

ICALEO 2009 Paper #206 (Texturing Structures of Ti Films by Multiple Femtosecond Laser Pulses)

Texturing Structures of Ti Films by Multiple Femtosecond Laser Pulses
Authors:
Yongguang Huang, College of Laser Engineering, Beijing University of Technology; Beijing Peoples Republic of China
Shibing Liu, College of Laser Engineering, Beijing University of Technology; Beijing Peoples Republic of China
Presented at ICALEO 2009

Femtosecond laser texturing has proved to be a particularly powerful method for creating a wide variety of surface structures on the metal films, such as a hollow microbump-nanojet sturcture and disk-column-nanodroplet structure on the gold films. The process of femtosecond laser texturing does not rely on material removal, but on hydrodynamic flow produced ...

ICALEO 2009 Paper #205 (Laser-Generated Crack-Like Features for Fatigue Testing)

Laser-Generated Crack-Like Features for Fatigue Testing
Authors:
Elizabeth Gounaris, Connecticut Center for Advanced Technology; East Hartford CT USA
D. Cassioppo, -; -
Paul Denney, Connecticut Center for Advanced Technology; East Hartford CT USA
Presented at ICALEO 2009

For several industries including aerospace, maritime, automotive and medical it is essential to develop a cost-effective, highly-reliable method to certify damage tolerances for fatigue-critical components. To certify materials for damage tolerances, they must have precise and repeatable artificial crack initiation sites in order to accurately measure fatigue deficits. At present, accepted methods of...

ICALEO 2009 Paper #204 (Characterization and Compositional Study of Fibre Laser Processed Engineering Ceramics)

Characterization and Compositional Study of Fibre Laser Processed Engineering Ceramics
Authors:
Pratik Shukla, Loughborogh University; Leicestershire Great Britain
Jonathan Lawrence, Loughborough University; Leicestershire Great Britain
Presented at ICALEO 2009

Surface treatment by means of a CO2 laser and a fibre laser radiation was conducted on cold isostatic pressed (CIP) silicon nitride (Si3N4) and zirconia (ZrO2) engineering ceramics to observe changes in their characteristics, surface integrity, microstructure and composition. Scanning electron microscopy (SEM) was used to observe the integrity prior to and after laser processing. Energy dispersive X-ray (EDX) analysis was em...

ICALEO 2009 Paper #202 (Laser Surface Treatment of Engineering Ceramics and the Effects Thereof on Fracture Toughness)

Laser Surface Treatment of Engineering Ceramics and the Effects Thereof on Fracture Toughness
Authors:
Pratik Shukla, Loughborogh University; Leicestershire Great Britain
J. Lawrence, -; -
Presented at ICALEO 2009

Surface treatment of Si3N4 and ZrO2 engineering ceramics with a CO2 laser and a fibre laser was conducted to identify changes in the fracture toughness (K1c). Vickers macro hardness indentation tests were employed prior to and after the laser treatment to investigate the near surface changes in the hardness of the engineering ceramics. Optical microscopy was then used to observe the near surface integrity, crack lengths and crack geometry within the engineering ceramics....

ICALEO 2009 Paper #201 (Investigation into Time Dependant Degradation and Atmospheric Conditions on the Wettability of Nylon 6,6 which Has Undergone CO2 Laser Surface Modification)

Investigation into Time Dependant Degradation and Atmospheric Conditions on the Wettability of Nylon 6,6 which Has Undergone CO2 Laser Surface Modification
Authors:
David Waugh, Loughborough University; Loughborough Great Britain
Jonathan Lawrence, Loughborough University; Loughborough Great Britain
D.J. Morgan, -; -
Presented at ICALEO 2009

Although CO2 lasers have been shown to be capable of modifying the wettability of polymeric materials, it is known that the CO2 laser induced wettability modifications of these materials can degrade over time. This can be seen to be crucial from a commercial point of view as this would indicate that a shelf-life has to be establis...