scholarly journals High power narrowband 589nm frequency doubled fibre laser source

2009 ◽  
Vol 17 (17) ◽  
pp. 14687 ◽  
Author(s):  
Luke Taylor ◽  
Yan Feng ◽  
Domenico Bonaccini Calia
Keyword(s):  
High Power ◽  
Laser Source ◽  
Fibre Laser

High-Power Fibre Lasers – Application Potentials for Welding of Steel and Aluminium Sheet Material

2005 ◽  
Vol 6-8 ◽  
pp. 171-178 ◽  
Author(s):  
Claus Thomy ◽  
Thomas Seefeld ◽  
Frank Vollertsen
Keyword(s):  
High Power ◽  
Welding Speed ◽  
Beam Quality ◽  
Sheet Material ◽  
Laser Source ◽  
Fibre Laser ◽  
Energetic Efficiency ◽  
Fibre Lasers ◽  
Aluminium Sheet ◽  
Compact Size

Latest developments in laser physics have enabled the production of high-power fibre lasers with beam powers up to 10 kW at excellent beam quality. Adding to these properties their high energetic efficiency, their considerable estimated lifetime and their compact size, they might well be considered to be a viable alternative to both conventional lamp- or diode-pumped Nd:YAGas well as to CO2-Lasers. However, due to the novelty of the system, very few experiences on their usability for materials processing and in special for welding of steel and aluminium sheet material are existing. To help this situation, a 7 kW high-power fibre laser system was tested at the Bremer Institut fuer angewandte Strahltechnik, and its potentials for welding steel and aluminium sheets have been assessed. By these results, of which a selection is presented here, it could indeed be demonstrated that it is possible to remarkably enhance process limitations considering welding speed and sheet thickness previously regarded to be inevitable when welding with solid-state lasers. Consequently, in July 2004 the first high-power fibre laser with a beam power exceeding 10 kW at a BPP of less than 12.5 mm*mmrad was tested in cooperation with SLV M-V Rostock. This laser source is currently used for developing mainly welding, but also cutting and cladding applications for a variety of industries. Within these studies, it was e. g. demonstrated that it is possible to achieve a penetration of 10 mm in EN-AW 6082 at a welding speed of 3 m/min.

High power neodymium-doped single transverse mode fibre laser

1993 ◽  
Vol 29 (17) ◽  
pp. 1500 ◽  
Author(s):  
H. Po ◽  
J.D. Cao ◽  
B.M. Laliberte ◽  
R.A. Minns ◽  
R.F. Robinson ◽  
...  
Keyword(s):  
High Power ◽  
Transverse Mode ◽  
Fibre Laser ◽  
Mode Fibre

Propagation of high-power partially coherent fibre laser beams in a real environment

2011 ◽  
Vol 20 (9) ◽  
pp. 094208 ◽  
Author(s):  
Ru-Mao Tao ◽  
Lei Si ◽  
Yan-Xing Ma ◽  
Yong-Chao Zou ◽  
Pu Zhou
Keyword(s):  
High Power ◽  
Laser Beams ◽  
Fibre Laser ◽  
Real Environment ◽  
Partially Coherent

High-Power Broad Area Laser Diode with Internal Wavelength Stabilisation at 975 Nm for Yb Fibre Laser Pumping

2014 ◽  
Author(s):  
M. Krakowski ◽  
M. Lamponi ◽  
O. Drisse ◽  
A. Larrue ◽  
M. Lecomte ◽  
...  
Keyword(s):  
Laser Diode ◽  
High Power ◽  
Fibre Laser ◽  
Broad Area ◽  
Laser Pumping

A high-power electro-absorption modulated 2d-array laser source for FM/cw scannerless lidar

2010 ◽  
Vol 31 (1) ◽  
pp. 91-97
Author(s):  
Lu Wei ◽  
Jiang Peng ◽  
Qi Wang ◽  
Han Liming
Keyword(s):  
High Power ◽  
Laser Source ◽  
2D Array

Experimental Investigation of High Power Erbium–Ytterbium Co-doped Double Clad Fibre Laser

2004 ◽  
Vol 21 (12) ◽  
pp. 2426-2428 ◽  
Author(s):  
Li Li-Jun ◽  
Feng Xin-Huan ◽  
Liu Yan-Ge ◽  
Li Yao ◽  
Yuan Shu-Zhong ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
High Power ◽  
Fibre Laser ◽  
Co Doped

Laser Lock-In Thermography for Fatigue Crack Detection

2013 ◽  
Vol 558 ◽  
pp. 76-83 ◽  
Author(s):  
Yun Kyu An ◽  
Ji Min Kim ◽  
Hoon Sohn
Keyword(s):  
Fatigue Crack ◽  
Heat Source ◽  
High Power ◽  
Crack Detection ◽  
Laser Source ◽  
Cw Laser ◽  
Laser Heat ◽  
Laser Heat Source ◽  
Fatigue Crack Detection ◽  
Lock In

This study proposes a new nondestructive evaluation methodology named laser lock-in thermography (LLT) for fatigue crack detection. LLT utilizes a high power continuous wave (CW) laser as a heat generation source for lock-in thermography instead of commonly used flash and halogen lamps. The advantages of the proposed LLT method are that (1) the laser heat source can be positioned at an extended distance from a target structure thank to the directionality and low energy loss of the laser source, (2) thermal image degradation due to surrounding temperature disturbances can be minimized because of high temperature gradient generated by the laser source and (3) a large target surface can be inspected using a scanning laser heat source. The developed LLT system is composed of a modulated high power CW laser, galvanometer and infrared camera. Then, a holder exponent-based data processing algorithm is proposed for intuitive damage evaluation. The developed LLT is employed to detect a micro fatigue crack in a metal plate. The test result confirms that 5 μm (or smaller) fatigue crack in a dog-bone shape aluminum plate with a dimension of 400 x 140 x 3 mm3 can be detected.

scholarly journals High-power, high repetition-rate, ultrafast fibre laser based source of DUV radiation at 266 nm

OSA Continuum ◽  
2018 ◽  
Vol 2 (1) ◽  
pp. 99 ◽  
Author(s):  
A. Srinivasa Rao ◽  
N. Apurv Chaitanya ◽  
G. K. Samanta
Keyword(s):  
High Power ◽  
Repetition Rate ◽  
High Repetition Rate ◽  
Fibre Laser ◽  
High Repetition

A high power hybrid mid-IR laser source

2010 ◽  
Vol 283 (20) ◽  
pp. 4041-4045 ◽  
Author(s):  
Alexander Hemming ◽  
Jim Richards ◽  
Shayne Bennetts ◽  
Alan Davidson ◽  
Neil Carmody ◽  
...  
Keyword(s):  
High Power ◽  
Laser Source ◽  
Ir Laser

Multi beam microprocessing for printing and embossing applications with high power ultrashort pulsed lasers

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Stephan Bruening ◽  
Arnold Gillner ◽  
Keming Du
Keyword(s):  
High Power ◽  
Average Power ◽  
Ablation Rate ◽  
Friction Reduction ◽  
Laser Source ◽  
Limiting Factor ◽  
Functional Surface ◽  
Roll To Roll ◽  
Micro Patterning ◽  
Tool Diameter

Abstract Micro structuring of surfaces is of great interest for various applications, e.g. for the tooling industry, the printing industry and for consumer goods. In suitable mass production applications, such as injection molding or roll-to-roll processing for various markets, the final product could be equipped with new properties, such as hydrophilic behavior, adjustable gloss level, soft-touch behavior, light management properties etc. To generate functionalities at reasonable cost, embossing dies can be augmented with additional micro/nano-scale structure using laser ablation technologies. Despite the availability of ultrashort pulsed (USP) high power lasers (up to several hundred watts), it is still a challenge to structure large areas, as required on embossing rolls, in an acceptable processing time for industrial production. In terms of industrial implementation, direct digital transfer is a limiting factor for ultrahigh resolution. Shorter machining times by further increasing spot or workpiece motion are limited. Enlarging the ablation diameter, and thus the tool diameter, delivers a higher ablation rate with the comparable ablation quality, but entails a reduction in resolution. While maintaining the achieved state-of-the-art performance, upscaling of single modulated lasers provides a less demanding way to increase productivity. In the processing of steel surfaces, an increase in material removal can also be achieved by using pulse burst. In this work, the parallel process of single modulated multi laser sources is compared with a laser source split by diffractive optical elements (DOE) for applications in a cylinder micro patterning system. A newly developed highly compact ps laser with repetition rates up to 8 MHz and an average power of 300 or 500 W was divided into 8 or 16 parallel beamlets by a DOE. The ablation rate of each approach was investigated by typical microstructures on copper surfaces. At surface speeds of 10 m/s and a resolution of 5080 dpi, an ablation rate of up to 27 mm³/min was achieved. Different functional surface geometries were realized on an embossing roll as master, which is used for replication of the structures in roll-to-roll processes. Functional structures, such as friction reduction, improved soft touch or light guiding elements on large surfaces are demonstrated.

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