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Technical Papers
Find the latest high power diode laser technical white papers and product information to help you with your purchasing decisions.
2010-09-08
Strategies for Polymer Welding with High-Power Diode Lasers - SIMETECH, July 2010
Diode lasers have become an important tool for polymer welding in automotive industries, in medical and electronics manufacturing. High efficiency and well fitting beam quality make them a perfect tool for industrial applications. With adapted optics it is possible to fit the laser spot shape to the geometry of the work piece. Galvo scanners are the most flexible tool to apply local and precise dose of heat to the work piece. If this flexibility is not needed, the laser spot can be customized by optics to line, circular or arbitrary shaped geometries. For joining transparent parts either an absorbing layer or diode lasers with a wavelength of 1940 nm can be used. For further information, go to Scientific.net.2010-03-24
High-power diode laser modules from 410 nm - 2200 nm - Photonics West 2010
In this work we report on high-power diode laser modules covering a wide spectral range from 410 nm to 2200 nm. Driven by improvements in the technology of diode laser bars with non-standard wavelengths, such systems are finding a growing number of applications.2009-10-21
11 kW Direct Diode Laser System with Homogenized 55 x 20 mm Top-Hat Intensity Distribution - Photonics West 2007
A diode laser system with 11 kW output power at a single wavelength of 940 nm aiming for customer specific large area treatment. This is the highest output power reported so far for a direct diode laser system. In addition, to the high output power the intensity distribution of the laser beam is homogenized in both axes leading to a 55 x 20 mm² Top-Hat intensity profile at a working distance of 400 mm. Homogeneity of the intensity distribution is better than 90%. The intensity in the focal plane is 1 kW/cm².
2009-08-28
Quasi-Simultaneous Laser Beam Welding of Polymers in Closed Loop - ANTEC 2009
Polymer welding with lasers is getting a state-of-the art tool in medical device manufacturing and automotive production. Most commonly used are contour welding and quasi-simultaneous welding. An advantage of contour welding is the availability of closed-loop pyrometercontrolled processing optics. On-axis sensors are used for measuring the part's temperature. The pyrometer controller allows the storage of process data for documentation and quality analysis. The new optics developed combine the benefit of contour welding with the speed and addressability of quasi-simultaneous welding. Possibilities and limits of quasi-simultaneous closed-loop welding will be discussed with examples of industrial applications.
2009-08-27
Welding and Soldering with High Power Diode Lasers - IIW 2009
The wide range of available wavelengths, high brightness and increasing reliability are breaking new ground for diode lasers. Material processing with high power diode lasers in industrial manufacturing is getting more and more important. In automotive, medical device and also solar cell production they are important tools for automated production. Closed-loop temperature control by integrated on-axis pyrometer and fast beam deflection units are established tools for flexible processes documentation and quality control. Depending on the operating conditions, diode lasers have proven to run for several years in production nearly free of maintenance.2009-02-20
Wavelength Stabilized High-Power Diode Laser Modules - Photonics West 2009
High-power diode laser modules typically have a relatively broad spectral width of about 3 to 6nm. In addition the center wavelength shifts by changing the temperature and the driving current, which is obstructive for pumping applications with small absorption bandwidths. Wavelength stabilization of high-power diode laser modules is an important means for more efficient pumping of solid-state lasers with a narrow absorption bandwidth.
2009-02-19
High Power, High Brightness, Multi-Purpose, Laser-Head Module - AHPSL 2008
Basic concepts for high power and high brightness multi-purpose, laser-head module; modeling results, layout and design, characterization.
2008-07-22
Power Beaming with Diode Lasers - SSDLTR 2008
Improvements in the electro optical efficiency and output power of diode lasers within the last few years have made the diode laser a viable source for power beaming. Combined with a growing market of photo voltaics, the key components for power beaming applications have evolved from scientific laboratory experiments into equipment ready for deployment into the field.
2008-01-29
A Comprehensive Reliability Study of High-Power 808 nm Laser Diodes - Photonics West 2008
In the scope of the project TRUST, more than 20 aging tests have been performed on about 300 high-power laser diode bars with a variation of the mounting technology, current load, operation temperature, and operation mode. Our main goals were the improvement of the reliability and the determination of acceleration parameters for aging tests. We present selected results of long-time aging tests, acceleration factors, and thermal activation energies for high-power 808 nm laser diodes. Due to the increasing demand for higher output powers, we focus mainly on gold-tin mounted laser bars and show their great potential in comparison to the standard indium packaging technology.
2008-01-29
Diode Laser Modules Based on New Developments in Tapered and Broad Area Diode Laser Bars - Photonics West 2008
In the last few years an increasing demand for high-brightness diode laser sources is observable, which is mainly driven by applications for fiber laser pumping and materials processing. A number of different approaches have been investigated in the past for the realization of such systems. In this paper we compare different concepts for highbrightness, high-power diode laser modules that are based on the new generation of tapered diode laser bars and new developments in broad area diode laser bars, respectively.
2007-11-28
Novel High-Brightness Fiber Coupled Diode Laser Device - Photonics West 2007
High brightness becomes more and more important in diode laser applications for fiber laser pumping and materials processing. For OEM customers fiber coupled devices have great advantages over direct beam modules: the fiber exit is a standardized interface, beam guiding is easy with nearly unlimited flexibility. In addition, to the transport function the fiber serves as homogenizer: the beam profile of the laser radiation emitted from a fiber is symmetrical with highly repeatable beam quality and pointing stability.
2007-11-28
High-Brightness High-Power kW-System with Tapered Diode Laser Bars - Photonics West 2005
We report on a diode laser system, which is based on tapered diode laser bars and provides a combination of high power and high beam quality comparable to high power lamp pumped solid-state-rod lasers. Until now diode laser systems with output powers in the kW-range are based on broad area diode lasers. However, the output of these kilowatt laser systems usually is characterized by a strongly asymmetric beam profile, which is a consequence of the asymmetric beam parameter product of broad area diode lasers with regard to the slow and the fast axis direction.
2007-11-28
High Power Diode Lasers For Industrial Applications - ICALEO 2007
New wavelengths, high brightness and increasing reliability are breaking new ground for diode lasers. The higher brightness allows direct fiber coupling of several 100W in 200µm and 400µm fiber and therefore the pumping of fiber lasers. Besides pumping of solid state lasers high power diode lasers become more and more a competitive tool for many applications in material processing such as solar cell, etc.