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Projects / Programmes source: ARIS

HIGH POWER HIGHLY ADAPTABLE FIBER LASERS FOR THE INDUSTRIAL APPLICATIONS

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Research activity

Code Science Field Subfield
2.10.02  Engineering sciences and technologies  Manufacturing technologies and systems  Manufacturing technology 

Code Science Field
T165  Technological sciences  Laser technology 

Code Science Field
2.03  Engineering and Technology  Mechanical engineering 
Keywords
laser sources, fiber lasers, laser applications
Evaluation (rules)
source: COBISS
Evaluation of bibliographic research performance indicators according to ARIS methodology
Citations Citations for bibliographic records in COBIB.SI that are linked to records in citation databases
source: WoS source: Scopus source: COBISS
Researchers (38)
no. Code Name and surname Research area Role Period No. of publications
1.  32091  PhD Vid Agrež  Technology driven physics  Head  2017 - 2020  86 
2.  11905  PhD Aleš Babnik  Manufacturing technologies and systems  Researcher  2017 - 2020  103 
3.  20863  PhD Tomaž Berlec  Manufacturing technologies and systems  Researcher  2017 - 2018  351 
4.  18327  PhD Drago Bračun  Manufacturing technologies and systems  Researcher  2017 - 2018  236 
5.  06765  PhD Peter Butala  Manufacturing technologies and systems  Researcher  2017 - 2018  577 
6.  38760  PhD Luka Černe  Manufacturing technologies and systems  Researcher  2019 - 2020  19 
7.  04107  PhD Janez Diaci  Manufacturing technologies and systems  Researcher  2017 - 2020  363 
8.  29224  PhD Peter Gregorčič  Manufacturing technologies and systems  Researcher  2017 - 2019  263 
9.  03551  PhD Janez Grum  Manufacturing technologies and systems  Retired researcher  2017 - 2020  2,269 
10.  21238  PhD Matija Jezeršek  Manufacturing technologies and systems  Researcher  2017 - 2020  375 
11.  32339  PhD Blaž Kavčič  Physics  Researcher  2019 - 2020  33 
12.  20441  PhD Damjan Klobčar  Mechanical design  Researcher  2017 - 2018  564 
13.  14537  PhD Hubert Kosler  Manufacturing technologies and systems  Researcher  2017 - 2020  43 
14.  05571  PhD Janez Kušar  Manufacturing technologies and systems  Researcher  2017 - 2018  623 
15.  37513  PhD Žiga Lokar  Manufacturing technologies and systems  Researcher  2019 - 2020  37 
16.  36738  PhD Peter Lukan  Philosophy  Researcher  2017 - 2020  17 
17.  37988  PhD Bor Mojškerc  Manufacturing technologies and systems  Researcher  2017 - 2018  28 
18.  37953  PhD Jaka Mur  Manufacturing technologies and systems  Researcher  2017 - 2020  52 
19.  32338  PhD Vid Novak  Computer intensive methods and applications  Researcher  2017 - 2019  13 
20.  34413  PhD Urban Pavlovčič  Computer science and informatics  Researcher  2017 - 2019  51 
21.  36404  PhD Luca Petan  Manufacturing technologies and systems  Researcher  2017 - 2018  12 
22.  35427  PhD Jaka Petelin  Physics  Researcher  2019 - 2020  54 
23.  15646  PhD Rok Petkovšek  Manufacturing technologies and systems  Researcher  2017 - 2020  273 
24.  39916  Luka Pirnat  Manufacturing technologies and systems  Researcher  2017  8 
25.  12752  PhD Boštjan Podobnik  Physics  Researcher  2017 - 2020  62 
26.  17059  PhD Primož Podržaj  Systems and cybernetics  Researcher  2017 - 2018  201 
27.  25463  PhD Tomaž Požar  Manufacturing technologies and systems  Researcher  2017 - 2020  146 
28.  36247  Alenka Rogelj Ritonja    Technical associate  2018 - 2019  0 
29.  32082  PhD Luka Selak  Manufacturing technologies and systems  Researcher  2017 - 2018  50 
30.  31562  PhD Samo Simončič  Systems and cybernetics  Researcher  2017 - 2018  31 
31.  31251  PhD Janez Sušnik  Electric devices  Researcher  2017 - 2018  16 
32.  35440  Marko Šajn  Manufacturing technologies and systems  Technical associate  2017 - 2020  5 
33.  33467  PhD Gašper Škulj  Manufacturing technologies and systems  Researcher  2017 - 2018  52 
34.  13026  PhD Roman Šturm  Manufacturing technologies and systems  Researcher  2017 - 2018  329 
35.  02045  PhD Janez Tušek  Mechanical design  Researcher  2017  1,116 
36.  35728  Anja Vrhovec    Technical associate  2017  0 
37.  24863  Aljoša Zupanc  Manufacturing technologies and systems  Researcher  2017 - 2020  0 
38.  30568  PhD Sebastjan Žagar  Manufacturing technologies and systems  Researcher  2017 - 2018  45 
Organisations (4)
no. Code Research organisation City Registration number No. of publications
1.  0782  University of Ljubljana, Faculty of Mechanical Engineering  Ljubljana  1627031  29,214 
2.  1011  YASKAWA SLOVENIJA d.o.o., podjetje za trženje, projektiranje ter gradnjo industrijskih fleksibilnih sistemov (Slovene)  Ribnica  5386306  43 
3.  2103  LUMENTUM d.o.o. Optical Fibers  Ljubljana  1628836  43 
4.  7741  LPKF LASER & ELECTRONICS d.o.o. (Slovene)  Naklo  5711096  314 
Abstract
Due to the directing of production technologies to mass production of small series of custom-made products there is a need for precise and highly adaptable manufacturing systems. Such processes require laser processing systems that will enable fast (requires high power!) and precise spatial and temporal energy transfer to the workpiece. Modern high-power laser sources mostly meet the requirement of accurate spatial deployment very well, but not with regard to the timing and duration, especially in the case of high-speed processing that is typical for mass production. Such systems generally do not allow for very rapid changes in the parameters of the laser beam (output power, repetition frequency, pulse length), and consequently it is difficult to meet the requirement for a temporally precise transfer of energy. Research carried out in the context of the proposed project will focus on the research and development of two completely new types of laser sources. The two new laser sources are based on an original design, which allows for high flexibility of the output parameters of the laser beam:   1. Highly adjustable fiber laser for macro-processing and for use in adaptive laser processing systems with output power over 1 kW. The laser will be operating in continuous mode, in quasi-continuous mode with high frequency modulation over 100 kHz and in pulse mode, with the possibility of generating any arbitrary sequence of laser pulses with high energy and high peak power, enabling precise energy input to the workpiece. 2. Highly adjustable fiber laser for the micro-processing with a completely adjustable pulse length (in the range from 10 ns to 1 s), a very wide range of the repetition frequency (from 1 Hz to 100 MHz) and the average power in the range of several 100 W. It will be based on MOPA configuration with a specially controlled excitation source with two polarizations. Such a system will enable micro-processing at highest speed (over 1000 m/s).   Highly adjustable high-power laser will be based on gain switched ytterbium doped fiber laser. Until recently, it was considered that large average and peak powers cannot be easily achieved with gain switched one stage systems. Researchers of the project team have already shown that this type of lasers in spite of its simplicity provides many advantages over the classic design fiber and solid-state lasers. They showed that such lasers exhibit excellent stability of output power, regardless of the repetition of output pulses, and demonstrated record peak power (about 2 kW) and average power (about 40 W), which until now have not been exceeded. In order to reach the average power in the range of 1 kW it will be necessary to research and develop this type of laser completely from start. The concept is based on the modified temperature regime of the fiber laser operation, which will enable the achievement of significantly higher energies of individual laser pulses and enable efficient operation even in continuous mode. The key for the successful implementation is the new technology, which is mastered by a partner company Optacore. It is a specific active fiber manufacturing process, which allows operating the fiber at very high temperatures (over 300 °C). Classical active optical fibers can operate up to a maximum of about 100 °C. The entire project team has extensive knowledge and experience in the research field of new laser sources, as well as micro and macro processing. Both fields are covered by the researchers coming from academia and from the industry. This fact allows for organizing the project in such a way that there will be close collaboration between the researchers who will work on the research of the laser sources and the researchers who will work in the field of testing the use of lasers. In this way it will be possible to directly obtain feedback regarding the desired and optimal parameters of laser sources and thus greatly increase the effectiveness of the research.
Significance for science
In the framework of the project research and development of portable continuous and quasi-continuous laser sources with high output power will be carried out, together with potential applications associated with them. Key innovations in professional and scientific fields will be the following: Research and development of new types of active optical fibers, which allow high-temperature operation of the laser. This will presumably constitute a breakthrough in the field. A significant contribution from the scientific point of view will be in the fact that the research will focus on adapting the cross-section for stimulated emission, on changing the shape of the emission spectrum of the ytterbium, on the control of the formation of color centers and photo-darkening based on the temperature control of the active fiber. Through the experimental setup of an innovative type of fiber laser for adaptive machining processes that can simultaneously operate in continuous mode with the power of 1 kW or more, in quasi-continuous mode with frequency modulation about 100 kHz and in pulse mode with high peak power in the range of 10 kW new methods of machining processes will be explored. This will be made possible by new type of laser and applicable in laser coating, welding, cutting and hardening. In the context of the laser source described above, the researchers will explore a new way of pulsed pumping of fiber lasers for macro machining with a view to achieving a sequence of pulses with gain switching. In doing so, the possibility of temperature control of gain-switched lasers as the additional parameter for adjusting the laser pulse will be investigated. Using the above approaches, we expect to achieve record values of both peak power (approx. 10 kW) and average power (100 W) output in this mode of operation of fiber lasers for the case of a simple single-stage system. A new type of quasi-continuous high-power fiber laser (100 W) will be constructed, with small amplitude of transient fluctuations in the fast power switching mode, with high contrast and without optical modulators, optimized for micromachining.   In the framework of work package 7 (WP 7) the research team will appropriately disseminate the new results through publications in journals, attending conferences and hosting researchers from related areas of work of the EU Member States.
Significance for the country
The results of the laser sources research, as well as other new scientific and technological results that will incurred during the implementation of the project will enable participating organizations to introduce a number of technological innovations in their programs. Adaptability and compactness of the laser sources should be mentioned, which will contribute to the competitiveness of processing systems (important for Slovenian producers of laser processing systems such as: LPKF, Yaskawa, Fotona ...). Since the solutions will be based on the new electronic controllers and optical fibers, it is expected that energy efficiency of these lasers will be exceptionally high. This will be a significant contribution to reducing the energy consumption of laser machining systems, potentially reducing the impact on the environment. Based on the results of the project the company LPKF plans to extend its product range to the high power laser sources, based on optical fiber technology. The company will thus be able to strengthen its presence in the very promising area of ??industrial micro-machining. For such applications laser sources with adjustable repetition frequency and duration of the output pulse will be of particular interest. These types of lasers will facilitate operation of high power laser, which will be of utmost importance for future generations of laser systems in this area, where due to the high processing speeds (over 100 m/s) high average power as well as high repetition speed will be required. Company Optacore is currently already very well established as a manufacturer of equipment for the manufacture of passive optical fibers. In the future, the company wants to enforce its presence in the rapidly developing field of active optical fibers for high power, which require some specific knowledge and equipment that is already available to the applicant of this project (UL FS). Company Optacore expects that the development and production of active optical fibers for high-power fiber lasers, which enable high-temperature operation, will represent an excellent reference for their equipment for the manufacture of optical fibers. This would in future allow them a breakthrough to a completely new market, where until now they were not present and thus improve their chances on the global market. Especially interesting for the company Yaskawa will be the high power fiber laser operating in continuous mode and quasi-continuous mode which will be developed within the project. Its characteristics will be significantly improved compared to the competing commercially available sources mainly due to smaller dimensions, the modular structure and the high flexibility of the laser parameters. This represents a significant market advantage in laser processing using robots, such as laser welding and cutting, which represent an important part of the firm's policies.
Most important scientific results Interim report, final report
Most important socioeconomically and culturally relevant results Final report
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