Andreas Siewert, IPG Laser GmbH, Germany AIME on High Energy Lasers, DESY, Hamburg, November 2014

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1 High Power Industrial Grade Fiber Lasers Andreas Siewert, IPG Laser GmbH, Germany AIME on High Energy Lasers, DESY, Hamburg, November 2014

2 Agenda Introduction High Power Industrial Grade Fiber Lasers 10kW Single Mode Fiber Laser (Principle, Product) 100 kw Multi Mode Fiber Laser (Principle, Product) Conclusion

3 IPG Overview Global leader in industrial fiber lasers FY 2013 sales of $648 million; YOY growth of 15% Growing acceptance of fiber lasers replacing traditional lasers Products are sold to OEMs, systems integrators and end users for use in many industries Global operations with 2,900 employees (December 2013)

4 Broad End Applications and End-Users Diverse end uses in Materials Processing Materials Processing 84% (1) For the quarter ended 12/31/13

5 Global Sales and Production Capabilities HQ, R&D, Mfg. Sales & Service 150 Sales and Marketing Headcount R&D, Mfg., Sales & Service Sales & Support Please note: IPG has 4 offices in China and 2 offices in Japan. Map excludes all rep offices 10 Application Centers worldwide

6 Vertical Integration Fab Operations Semiconductor Wafer Growth Diode Processing, Chip Mounting & Burn-In Laser diode Packaging Up to 120-watts of power Optical Preform Optical Delivery Systems: Welding & Cutting Heads, Scanners, process fibers Silica based glass MCVD method Dope with rare earth ions Deep in technology Deep in experience Fiber Draw Draw towers Components Final Assembly Coupling Final burn in Shipment Modules Up to 2000 Watts Fiber Block Bragg Gratings Isolators Couplers

7 Ytterbium Fiber 1070nm up to 10kW in SM fiber up to 30kW in 100µm fiber up to 100kW in 300µm fiber

8 Fiber laser schematic - compact design parallel pumping with LDM single mode beam quality M 2 < 1.05 mechanical robust design thermal stable no adjustment needed

9 Pump Diodes 30W CW Diode 60W CW Diode High Power LDM 30W CW 60W CW 80W CW 120W CW Fiber diameter 100µm NA < W CW Diode 80W CW Diode

10 YLS SM Maximal power: 10 kw Beam quality: Single Mode Delivery fiber: 2 m Modulation: up to 5 khz Consumption: ~ 32 kw Wall-plug eff.: ~ 32% Dimensions: 856x806x1517 mm Weight: 650 kg

11 YLS SM Output Power, W Maximal power 10,5 kw Set Current, % Output Power vs. Current

12 YLS SM Output spectrum Central Wavelength ~ 1075nm There is no non-linear limitations

13 YLS SM Modulation Up to 5kHz direct modulation demonstrated with no distortions Analog control

14 Optical schematics

15 Output power: 1,4 kw Beam quality: BPP = 0,34 mm x mrad M 2 < 1,05 Wavelength: 1070 nm Modulation: up to 5 khz H x D x W: 332 x 532 x 52 mm Weight: 11 kg Fiber Laser Module

16 Laser modules Fiber-to-fiber coupler Electrical components Layout Power supplies

17 90 laser modules (P OUT = 1,4 kw) 45 IPG power supplies (P OUT = 7,5 kw, WPE > 94%) 6 sub-combiners with elements 19-to-1 couplers 1 main combiner with coupler 7-to-1 Feeding fiber, core diameter 300 µm, length 10 m Integrated fiber-to-fiber coupler Process fiber, core diameter 500 µm, length 50 m

18 Laser cabinet Foot print: 3600 x 800 mm Height: 1860 mm Weight: 3600 kg Robust industrial design Compactness Mobility Easy to transport

19 Test setup Main problems: No available 100 kw power meters Direct BPP measurements are not possible due to high power density Solution: Beam splitter for BPP measurements 50% mirrors for power measurements

20 Test setup Portable design 2 compact boxes

21 Power measurements Output power = Summarized signals of 5 power meters

22 Output power Maximal power 101,3 kw Output Power vs. Current

23 Output power stability Power instability is ± 0,2% over 30 minutes

24 Beam quality measurements after Feeding fiber Core Diameter: 300 µm Measured BPP Value: < 16 mm x mrad Numerical Aperture: 104 mrad

25 Integrated fiber-to-fiber coupler Based on fused silica lenses with increased diameter 85 mm to decrease power density on the lenses surfaces Beam quality does not depend on the output power Stable and reliable operation at maximal power 100 kw Both feeding fiber and process fiber operation modes are available

26 Beam quality measurements Process fiber ø 500 µm Core Diameter: 500 µm Measured BPP Value: 25 mm x mrad Numerical Aperture: 99 mrad

27 Output spectrum Central wavelength ~ 1070,5 nm Linewidth (FWHM) ~ 4,7 nm There is no non-linear limitations

28 Digital modulation Up to 5 khz direct modulation demonstrated with no distortions

29 Laser characteristics Maximal power: kw Feeding fiber: 300 mm x 10 m BPP < 16 mm x mrad Process fiber: 500 mm x 50 m BPP ~ 25 mm x mrad Wavelength: 1070,5 nm Modulation: up to 5 khz Switching on / off: 40 ms / 25 ms Consumption: 286 kw Wall-plug efficiency: ~ 35.4%

30 Industrial applications Shipbuilding (mobile) cutting & welding Remote welding and cutting of large scale products in the field In field rock & concrete cutting and drilling Laser-mechanical drilling of ultra-hard rocks Heavy industry deep penetration welding & cutting Nuclear power plants decommissioning

31 60 Deep penetration welding experimental extrapolated 50 Penetration Depth mm m/min 2 m/min 3 m/min 4 m/min 6 m/min 8 m/min Laser Power kw

32 100 kw laser system: NADEX LASER R&D Center

33 Conclusions Single mode as well as multi mode lasers are build in compact design Fiber lasers can be used for mobile applications due to the robustness design Fiber lasers with highest efficiency, low operating cost No nonlinear limitation was observed up to maximal achieved power Higher power lasers would be available Customized beam quality can be offered

34 many thanks for your attention Andreas Siewert Tel.:

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