LDF series (500 – 20,000 W)Technical data LDFComponents of a LDF- Laser Head- Control Unit- Cooling Unit- Operator Panel- Optics- Beam Switches

LDF series (500 – 20,000 W)


Fiber-coupled diode lasers in the LDF series offer output power from 500 W up to 20,000 W through optical fibers with 200 µm, 300 µm, 400 µm, 600 µm, 1,000 µm, 1,500 µm an 2,000 µm depending on the power level and the needs of the application.

Fiber-coupled diode lasers

In most cases, fiber-coupled diode laser heads are integrated into the compact and mobile supply unit in an all-in-one concept. In conjunction with stack and fault management, the supply unit guarantees maximum reliability in serial production. The laser system can be upgraded and adapted to different applications, for example, by adding diode laser stacks.

Multiple Station Operation

The diode lasers of the LDF series are particularly well suited to multiple station operation with beam switches and fibers of up to 100 m in length. The beam switch is integrated in the laser head and may also be added later, as customer requirements in production increase. It is equipped with an integrated status monitor and beam absorber.

Technical data LDF


Optical specification
Max. output power 3,000 W 4,500 W 6,000 W 10,000 W 15,000 W 20,000 W
Minimum beam quality 20 mm∙mrad 30 mm∙mrad 40 mm∙mrad 60 mm∙mrad 100 mm∙mrad 200 mm∙mrad
Optical fiber 400 μm

[NA 0.1]
600 μm

[NA 0.1]
400 μm

[NA 0.2]
600 μm

[NA 0.2]
1,000 μm

[NA 0.2]
2,000 μm

[NA 0.2]
Larger fibers with lower beam qualities are available, tailored to the applications
Min. focus at f = 150 mm 300 μm 450 μm 600 μm 900 μm 1.5 mm 3 mm
Fiber length 10 m, 20 m, 30 m, 50 m, 100 m and more on request
Fiber-coupling unit LLK-D/Auto, LLK-B/15 mm up to 4 kW on request
Power stability <+/- 2 % over 2 hours
Wavelength range 900 nm to 1,070 nm
 Mechanical specification
VG Power Weight approx. 600 kg, dimensions: 950 x 770 x 1,700 mm³ (L x W x H) (except at 20 kW)
VG Flex Weight approx. 800 kg, dimensions: 1,220 x 1,100 x 1,750 mm³ (L x W x H)
 Connection data
Voltage 360 – 480 V, 3 phase, PE, 50 or 60 Hz
Power connector CEE 32A-6h CEE 32A-6h CEE 32A-6h CEE 32A-6h CEE 32A-6h
Power consumption at nom. Power, approx. 11 kW 15 kW 17 kW 30 kW 40 kW 50 kW
Cooling requirements, max. 8 kW 10,5 kW 11 kW 20 kW 25 kW 30 kW
Cooling lines, tab water 19 mm inner diameter tubing with quick disconnect lines (only 20,000 W without disconnect)
External inputs Digital 24 V, analog power control 0-10 V, safety interlocks
 Operating conditions
Temperature 10 – 45 °C operational, 5 – 65 °C storage
Humidity max. 75 % @ 25 °C, with humidity protection max. 85 % @ 35 °C
Protection rating IP54
Safety class Laser safety class 4 according to EN60825-01
 Options
Interface PROFINET, Interbus-S, Profibus DP, DeviceNet, EtherNet/IP
Beam switch Time sharing or power sharing. 2 fibers (VG Power), 6 fibers (VG Flex)
Optics Laserline optics or commercial optics for every application
Other Teleservice, pilot laser, pyrometer, CCD camera, software for PC, separate control panel, dust and humidity protection, water chiller with compressor, optics chiller
 Warranty and lifetime
Warranty 5 years on diode laser elements, 2 years on all other components
Diode cooling Active for highest power density and reliability
Uptime Typically >99.5 %
  • Laser Head
  •  Control Unit
  •  Cooling Unit
  •  Operator Panel
  •  Beam Switches

Beam Source


laser-headThe beam source contains several stacks of individual diode bars. The number of bars per stack and the total number of stacks depends on the laser output power and the required beam quality. Using a straightforward, patented technology, the beams of the diodes are overlaid to form a single laser beam that is coupled into an optical fiber.

In most cases, the modular structure of the laser head allows the system to be fitted with additional stacks if extra power is needed.

Control and Supply


control-unitThe compact, mobile supply units, type LDF (VG Power, VG Flex) and LDM controls and monitors the laser head and its peripheral equipment. All components needed to operate the diode laser, including the power supply, cooling unit, and control are modular, easily replaceable components.

Mobile supply units allow new ways of thinking for location independent redundancy concepts. Thus, a separate spare laser can hedge for several production lasers in case of need. The exchange is carried out in a few minutes by trained staff and preventive maintenance or repair can be carried out without the interruption of the production.

More than 70 system data are continuously collected and processed by the system. The integrated failure management works in two stages, allowing the user to react when certain alarm limits are reached before the laser shuts down when error limits are exceeded. In conjunction with the Teleservice Hotline – more than 65% of reported malfunctions can be corrected directly – and the inherent stack management, a high availability of the diode laser system is given.

Accessories and options for diode lasers, type LDF
  • PC visualization through LL-control software
  • Wavelength selection feature e.g. for optimizing the process
  • Beam switch for up to 6 exits, e.g. the multi-station operation with multiple fiber optic cables
  • Additional unit for advanced dust and humidity protection
  • Electrical connection of external cooling devices
  • Integrated optics chiller with separate cooling circuit
  • Advanced programming features
  • Integrated laser power measurement
  • Fieldbus gateway for various protocols
Accessories and options for diode lasers, type LDM
  • Wavelength stabilization for pump applications
  • Control box for LDM
  • Pilot laser for easy visualization
  • Power meter for the manual measurement of the output power

Control and Supply


cooling-unitThe compact, mobile supply units, type LDF (VG Power, VG Flex) and LDM controls and monitors the laser head and its peripheral equipment. All components needed to operate the diode laser, including the power supply, cooling unit, and control are modular, easily replaceable components.

Mobile supply units allow new ways of thinking for location independent redundancy concepts. Thus, a separate spare laser can hedge for several production lasers in case of need. The exchange is carried out in a few minutes by trained staff and preventive maintenance or repair can be carried out without the interruption of the production.

More than 70 system data are continuously collected and processed by the system. The integrated failure management works in two stages, allowing the user to react when certain alarm limits are reached before the laser shuts down when error limits are exceeded. In conjunction with the Teleservice Hotline – more than 65% of reported malfunctions can be corrected directly – and the inherent stack management, a high availability of the diode laser system is given.

Accessories and options for diode lasers, type LDF
  • PC visualization through LL-control software
  • Wavelength selection feature e.g. for optimizing the process
  • Beam switch for up to 6 exits, e.g. the multi-station operation with multiple fiber optic cables
  • Additional unit for advanced dust and humidity protection
  • Electrical connection of external cooling devices
  • Integrated optics chiller with separate cooling circuit
  • Advanced programming features
  • Integrated laser power measurement
  • Fieldbus gateway for various protocols
Accessories and options for diode lasers, type LDM
  • Wavelength stabilization for pump applications
  • Control box for LDM
  • Pilot laser for easy visualization
  • Power meter for the manual measurement of the output power

Control and Supply


operator-panelThe compact, mobile supply units, type LDF (VG Power, VG Flex) and LDM controls and monitors the laser head and its peripheral equipment. All components needed to operate the diode laser, including the power supply, cooling unit, and control are modular, easily replaceable components.

Mobile supply units allow new ways of thinking for location independent redundancy concepts. Thus, a separate spare laser can hedge for several production lasers in case of need. The exchange is carried out in a few minutes by trained staff and preventive maintenance or repair can be carried out without the interruption of the production.

More than 70 system data are continuously collected and processed by the system. The integrated failure management works in two stages, allowing the user to react when certain alarm limits are reached before the laser shuts down when error limits are exceeded. In conjunction with the Teleservice Hotline – more than 65% of reported malfunctions can be corrected directly – and the inherent stack management, a high availability of the diode laser system is given.

Accessories and options for diode lasers, type LDF
  • PC visualization through LL-control software
  • Wavelength selection feature e.g. for optimizing the process
  • Beam switch for up to 6 exits, e.g. the multi-station operation with multiple fiber optic cables
  • Additional unit for advanced dust and humidity protection
  • Electrical connection of external cooling devices
  • Integrated optics chiller with separate cooling circuit
  • Advanced programming features
  • Integrated laser power measurement
  • Fieldbus gateway for various protocols
Accessories and options for diode lasers, type LDM
  • Wavelength stabilization for pump applications
  • Control box for LDM
  • Pilot laser for easy visualization
  • Power meter for the manual measurement of the output power

laserline_cladding_optics2

Beam switch


  • beam-switchesUp to six exits (time-sharing)
  • Efficient multi-station operation
  • Flexibility and safety
  • Integrated beam absorber
  • Internal function monitoring
  • Fast switching times
  • Bus communication