Laser in Vacuum (LaVa) - Technology

Laser in Vacuum supports supreme metallurgical properties of molten material

Laser Beam Generation - Principle

A laser emits a beam of electromagnetic radiation that is monochromatic, collimated and coherent. Lasers consist of three main components: 
– a pumping source: supply of stimulating energy

– laser medium: solid, liquid or gas

– an optical resonator: fully reflective mirrors and partially reflective mirror, which enables emission of beam.

Generation of Laser Beam Scheme of Principle / Source: Sciencedirect
Generation of Laser Beam Scheme of Principle / Source: Sciencedirect

Spatial coherence allows tight focusing of a laser and the beam stays parallel over great distances:

this is called “collimation”.

Temporal coherence emits light pulses in ultrashort femtoseconds with a very narrow wavelength spectrum, i.e. a single color of light.

Generation of Laser Beam / Source: Springer
Elektronenstrahlboren Beispiel / Quelle: Evobeam

Laser in vacuum machining requires requires ≤ 100 mbar in the working chamber. The picture sequence below  shows the impact of vacuum pressure on spatter behaviour.
Often only a single forepump can evacuate the chamber. The vacuum chamber and its designed cnfines the laser beam and potential reflections reliably in order to meet the safety requirements.


Evobeam’s laser in vacuum machining systems use pumps that minimize the evacuation time to increase productivity and production rates.

Impact of vacuum conditions on spatter with laser beam machining.

Laser im Vakuum

                              p= 1013 mbar                             p= 500 mbar                          p= 100 mbar                              p= 10 mbar

Laser in Vacuum fields of application

Most common laser in vacuum applications are welding and cladding.

Laser in Vacuum Welding / LaVa Welding

Electron Beam Weld Seams

As compared to atmoshperic pressure, Laser in Vacuum Welding can create much deeper and narrower seam with minimized heat input into the metal.

Warpage of the workpiece is significantly reduced or even avoided.

Applicable for magnetic materials as well.

Laser in Vacuum Cladding / LaVa Cladding

Laser in Vacuum Cladding

Laser in vacuum cladding technology enables precise control of layer properties with low heat input into the base material.

Laser in Vacuum - Systems & Options

Versatile range of laser in vacuum machining solutions supported by our scope of services