Raw Beam Measurement

Direct measures the power density distribution of a focus geometry   

The LaserQualityMonitor (LQM+) is a perfect measurement system for the characterization and qualification of the beam propagation of lasers in the range of UV to NIR. 

Typical areas of application are:   

  • Laser and system development 
  • Quality assurance in production of laser sources 
  • Simplifies service and maintenance 

Determine beam propagations, analyse faults  

The LaserQualityMonitor LQM+ offers an integrated solution for the quick and straightforward analysis of the beam properties of a beam source. The beam propagation of lasers from the UV to NIR range are characterised and certified with this measuring system. Furthermore, errors in the optical structure of resonators of beam imaging systems can easily be analysed. 

This PRIMES innovation directly measures the power density distribution of a focal geometry that was created by integrated focusing optics. That makes this system unique in the market.    

Advantage of this measurement method: Disturbances from diffraction structures, misalignment, asymmetries and other effects become directly visible in the measured power density distributions. 

Compact, simple, individually expandable   

The LQM characterises the parameters of a beam source automatically and quickly in conformity with ISO standard 11146. This is a compact and easy-to-align measuring system which is positioned directly in front of the laser to be measured and is aimed at the laser beam. The LQM essentially consists of a basic system in which all optical components and measurement functions are completely integrated. The base device can be supplemented by front-end modules with beam splitters, absorbers and alignment units and its power potential increased into the multi-kilowatt range. Fibre holders, collimators, neutral density glass filter inserts and additional measurement optics are available if needed. Furthermore, integrated measuring stations can be supplied as custom solutions. 

Measured beam parameters   

  • Beam waist diameter / beam dimensions   
  • Waist position / focal position with reference to the beam entry into the LQM  
  • Beam radius  
  • Far field divergence  
  • Rayleigh length  
  • Divergence 
  • Beam propagation factor k 
  • Diffraction index M²

The Features of the LQM+ 

  • Accelerated measurement 
  • Completely automated caustic scan 
  • Operation and presentation with the new PRIMES LaserDiagnosticesSoftware
  • Optionally avabilable for up to 20kW
  • Optionally available with new internal objective allowing up to 30mm x mrad

 

Subject to change without notice.

Raw beam diagnostics of Co2 lasers and ideal for intergration into material processing system and for use in servicing   

The BeamMonitor BM-HQ replaces the typical plexiglass burns used to identify the beam profile or beam symmetry. The diagnostic device enables quick measurement with high precision. This is guaranteed by a detector with a high dynamic range.  The mechanical scanning system measures the power density of collimated laser beams at full power. The BM-HQ has been used successfully for a number of years and it is the perfect device for analysing your laser beam.

Due to its compact design and light weight, the BeamMonitor BM-HQ is ideal for integration into material processing systems and for use in servicing.

Typical areas of application are:   

  • Laser and system development 
  • Quality assurance in production of laser sources 
  • Simplifies service and maintenance 

Determine Wear and Deviations   

The geometric data, beam symmetry and power density distribution can indicate the optical quality. Its absorption and dirt contamination level as well as alignment problems, should checked regularly.

Change of optics is often due to the unavoidable pollution of the surfaces of the optical components or inadequate cooling. Especially in the case of transmission components such as output coupling windows or beam splitters. The dirt contamination results in higher absorption and thus creates thermal lensing. This influences beam diameter and beam divergence.

With the BM-HQ, the user is able to measure beam parameters quickly and reliably.

The Principle   

The laser beam is scanned point by point with a rotating measuring tip. The mirror mount is also moved in a linear fashion to scan the entire beam profile. In this way, a partial beam is diverted and directed at the detector in each instance.

The incoming signal is digitised and transmitted to the evaluation unit. The 14-bit A/D converter and resolution of up to 256 x 128 pixels employed enable an exact analysis even of small disturbances in the raw beam. The device was designed for use in harsh industrial manufacturing conditions, and is adaptable in every spatial orientation.

The software has the following standard functions:

  • Measurements: single measurments, series measuremtns (monitor operation), and measurment of chronological development (linescan)
  • Displays: isometry, fales colors, contour lines and display of numeric results
  • Data saved in *.foc or ASCll file format

During the measurment, the entire beam exites the BeamMonitor and must be absored as completely as possible.

Measured beam parameters   

  • Beam position   
  • Beam dimension   
  • Beam summerty   
  • Power density distribution 

The device is operated from a PC. This enables the entire power density distribution to be represented within a few seconds. With an Ethernet connection, a maximum repeat frequency of 0.4 Hz is possible.

With the line scan function that is optionally available, the BM-HQ works at a repetition rate of around 30 Hz.

Subject to change without notice.

Performing beam diagnostics on unfocused, continuous irradiation of Co2 and solid-state lasers with higher outputs   

The BeamMonitor (BM+) is the new verson of BeamMonitor and now possesses electronics prepared to meet the current and further demands of signal processing. BM+ can quickly and reliably measure the beam parameters, such as the power density distribution. Analysing and documenting the laser parameters makes it possible to optimize the processing procedure or identify an incorrect beam position or lens alignment.

Typical areas of application are:   

  • Laser and system development 
  • Quality assurance in production of laser sources 
  • Simplifies service and maintenance 

Determine Wear and Deviations   

In practice, laser beams are “customized” for specific areas of application using telescopes and adaptive lenses. When this happens, the beam diameter as well as the divergence are changed dynamically. This makes it possible to change the focus dimensions or shift the focus position toward the laser beam axis in systems for laser cutting or laser welding. Here the focus is on “penetration” through the material surface and it is “pushed into” the material for the actual cutting process. 

During laser welding, dynamic adjustments of the laser beam make it possible to cut with one setting and weld with another.

The BM+ is also suitable for use in the field of quality assurance or laser approval: Deterioration on laser lenses is one of the main causes of problems in laser material processing that can reduce the quality of the processing results considerably. Diodes and other solid-state lasers are checked in the collimated range and can, for example, be assessed with relatively little effort.

Easy Operation   

The new PRIMES LaserDiagnosticsSoftware LDS can be used as a graphic interface for operating the BeamMonitor BM+. This software contains a wide variety of tools for analysis, display, and preparation of measurement data, including a report function.

The software has the following standard functions:

  • Beam measurment 
  • Beam position 
  • Measurements: single measurments, series measuremtns (monitor operation), and measurment of development over time(linescan)
  • Displays: isometry, fales colors, contour, line presentation and display of numeric results
  • Data storge in PRIMES format .lpf as well as CSV and export graphic

Measured beam parameters   

  • Beam position   
  • Beam dimension   
  • Beam summerty   
  • Power density distribution  

Diverse models & options 

  • BeamMontior BM+60
  • BeamMonitor BM+100 
  • Optionally available for Co2 or NIR lasers
  • Depend on the beam size & gemontry, available with apertures of 60 or 100 mm

The aperture should be at least 1.4 times the laser beam diameter. This ensures that the intensities on the edges do not come in contact with the BM+ casing, the measuring range is not unnecessarily limited, and/or a distorted measuring is not produced.     

Subject to change without notice.