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The HighPower-LaserQualityMonitor (HP-LQM) quickly and automatically characterises the beam parameters of a beam source. The measuring system is compact, easy to align and can be expanded individually.

Determine beam propagations, analyse faults
With the High-Power-LaserQualityMonitor (HP-LQM), PRIMES offers an integrated solution for quickly and simply analysing the beam properties of a beam source. In combination with the collimator available from PRIMES, the measuring system determines the beam propagation of fibre lasers and fibre-guided beam sources.

Both alignment of the coupling into the fibres and the identification of faults and impurities in the optical set-up are made significantly easier with the HP-LQM.

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 HP-LQM characterises the parameters of a beam source in conformity with ISO standard 11146 automatically and quickly. This is a compact and easy-to-align measuring system which is connected directly to the fibre to be measured. The HP-LQM essentially consists of a basic system in which all optical components and measurement functions are completely integrated. The basic device is supplemented in the HP-LQM by front-end modules with beam splitters, absorbers, alignment units and collimators.

Fibre holders, collimators, neutral density glass filters and additional measurement optics are available if needed. Furthermore, integrated measuring stations with Class 1 lasers can be supplied as custom solutions.

Measurement methods – the principle

The detailed characterisation of fibre-guided laser sources in respect of beam quality, divergence, beam direction and power cannot generally be carried out without a significant effort and the use of several set-ups.

The HP-LQM with collimator collimates the laser beam propagating divergently from the fibre, reduces the power in two adapted water-cooled attenuators, and directs the measurement beam into the LQM. In combination with a PowerLossMonitor, the irradiated laser power can be measured in parallel via the laser power coupled out to the attenuators and the resulting temperature increase in the cooling medium.

The optics installed in the aperture of the HP-LQM focus the incoming collimated beam in the device. The focused beam is displayed enlarged on the CCD chip via several integrated attenuators and a lens. From the two-dimensional power density distribution measured in this way the LaserDiagnosticsSoftware determines the radius, position and orientation of the beam. Through the procedures of this measurement system, and repetition of the measurement at various positions in the device, all parameters necessary for the description of the artificial caustic are determined. The electronic exposure time control of the CCD chip expands the dynamic range of the system. This means that in general it is not necessary to change the filter during measurement.

By the laser beam being thus focused and characterised, the measurement can be shortened from several metres to a few millimetres. The M²-value can be easily determined in this fashion, since it is ensured that the optics used for focusing do not generate imaging errors which influence the beam to be measured. The values of the beam parameters of the focused laser beam are calculated back to the values of the collimated beam in accordance with ISO 11146.

Measured beam parameters

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

Two alternatives for use

Two alternatives are available for the operation of the HP-LQM:

  1. The PC-based LaserDiagnosticsSoftware LDS makes it possible to measure the beam distribution manually and semi-automatically and to determine the beam position and beam dimensions.
  2. Scripts semi-automatically control the HP-LQM, for example for repetitive measurement problems in servicing, quality assurance and acceptance inspection. They are individually adapted to the current measurement process. Advantage: Through programmed user management the requirements for operating the HP-LQM can be significantly reduced.

Data transfer to the PC is performed via Ethernet (100 MBit).

Models and options

  • Power measurement on the absorber
  • Crimp holders for collimators with 35, 40 and 50 mm outer diameter
  • Collimator with 67 mm focal distance up to 6 kW and fibre connector LLK D and also QBH
  • Measurement optics 1:1 and 5:1
  • wavelength range 1030 – 1090, 515 – 545 and 340 – 360 nm
  • Neutral density glass filters OD1, OD2, OD3, OD4, OD5