Laser Beam Quality, M² Measurement, NIR Low Divergence

Manufacturer's part number :


Manufacturer Coherent


Description :

The ModeMaster MM-3 Ge beam profiler measure the laser beam quality M² factor and beam propogation. The ModeMaster MM-3 model PC head is a dual-knife-edge Germanium (800nm to 1800nm) beam profiler integrated with a diffraction-limited precision scanning lens, which is translated along the beam propagation axis. The NIR low divergence lens focuses the beam to create an internal beam waist, and the two orthogonal knife edges (X and Y), which are mounted on a rotating drum, measure the beam diameter and beam axis location at 256 planes along the beam waist as the lens is translated. The powerful ModeMaster PC software then derives the M2 factor, the size and location of the beam waist, the far-field divergence angle, the pointing direction, astigmatism and asymmetry, and the Rayleigh range.

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  • Quote and availability


  • Spectral range: 880 nm to 1800 nm
  • Detector: Germanium
  • Power: 2.5mW min / 2.5W Max
  • Waist Diameter: ±2%
  • Waist Location ±8% of input beam Rayleigh Range
  • Beam Quality: M2 ±5%
  • Divergence: ±5%
  • Beam Translation ±5% of waist diameter +0.1 mm
  • Pointing Angle ±5% of divergence +0.04 mrad
  • Azimuth Angle Readout ±2°(10 to 200°)
  • Benefits

  • Measurement and display of CW laser divergence, M2 (or k) and astigmatism
  • Beam sizes 0.2 mm to 25 mm
  • Wavelengths from 800 nm to 1800 nm
  • Determination of waist location and diameters (including D4σ diameter) and Rayleigh range
  • Angular and translational beam-pointing stability