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Low Noise Laser Macro Focus Generator LNC-13MM+56CR

Low noise laser spot with extended depth of focus

The new low noise laser diode modules from Schäfter+Kirchhoff have reduced power noise, reduced coherence length and low speckle contrast as a result of internal RF-modulation. The low noise (< 0.1% RMS, @<1 MHz) and the mode-hopping free laser operation makes these laser diode modules ideal for particle measurements or advanced medical and biotechnological applications. Due to the reduced coherence length, speckle contrast might be lowered. This effect, however, becomes smaller for smaller spots.

Performance Features

  • Low noise laser module (<0.1% RMS,@<1 MHz)
  • Reduced coherence
  • Mode hopping free laser operation
  • Circular beam profile
  • Gaussian intensity profile
  • Focus Ø starting at 19 μm
  • Integrated focussing mechanism
  • Spectral range 405–980 nm
  • Laser power up to 33 mW
  • External modulation: TTL up to 100 kHz and analog up to 100 kHz
  • Output power adjustable <1 –100 %
  • Supply Voltage: 5V DC

Laser macro focus generators of type 13MM…+56CR generate a circular laser spot and have integrated electronics that can be modulated externally. The beam shaping optics define the optimum working distance and the focussing range. The chosen laser module determines the wavelength and the output power and, thereby, the laser safety class.

The spot diameters listed in tables below are valid for the nominal working distance of the micro focus optics. Any working distance changes require refocussing within the available focussing range, with the spot diameter increasing in direct proportion with the greater working distance.


Schäfter + Kirchhoff GmbH - specialists for optical sensors and measurement technology
Kieler Str. 212, D-22525 Hamburg, Tel. +49(0)40 85 39 97-0, Fax +49(0)40 85 39 97-79