Variable Laser Beam Attenuation

  • Precise setting and maintenance of a constant laser power
  • Enhancement of the reproducibility of the laser processes

Variable Laser Beam Attenuators are mainly employed to reliably maintain a constant power output of pulsed laser beams in production processes. Typical wavelengths used are those of Eximer and Nd:YAG lasers. However, the Variable Attenuators are also suited for cw operation and other laser wavelengths.

Description and mode of Operation

Our variable laser beam attenuators consist of an attenuator plate and a compensator plate. The changes to the transmission are made by tilting the plates. The tilt angle can be set using a stepper motor or a control knob. The opposite tilt angle of the compensator plate cancels the induced beam displacement. One part of the beam goes is transmitted through the attenuator plate and the rest is reflected.

Using one attenuator plate the transmitted power can be adjusted continuously in a range of approx. 95 and 4 percent. The compensator plate may be replaced by a second attenuator plate, increasing the attainable attenuation. The transmission also depends on the polarization.