Eliminate Drift of Laser beams with SmarAct's compact Laser Beam Stabilizer

The Laser Beam Stabilizer is a turnkey solution to actively stabilize the trajectory of a free space laser beam.

  • Beam stabilization with 4 degrees of freedom (translational and rotational)
  • Detection with two quadrant photo diodes and beam steering with two motorized mirrors
  • Also available as system with 2 degrees of freedom
  • High-speed closed-loop control with µrad-stability with SmarAct's Stick-Slip Drive Technology
  • Available with detectors for visible and NIR laser light
  • Intuitive control software

Application Examples

Introducing the Laser Beam Stabilizer (click for the full-text PDF)

With SmarAct's Laser Beam Stabilizer, a laser beam can be actively held at a fixed position and angle. Position deviations of the beam are measured with two detectors that are located at different positions along the optical beam path. These measurements are used as feedback signal for two motorized mirror mounts that control the position and angle of the laser beam.

Due to its compact size and straightforward implementation, SmarAct’s Laser Beam Stabilizer is easily integrated in existing and new optical designs.

Typical applications include:

  • Correcting of stage motion errors in delay-line experiments
  • Achieving a constant efficiency in fiber coupling applications
  • Compensating thermal drift during the warm-up phase
  • Stabilizing against mechanical vibrations
  • Minimizing displacements of laser beams that travel long distances

Working Principle 2D

In the 2D arrangement, only the translational position of the laser beam at the target position is stabilized (the target is hit in the center but the angle of incidence can vary).

To stabilize the laser beam with 2 degrees of freedom, the laser beam is sampled at 1 position. Via a beam sampler, a part of the laser beam is cast onto a quadrant photo detector. The signal from the quadrant photo diode is used as feedback signal to steer the motorized mirror mount. The actual feedback calculation is performed on the MCS2 hardware (not shown in the diagram) and ensures that the laser spot always hits the center of the quadrant photo diode. The laser beam will be stabilized at the target position when this is located at the same distance from the motorized mirror as the quadrant photo diode.

Multiple arrangements of the optical components are possible so that the system is easily adapted to existing optical designs.

 

Working Principle 4D

In the 4D arrangement, both the translational and the rotational orientation of the laser beam is stabilized (the target is hit in the center at a fixed angle of incidence).

To stabilize the laser beam with 4 degrees of freedom (translational and rotational), the laser beam is sampled at 2 positions along the laser beam. The signals from 2 quadrant photo diodes are used as feedback signals to steer 2 motorized mirror mounts. The actual feedback calculation is performed on the MCS2 hardware (not shown in the diagram) and ensures that the laser spot always hits the center of both quadrant photo diodes. This in turn ensures that the laser beam after the second mirror will have a fixed position and angle.

Multiple arrangements of the optical components are possible so that the system is easily adapted to existing optical designs.