Active Laser Beam Stabilization

Adjustment, stabilization, positioning and alignment of laser beams

We offer systems for the real-time stabilization, alignment, positioning and adjustment of laser beams. Our systems are extremely precise, fast and very stable. User interactions are not required. They are equipped with useful operation and safety features for a fast integration into different laser setups.

With our beam stabilization systems the laser is always stabilised in the desired target position and beam direction. Please don't hesitate to contact us. We are looking forward to assist you in selection, planning and integration.

Typical applications

  • Very precise, fast and reliable beam alignment
  • Active beam position and beam direction control
  • Compensation of laser beam pointing
  • Precise motion and vibration control
  • Automated adjustment of laser beams
  • Fast delivery of laser beams to changing applications
  • OEM solutions: e.g. inline precision control in laser materials processing

Stand-alone system for an easy installation to the laser beam path. It is characterized by its straightforward handling and integration. The Compact system leads to a reliable and very precise beam position and direction stability and it compensates disturbances. The Piezo actuated mirrors can placed at positions of existing mirrors of the setup.

Features

  • Active closed-loop control
  • Analog system core for highest control performance with lowest phase-shift
  • Highest resolution without digitizing steps
  • No user interactions required, no need for a computer
  • USB interface (RS232) and software available
  • Precise positioning of cw and pulsed lasers
  • Also applicable for ultrashort pulsed lasers (ps, fs)
  • OEM versions available
  • Excellent price performance ratio

Detectors for the "Compact" system

All our detectors are deveoped for the perfect combination with the "Compact" system. We can offer the ideal detector for each application and laser. Our most common models are shown below. Further information and details can be found in "Options and Accessories".

vis 4QD detector

  • System detector with Si 4-quadrant diode
  • Wavelengths: 320 - 1,100 nm
  • Active sensor area: 10 x 10 mm2
  • Lateral resolution: < 100 nm possible
  • Bandwidth: up to 100kHz

vis PSD detector

  • System detector with position sensitive device sensor (PSD)
  • Wavelengths: 400 - 1,100 nm, also available with 200 - 1,000 nm
  • Continuous sensor area
  • Electronic shifting of laser target position possible
  • Position measurement independent of beam diameter

  • Large dynamic range (factor >1000), reliable detection even with changing laser intensities
  • Logarithmic signal amplification
  • Signal-to-noise ratio constant over the whole intensity range
  • For wavelengths, lateral resolution and bandwidths see vis 4QD detector

UV 4QD detector 3x3

  • System detector with Si PIN 4-quadrant diode
  • Wavelengths: 190 - 1,100 nm
  • Active sensor area: 3 x 3 mm2
  • Lateral resolution: < 100 nm possible
  • Bandwidth: up to 100 kHz

IR 4QD detector (InGaAs)

  • System detector with InGaAs 4-quadrant diode
  • Wavelengths: 900 - 1,700 nm
  • Active sensor area: 3 mm diameter
  • Lateral resolution: < 100 nm possible
  • Bandwidth: up to 100 kHz

IR 4QD detector (Ge)

  • System detector with Ge 4-quadrant diode
  • Wavelengths: 800 - 1,800 nm
  • Active sensor area: 5 mm diameter
  • Lateral resolution: < 100 nm possible
  • Bandwidth: up to 100 kHz

  • System detector with Thermopile 4-quadrant sensor
  • Wavelengths: 190 nm - 15 µm
  • For beam stabilization of e.g. CO2 and quantum cascade lasers
  • Active sensor area: 18 x 18 mm2

Actuated mirrors for the "Compact" system

We offer different mirror actuators for the Compact system:

  • Highest positioning accuracy and speed due to Piezo technology
  • Resonance frequency > 700 Hz
  • Tilting range: 1 mrad mechanical, 2 mrad optical
  • For 0.5 and 1 inch mirrors
  • Detector can be placed behind the actuated mirror

  • Highest positioning accuracy and speed due to Piezo technology
  • Resonance frequency > 840 Hz
  • Tilting range: 2 mrad mechanical, 4 mrad optical
  • For 1, 1.5 and 2 inch mirrors
  • Detector can be placed behind the actuated mirror

  • Recommended for larger mirrors
  • Highest positioning accuracy and speed due to Piezo technology
  • Resonance frequency up to 1,200 Hz
  • Tilting range: 4 mrad mechanical, 8 mrad optical
  • For 1, 1.5, 2 and 3 inch mirrors

  • Our "Compact" system can also control actuators for larger mirrors
  • The image shows a Piezo actuator with a 4 inch mirror

The "Compact" system can be used in vacuum applications. Thus we offer vacuum versions of the detectors and actuators. These components can be used down to a vacuum pressure of 10-11 mbar.

Laser shutter

The laser shutter system "Beamblock" is designed for the combination with the beam stabilization system, but can also be used independently. It consists of a laser shutter and a shutter control unit that enables different operation modes (external, confirm, manual). For further specification of the shutter and the shutter control unit see the user manual.

Beside the standard laser shutter we can also offer customised items. As an example, a miniature shutter is shown on the image below. It can be used if only limited space is available.

Further product information

These detectors with integrated signal processing determine laser fluctuations with highest spatial and temporal resolution. The measuring principle allows for the inspection of single laser pulses. Thus, the position detectors enable the characterization and quality assurance of lasers. The detectors are equipped with LED displays for power level and x and y position.

The measurement bandwidth can be >100kHz. For further specifications see the user manuals.

Further product information

The working principle of our beam stabilization is shown in the figure: Actuated mirrors adjust the laser beam to any direction defined by position-sensitive detectors. The system stabilizes the position in real-time, which means an active compensation for internal and external vibration sources as well as fast and automated correction of laser beam misalignment or pointing.

The systems make use of one or two pairs of Piezo-controlled mirror actuators and position-sensitive 4-quadrant or PSD diodes.

The beam stabilization system eliminates critical changes of laser beam direction due to vibration, mechanical shock, thermal drift, or other fluctuations of the laser output.