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Acousto Optic X-Y Scanning System

Photonics MarketplaceTwo deflectors can be used in series and at right angles, to provide full two-dimensional (X,Y) scanning. The acousto-optic deflector is used to scan a laser beam over a range of angles, or to control the output angle of a laser beam with great accuracy. A Bragg configuration produces a single first order output beam, whose intensity is directly linked to the power of the RF control signal, and whose angle is directly linked to the RF frequency. By varying the frequency of the RF control signal, the angle of the output laser beam is adjusted.

An acousto-optic deflector is defined by the following parameters:
1) The range of the deflection angle, which is the maximum angle variation of the laser beam, is linked to the frequency range of the device.
2) The resolution of a deflector is the number of specific directions which can be addressed by the deflector. It is linked to the range of the deflection angle and the laser divergence.
3) The random access time.

A deflector is used to form a high number of "pixels" to scan laser beams. Single dimension Acousto-Optic Deflectors are also available. Acousto-optic deflectors require a variable frequency source able to cover a frequency range within 10MHz and 2GHz. EOPC offers several stock acousto-optic deflector drivers to choose from, as well as custom models.

Applications include generating graphics, compensation of tracking errors in rotating polygon mirrors, optical tweezers (to trap atoms or molecules), two and three dimensional measurements and cavity dumping (high power laser pulses switched out of a laser cavity).

Features and Advantages
  •  Two axis laser beam deflection
  •  High resolution
  •  Scanning mode/random access mode
  •  Wide spectral range/monochromatic mode
  •  Circular aperture up to 6.7 mm diameter
  •  Low drive RF power
  •  Optical transmission at least 95%
  •  Up to 50 MHz deflection frequency
  •  Up to 48 mrad deflection angle
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