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What is the precision of FrontSurfer wavefront sensor? |
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Wavefront sensors
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Typical configuration of the FrontSurfer wavefront sensor has a precision of about λ/60 PV (for λ=0.63 ?m) in the reference mode and about λ/6 PV in the absolute measurement mode. In the reference mode, the precision is mainly limited by the image sensornoise and can be improved by averaging over multiple frames and using a microlens array with larger focal distance. In the absolute measurement mode, the precision is limited by fabrication errors of the microlens array (or Hartmann mask). Please note that the precision is specified for low-order aberrations, when the sampling error can be neglected. It is important that the microlens array (or Hartmann mask) provide sufficient sampling for the aberrations to be measured. |
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Can you export outside Europe? |
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General
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According to the European export law, a license to export outside the EU should be obtained for any product that matches the definition:
"Deformable mirrors having either continuous or multi-element surfaces, and specially designed components therefor, capable of dynamically repositioning portions of the surface of the mirror at rates exceeding 100 Hz."
Export inside the EU is free from this restriction. Export to some selected destinations can be or can not be free from this restriction.
The banwidth of the mirrors exported withouth license to the destinations where the license should be obtained is limited to 100 Hz. |
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What is the stroke of a deformable mirror? |
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General
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There are two types of stroke defined for a deformable mirror — the maximum possible stroke and the maximum inter-actuator stroke. The former one characterises the maximum possible travel of a mirror surface when the maximum voltage is applied to all mirror actuators, the latter one describes the deformation when the maximum voltage is applied to a single actuator and zero voltage applied to all other actuators. The inter-actuator stroke is defined mainly by the actuator geometry and the membrane tension or the faceplate thickness. The maximum stroke for PDM is 6 μm at 300 V (or 8 μm at 400 V); for MMDM, it depends on the mirror size (about 9 μm for 15-mm mirrors and 18 µm for 50-mm mirrors).
For typical values of maximum and inter-actuator stroke of our mirrors, please refer to the Mirror Quick Guide. |
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Which camera can be used with FrontSurfer? |
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Wavefront sensors
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FrontSurfer can be interfaced with any camera or frame grabber, but it requires a special video plugin for FrontSurfer. Plugins for Picasso PCI-2SQM framegrabber from Arvoo, DFG/LC1 framegrabber from Imaging Source, A601f/A602f CMOS digital cameras from Basler and UI- 2210M/2410M from IDS Imaging are included in the distribution. Front-Surfer manual contains description of the functions that should be included in such a plugin, so that the user can develop his own plugin following these instructions. |
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What the FrontSurfer system can be applied for? |
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Wavefront sensors
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Applications include optical shop testing of transmissive and reflective optics, alignment of optical systems, real-time monitoring and active compensation of optical aberrations. |
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