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June, 2010. ALPAO has designed a new adaptive optics system has been designed for correcting atmospheric turbulences. Based on ALPAO proprietary technologies, it consists in a large stroke deformable mirror having 277 actuators, a 16x16 wavefront sensor and the ALPAO Core Engine (control software).
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The main specifications of the Hi-Speed DM277-15 deformable mirror are summarized hereafter.
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Description |
Value |
Unit |
Clear aperture |
24.5 |
mm |
Number of actuators |
277 |
N/A |
Actuator stroke (3x3) |
>12 |
µm |
First mechanical resonance |
>800 |
Hz |
Non linearity errors |
<5 |
% |
Coating |
Silver protected |
N/A |
As this system has been built for laboratory experiment, a scientific CCD detector has been chosen (photon flux
arbitrarily
high). The system works in Fried's configuration (one micro-lens between two actuators).
Description |
Value |
Unit |
Beam size |
3.3 |
mm |
Number of micro-lenses |
16x16 |
N/A |
Tip/tilt dynamic |
30 lambda |
N/A |
Frame rate |
>100 |
Hz |
Read-out noise |
<10.0 |
electron RMS |
ADC |
12 |
bits |
Excellent dynamic performances are obtained using a standard off-the-shelf computer. Indeed, using the convenient MATLAB environment, the typical delay of 1.1 milli-second.
The three figures hereafter show hereafter the correction of turbulence generated by a phase plate. The right figure shows the dramatic increase of the encircled energy. |
Image obtained with a short exposure time (no A.O. correction) |
Image obtained with a long exposure time (no A.O. correction) |
Image obtained with a Long exposure time (with A.O. correction ) |
ASTRONOMY
FSO
VISION SCIENCE
MICROSCOPY
LASER
