Production: adaptive optics - deformable mirror AT26.
Turn Ltd.
Deformable mirrors Control units  

Adaptive optics: deformable mirrors

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AT26, AT261/7, AT2611/7

Multychannel Deformable Mirrors

The Mirror AT26 is intended for improvement of the quality a different optical system with the aim of Multychannel dynamical control of:

  • wavefront shape,
  • divergence of a laser beam,
  • correction of atmospheric turbulence distortions, thermal and other nonstabilities in optical path.

Application regions:

  • astronomy and other high resolution vision devices,
  • correction of wavefront distortions in active laser media,
  • etc.

The mirror AT26 appearance.

The mirror AT26 appearance.

AT26 Segmentation layout intended for Zernike mode wavefront correction. Other variants of segmentation...



Technical Specification of AT26 variant

Substrate Material Optical fused silica
Reflecting Coating Multylayer dielectric, others – by the Customer order
Optical Aperture, mm 66
Protecting Coating by the Customer order
Number of Control Channels 20; may be changed by the Customer order
Control Voltage, V -300 ... +300
Sensitivity, microns/kV, no less 15
Hysteresis, %, no more 20
Frequency band, Hz, 0 - 500
Overall dimensions, mm

Interferograms of the mirror AT26 under control voltage.


Cooled Multichannel Deformable Mirror,
available for use in vacuum

Cooled Multichannel Deformable Mirror AT261/7 is intended for to control CO2 laser radiation wavefront shape.

The mirror body is made of Molybdenum. The Mirror driving performs with multichannel segmented piezostack. The Mirror substrate has a system of cooling channels implemented. The design and the enclosure permit to use the Mirror inside an evacuated volume under vacuum down to 10 Pa (10-4 bar).

The mirror enclosure variant AT2611/7 can be used as a part of an evacuated volume.

Mirror AT261/7 back side
Mirror AT261/7 appearance Mirror AT2611/7 back side


Parameter name, unit Normal Comments
Clear aperture diameter, mm,
- total
- cooled
- controlled part

Controlled diameter can be enlarged according the customer request up to cooled one
Reflectance of the coating under wavelength 10.6 micron and angle of incidence 00, %, no less 99 Coating can be changed according the customer request
Permissible laser radiation density load, kW/sm2 1 Expected value
Control channels Quantity 7  
Maximum stroke , micron, no less appropriate curvature range, 1/m -4...+6
Specified initial surface shape plane  
Class of cleanness of the surface (GOST 11141-84) IV  
Local error of the initial surface shape, interference fringes at wavelength 0.63 µm, no more 0.5  
Temperature dependence of initial surface shape, interference fringes at wavelength 0.63 µm/C0, no more 0.1  
Control voltages range, V -200...+300  
Capacitance of a channel, nF, no more 25  
Resistance of a channel, G, no less 1  
First resonance frequency, Hz, no less 4000  
Hysteresis, %, no more 20  
Nominal pressure of a coolant, bar 2.0  
Nominal flow rate of a coolant, l/min, no less 1.0  
Upper limit (test value) of control voltages
difference, V
- under atmosphere pressure of an air
- in vacuum 104...10 Pa

Upper limit (test value) of coolant pressure, bar 3.0  
Overall dimensions, mm, no more 70x45  
Weight, kg, no more 0.32  

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