Flexible Optical B.V. (OKO Technologies)

1. What does "acceptable surface defects" mean?
(FAQs/MMDMs)

Making a membrane for MMDM is a complex process, and it's practically impossible to obtain membranes without any defect. These defects are the result of (dust) particles and are visible as small spots ...

2. 15 mm 37-ch "OKO Mirror"
(Products/MMDM)

... of the membrane is about 25 fringes at 633nm. In addition to standard silicon nitride-based mirrors, we produce mirrors with thicker polysilicon membrane, featuring higher reliability and snap-on prot ...

3. What is the stroke of a deformable mirror?
(FAQs/General)

... 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 ...

4. MrFit
(Products/Software)

MrFit is a program for simulation of membrane and continuous facesheet deformable mirrors ("Mr" means mirror and "Fit" means to fit a specified wavefront). It calculates the voltages to be applied to the ...

5. MrFit is out
(News/Latest news)

A free version of our Windows software for modeling of the response of membrane and piezoelectric deformable mirrors is available for download (Warning, the file size is ~150 MB!). MrFit is a program ...

6. Typical passports
(Products/Technology)

Here you can download typical technical passports for most of our products. General catalogue of OKO products (Product Guide) 37-ch 15-mm micromachined membrane DM 79-ch 50-mm micromachined membrane ...

7. How good the mirrors will correct our aberrations?
(FAQs/General)

Information about the spatial and temporal spectra of the aberrated wavefronts is required for a good answer to this question. Membrane mirrors in general are good in correcting smooth continuous aberrations. ...

8. Linear deformable mirrors
(Products/Wavefront correctors)

  OKO Tech produces membrane and piezoelectric DM for ultrafast pulse control. These mirrors are usually used in a stretcher for selective control of the delays of chosen spectral components. Linear ...

9. How large is MMDM?
(FAQs/MMDMs)

Standard OKO mirrors are circular with a diameter of 10mm and 15mm. We can custom develop devices of up to one inch in diameter and with various geometries of reflective membrane - we have experience with ...

10. How MMDM works?
(FAQs/MMDMs)

MMDM consists of a thin (500 to 700nm thick) membrane made of silicon nitride. The membrane is coated by a thin layer of aluminum or gold to produce a highly reflective surface. The membrane is fixed to ...

11. What is "biased operation"?
(FAQs/MMDMs)

The MMDM membrane can be deflected only in the direction of the electrode structure because the electrostatic force can be only attractive. This means the deflected membrane can produce only concave optical ...

12. What is MMDM?
(FAQs/MMDMs)

MMDM is "Micromachined membrane deformable mirror". ...

13. Micromachined Membrane Deformable Mirrors (MMDM)
(Products/Wavefront correctors)

Micromachined membrane deformable mirrors with apertures in the range of 10 to 50 mm, represent a high-quality affordable solution for the correction of dynamic wavefront deformations in laser systems ...

14. WF correctors
(Products/Wavefront correctors)

...  The systems we offer use Piezoelectric Deformable Mirrors (PDM) and Micromachined Membrane Deformable Mirrors (MMDM). FrontSurfer wavefront control system is used as a wavefront sensor and AO feedback ...

15. AO systems with MMDM
(Products/Complete AO systems)

AO systems with MMDM are based on our technology of Micromacined Membrane Deformable Mirrors. These mirrors are inexpensive and fast. They feature zero hysteresis and can work in a frequency range of up ...

16. Publications based on OKO products
(Products/Technology)

... a high quality correction of low-order aberrations using membrane, bimorph and continuous facesheet mirrors, these mirrors should have sufficient number of actuators positioned outside the correction aperture. ...

17. AO system overview
(Products/Complete AO systems)

... for published work based on our mirrors. We supply closed-loop AO systems based on Micromachined Membrane Deformable Mirrors (MMDM) with up to 79 channels and Piezoelectric Deformable Mirrors (PDM) with ...

18. High-voltage amplifier unit
(News/2006)

OKO introduces 20(40)-ch high-voltage amplifier units  for  membrane  and piezoelectric  deformable mirrors. Features small (40x200x280mm) size, active cooling, low  (20W)  ...