Flexible Optical B.V. (OKO Technologies)

1. Special offer
(News/Latest news)

User-friendly closed loop AO systems including deformable mirror, mirror amplifiers, USB computer interface, Hartmann-Shack wavefront sensor  with microlens raster, USB camera and FrontSurfer software:  ...

2. 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 specied wavefront). It calculates the voltages to be applied to the ...

3. 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 ...

4. Which deformable mirror can be used with FrontSurfer?
(FAQs/Adaptive optical systems)

... from OKO Technologies - MMDM with up to 79 channels and PDM with up to 109 channels - or any custom mirror using the same controllers. Custom controllers can be interfaced to FrontSurfer using external ...

5. How good is the initial figure of OKO deformable mirrors?
(FAQs/General)

...  The initial figure of MMDM is flat with RMS deviation from the nearest reference plane better than 400nm. OKO mirror with 37 channels and a diameter of 15mm will have less than 1 fringe of astigmatism ...

6. How large can be the amplitude of the corrected aberrations?
(FAQs/General)

... range is higher for low spatial frequencies. The maximum profile difference between the adjacent actuators reaches 800 nm for MMDM and can be as large as 3 ?m for a PDM.  ...

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

... 37-ch MMDM provides high-quality correction of all 3-rd order aberrations and is reasonably good in correcting the 5-th order aberrations. 79-ch MMDM will correct aberrations up to 5th order. PDM with ...

8. Linear deformable mirrors
(Products/Wavefront correctors)

... and a 20 (40)-ch USB DAC unit (or a 24-ch 8-bit PCI DAC card) for interfacing to a PC. Full technical description can be downloaded here. Linear MMDM for pulse compression The linear membrane DM represents ...

9. What is the power handling ability of OKO DM?
(FAQs/General)

Standard 15mm Al-coated MMDM can handle up to 3 W optical load in the visible range. On a special order MMDM can be coated with a special HR metal-dielectric coatings, making them suitable for optical ...

10. How good is MMDM optically?
(FAQs/MMDMs)

The surface quality is good enough to work with very low scattering in the whole visible spectrum. The initial figure of MMDM is flat with RMS deviation from the nearest reference plane better than 250nm. ...

11. 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 ...

12. How linear is the MMDM response?
(FAQs/MMDMs)

... This formula provides linear correspondence between the control signal CS and the mirror displacement and sets the mirror into theoretical biased position when CS=0. MMDM features negligible hysteresis. ...

13. 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 ...

14. How to bias the MMDM?
(FAQs/MMDMs)

In the simplest case biasing can be achieved by applying a constant voltage to all actuators of the MMDM. Theoretically under the constant bias the MMDM should take a parabolic shape. In practice, MMDM ...

15. Is it possible to use MMDM for tilt correction (scanner mode)?
(FAQs/MMDMs)

The device can be specially calibrated to correct for tilts, preserving the diffraction-limited quality of the reflected beam in the range of about 25*lambda/D where lambda is the wavelength and D is the ...

16. 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 ...

17. What is MMDM?
(FAQs/MMDMs)

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

18. What is the use of MMDM?
(FAQs/MMDMs)

MMDM is used for fast correction of aberrations in optical systems. ...

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

... and telescopes: MMDM are small and light, especially compared to continuous faceplate piezoelectric mirrors; Negligible power consumption; High optical quality, better than 400nm rms over the ...

20. 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 ...