General

As the most of our customers are universities or non-profit research organisations, we don’t have any special university discounts.

Standard 37-ch 15-mm mirror provides about 20000 nm of wavefront deformation for defocus. Third and fifth order aberrations with wavefront amplitudes of up to 3000 nm can be corrected. In general the dynamic 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 µm for a PDM.

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 standard coating for MMDM is aluminum, for PDM — aluminum or protected silver. Gold, protected silver and dielectric coatings (with a small number of coating layers) for MMDM and practically any coating for PDM are available by a special request — please don’t hesitate to ask us — just fill in the contact form on the left.

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 loads of up to 500 W and even 1 kW in some cases. Piezoelectric mirrors can be coated with high-power HR coatings, making them suitable for optical load of up to 1 kW and higher - in some special cases.

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 shape of the response functions depends on the mirror type (MMDM or PDM) and on the actuator structure. A very good approximation to the response functions for all of our mirrors can be calculated with the free version of MrFit.

The surface quality of all OKO mirrors is similar to any other solid reflective optics produced by leading manufacturers. It 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 400nm. OKO mirror with 37 channels and a diameter of 15mm will have less than 1 fringe of astigmatism averaged over a number of devices.

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. 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 19 and 37 channels will correct low order aberrations with relatively large amplitude.

Any regulated (DC 0…300V, 100mA) laboratory power supply will work. Good regulated 300V power supplies are produced by Delta Elektronika, postbus 27, 4300 AA Zierikzee, The Netherlands, tel. (0)111-413656, fax (0)11-416919. EMCO high-voltage DC to DC convertors F03 (F02 for lower voltage) can be used for portable applications. One module is needed for a 19-ch system, two modules will power a 37-ch system. In general, you will need one module per 20 channels.