Flexible Optical B.V. (OKO Tech) is a small Dutch business operating in the field of research and application-oriented development of laser and high resolution imaging adaptive optics. From its foundation in 1997, OKO offers high-quality deformable mirrors featuring extremely smooth surface with HR metal and dielectric coatings suitable for most demanding imaging and high power laser applications.
Zernike Commander is a simple yet useful software tool suitable for education, real-time aberration visualization as well as for generation of test Hartmann image patterns. The software accepts an wavefront aberration described in the form of Zernike coefficients as well as parameters of Schack-Hartmann wavefront sensor as its input and produces the following graphical results: 3D representation of wavefront phase, interference pattern, far-field intensity distribution, Hartmann pattern, overview of Zernike modes.
OKO introduces a line of laser deformable mirrors (DM). These DMs feature highly reflective coatings with reflectivity of up to 99.998%, for the most frequently used laser wavelengths of 1060 nm, 530 nm, and any other wavelength in the range of 250 to 2500 nm. The standard DMs have light aperture of 30mm and 50mm, and can have 18,19 and 37 actuators (30 and 50mm diameter), and also 59, 69, 79 and 109 actuators (50mm diameter). Mirrors can work with continuous laser loads of up to tens of kW. The power handling ability is enchanced by active cooling of the mirror structure with embedded cooling fan.
In July 2013 OKO released the BeamDoctor system for the beam quality optimisation. The system is based on the BeamTuner software and can include any OKO deformable mirror. Using only the focal spot image, the software automatically, in a number of iterations, optimizes the control signals to the the deformable mirror, to compensate for the static aberration. The BeamTuner includes: The BeamTuner software, a deformable mirror with appropriate computer interface and drivers, and inexpensive CMOS or CCD camera for the focal spot sensor. The system also can be used to compensate aberrations of imaging systems, using real-time image sharpness as the optimization metric.
OKO extends the capabilities of modern imaging systems by introducing purely software-based system for image stabilization, object tracking, frame integration and multi-frame deconvolution. It offers an almost real time enhanced imaging through turbulent and wavy media. The system works with live video sequences fed via DirectShow (webcam) interface, or from a CMOS or CCD camera. To get the impression, please watch the recordings below, better seen in a full-frame mode. Feel free to contact us with any technical question, or for an offer. The basic configuration of the system is available from stock.
Direct control of Zernike modes is beneficial in feedforward control algorithms, and in optimization-based adaptive optics, such as laser intracavity AO, adaptive image sharpness control, smart PSF control in microscopy, optimal imaging through turbulence with stochastic optimization, etc. In all these cases the dynamic control of Zernike modes provides for very quick quasi-optimal convergence to the maximum value of the target function.
Here we show a 15 mm 37-channel OKO Micromachined Membrane Deformable Mirror (MMDM) and 30 mm 37-channel Piezoelectric Deformable Mirror (PDM) operated by Zernike polynomials in feedforward control mode. No wavefront sensor is used during the mirror operation. Both mirrors are controlled by our free MiZer software.